AAID Associate Fellow Dental Implants Written Exam — Questions and Answers

Question 1: What is the primary mechanism by which Guided Bone Regeneration (GBR) achieves bone growth?

Delivering antibiotics directly to the surgical site
Increasing blood supply through vascular growth factors
Stimulating implant surface bioactivity
Using barrier membranes to exclude fast-proliferating soft tissue cells (Correct answer)

Correct answer: Using barrier membranes to exclude fast-proliferating soft tissue cells

GBR barrier membranes physically exclude fast-proliferating epithelial and fibroblastic cells from the bone defect, creating a protected space where slower-growing osteogenic cells can regenerate bone.

Question 2: Which measurement is most important when assessing the mesiodistal space for a single tooth implant?

Width of the edentulous space (Correct answer)
Root length of adjacent teeth
Distance between the CEJs of adjacent teeth
Height of the alveolar ridge

Correct answer: Width of the edentulous space

Adequate mesiodistal width (typically ≥7 mm for a standard implant) ensures proper implant placement without encroaching on adjacent tooth roots.

Question 3: Which implant diameter is typically classified as a 'narrow diameter implant' (NDI)?

3.5–4.5 mm
Less than 3.5 mm (Correct answer)
4.5–5.5 mm
Greater than 5.5 mm

Correct answer: Less than 3.5 mm

Narrow diameter implants are generally defined as those with a diameter less than 3.5 mm and are used in sites with limited bone width.

Question 4: Which post-operative instruction is most critical after implant surgery to prevent infection?

Applying heat packs immediately after surgery
Avoiding all oral hygiene for 2 weeks
Chlorhexidine rinse and prescribed antibiotics as directed (Correct answer)
Eating only on the surgical side to maintain blood supply

Correct answer: Chlorhexidine rinse and prescribed antibiotics as directed

Chlorhexidine rinse reduces bacterial load at the surgical site while antibiotics prevent post-operative infection during the critical early healing phase.

Question 5: What is the purpose of a 'pink porcelain' or 'pink acrylic' component in full-arch implant prostheses?

It reinforces the metal framework
It prevents bacterial plaque accumulation
It is a cosmetic choice only
It replaces lost gingival and bone tissue for esthetic and phonetic support (Correct answer)

Correct answer: It replaces lost gingival and bone tissue for esthetic and phonetic support

Pink prosthetic material mimics gum tissue to replace volumetric loss of soft and hard tissue that occurs after tooth loss and resorption.

Question 6: The 'stability dip' phenomenon during implant healing occurs because:

The crown is placed too early
The implant loosens due to infection
Bone grafts resorb before the implant integrates
Primary stability decreases before secondary stability fully develops during remodeling (Correct answer)

Correct answer: Primary stability decreases before secondary stability fully develops during remodeling

During early healing, bone remodeling reduces the initial mechanical grip (primary stability) before new bone formation (secondary stability) compensates — creating a temporary dip.

Question 7: Ridge splitting (ridge expansion) technique is used to treat:

Soft tissue deficiency
Sinus floor proximity
Horizontal knife-edge ridge deficiency (Correct answer)
Vertical bone deficiency

Correct answer: Horizontal knife-edge ridge deficiency

Ridge splitting expands a thin but tall alveolar ridge by splitting the cortical plates apart, allowing simultaneous or staged implant placement.

Question 8: Osseointegration was first scientifically described by which researcher?

Per-Ingvar Brånemark (Correct answer)
Carl Misch
Andre Schroeder
William Linkow

Correct answer: Per-Ingvar Brånemark

Professor Per-Ingvar Brånemark discovered osseointegration in the 1950s when titanium chambers could not be removed from rabbit bone, leading to modern implant dentistry.

Question 9: Which implant surface treatment is commonly used to enhance osseointegration?

Sand-blasting and acid-etching (SLA) (Correct answer)
Electropolishing
Gold plating
Teflon coating

Correct answer: Sand-blasting and acid-etching (SLA)

SLA (sand-blasted, large-grit, acid-etched) surfaces create micro-roughness that significantly improves bone cell attachment and osseointegration speed.

Question 10: What is the primary component of a dental implant that is surgically placed into the jawbone?

Fixture (implant body) (Correct answer)
Healing cap
Crown
Abutment

Correct answer: Fixture (implant body)

The fixture, or implant body, is the titanium screw-shaped post surgically embedded into the alveolar bone.

Question 11: The 'window of osseointegration' loading protocol means:

The implant must never be loaded before 1 year
Loading should occur after adequate osseointegration (typically 3–6 months) but before excessive fibrous integration (Correct answer)
Only provisional restorations are ever allowed on implants
Loading must occur within 24 hours

Correct answer: Loading should occur after adequate osseointegration (typically 3–6 months) but before excessive fibrous integration

Timing implant loading within the optimal window — after sufficient biological integration but before disuse atrophy — maximizes long-term success.

Question 12: Which of the following bone graft materials is classified as an alloplast?

Hydroxyapatite (Correct answer)
Demineralized freeze-dried bone allograft (DFDBA)
Bovine-derived bone mineral (Bio-Oss)
Iliac crest cancellous autograft

Correct answer: Hydroxyapatite

Alloplasts are synthetic or inorganic bone substitutes; hydroxyapatite is a common alloplast that mimics the mineral component of natural bone and functions as an osteoconductive scaffold.

Question 13: What is the purpose of micro-threads in the coronal portion of some implant designs?

Improve osseointegration at the apex
Preserve crestal bone by transferring functional stress (Correct answer)
Reduce insertion torque
Increase apical stability

Correct answer: Preserve crestal bone by transferring functional stress

Micro-threads at the implant neck help transfer functional stresses to the crestal bone, stimulating bone maintenance and reducing marginal bone loss.

Question 14: What is the primary goal of socket preservation (ridge preservation) performed immediately after tooth extraction?

To increase the width of keratinized gingival tissue
To treat pre-existing peri-apical infection at the extraction site
To minimize alveolar bone resorption following extraction (Correct answer)
To immediately place and stabilize a dental implant

Correct answer: To minimize alveolar bone resorption following extraction

Socket preservation using bone graft material placed immediately after extraction significantly reduces the natural dimensional changes (up to 50% width reduction) that occur in the alveolar ridge during the first 3-6 months post-extraction.

Question 15: Which intraoral donor site is most commonly used to harvest cortical block bone grafts for ridge augmentation?

Iliac crest
Zygomatic arch
Maxillary tuberosity
Mandibular symphysis or ramus (Correct answer)

Correct answer: Mandibular symphysis or ramus

The mandibular symphysis (chin area) and ramus are the preferred intraoral donor sites for cortical block grafts due to their dense cortical bone quality, proximity to the surgical site, and reduced resorption compared to cancellous sources.

Question 16: Which radiographic sign indicates successful osseointegration on a periapical radiograph?

Thin uniform radiolucent line around the implant
Dense opaque halo around the implant body
Direct contact between the implant threads and bone without radiolucency (Correct answer)
Visible radiolucency around the entire implant

Correct answer: Direct contact between the implant threads and bone without radiolucency

Successful osseointegration appears radiographically as direct crestal bone contact with the implant surface and absence of peri-implant radiolucency.

Question 17: In a two-stage implant protocol, the second-stage surgery involves:

Placing the implant fixture
Performing the bone graft
Cementing the final crown
Removing the cover screw and placing a healing abutment (Correct answer)

Correct answer: Removing the cover screw and placing a healing abutment

Second-stage surgery re-exposes the buried implant, removes the cover screw, and places a healing abutment to prepare the soft tissue for restoration.

Question 18: Which bone graft classification describes material derived from bovine or porcine bone that has been processed to remove organic components?

Allograft
Autograft
Alloplast
Xenograft (Correct answer)

Correct answer: Xenograft

Xenograft refers to bone graft material derived from a different species (e.g., bovine or porcine), which is deproteinized and deorganified to leave only the mineral scaffold for osteoconduction.

Question 19: Which material is most commonly used to manufacture dental implant fixtures in the US?

Gold alloy
Zirconia
Titanium (Correct answer)
Cobalt-chromium

Correct answer: Titanium

Titanium is the standard material due to its biocompatibility, strength, and ability to osseointegrate with bone.

Question 20: Which radiographic finding specifically indicates active peri-implantitis progression rather than stable remodeling?

Serial radiographic comparison showing progressive crestal bone loss over time (Correct answer)
Dense bone contact at all threads
Visible implant threads without shadows
Unchanged bone levels from initial placement

Correct answer: Serial radiographic comparison showing progressive crestal bone loss over time

Progressive bone loss detected by comparing sequential radiographs is the hallmark of active peri-implantitis rather than the initial 1–2 mm remodeling expected after placement.

Question 21: What is the primary benefit of incorporating platelet-rich fibrin (PRF) or platelet-rich plasma (PRP) into bone grafting procedures?

It eliminates the need for bone graft particulate material entirely
It provides a long-lasting osteoconductive scaffold for bone formation
It permanently replaces the need for barrier membranes in GBR
It concentrates autologous growth factors that may accelerate tissue healing (Correct answer)

Correct answer: It concentrates autologous growth factors that may accelerate tissue healing

PRF and PRP are prepared from the patient's own blood and concentrate growth factors such as PDGF, TGF-β, and VEGF; when used as adjuncts in grafting procedures, they may promote angiogenesis and accelerate graft healing and maturation.

Question 22: Which factor most significantly affects long-term implant success in the esthetic zone?

Crown material selection
Abutment torque value
Implant diameter
Preservation of inter-proximal papillae and labial bone (Correct answer)

Correct answer: Preservation of inter-proximal papillae and labial bone

Maintaining the inter-dental papilla and labial bony plate is critical for natural esthetics — black triangles and tissue collapse are primary esthetic failures.

Question 23: Which type of GBR membrane requires a planned second surgical procedure for removal?

Expanded polytetrafluoroethylene (e-PTFE) membrane (Correct answer)
Polylactic acid membrane
Polyglycolic acid membrane
Collagen membrane

Correct answer: Expanded polytetrafluoroethylene (e-PTFE) membrane

Non-resorbable e-PTFE (Gore-Tex) membranes provide superior space maintenance but must be surgically retrieved in a second procedure; collagen, polylactic acid, and polyglycolic acid membranes are all bioresorbable and degrade without additional surgery.

Question 24: The 'A-line' concept in full-arch implant planning refers to:

An antibiotic protocol line
The anticipated position of the restoration to guide implant angulation (Correct answer)
The alveolar nerve path
The attachment level of gingival tissue

Correct answer: The anticipated position of the restoration to guide implant angulation

Prosthetically driven planning uses the desired tooth position (A-line) to determine ideal implant angulation and placement, ensuring the restoration dictates surgery.

Question 25: The biologic width around a dental implant consists of:

Bone and overlying mucosa only
Junctional epithelium and connective tissue attachment forming the peri-implant seal (Correct answer)
Keratinized gingiva exclusively
Only the sulcular epithelium

Correct answer: Junctional epithelium and connective tissue attachment forming the peri-implant seal

The peri-implant biologic width includes the sulcular epithelium, junctional epithelium, and supracrestal connective tissue that protect the underlying bone.

Question 26: What does DFDBA stand for, and what is its primary property that distinguishes it from mineralized bone allograft?

Denatured freeze-dried bone alloplast; primarily osteoconductive due to mineral matrix
Demineralized freeze-dried bone allograft; primarily osteoinductive due to exposed BMPs (Correct answer)
Densified fresh-dried bone autograft; primarily osteogenic due to living cells
Demineralized fresh-dried bone allograft; primarily osteogenic due to preserved osteoblasts

Correct answer: Demineralized freeze-dried bone allograft; primarily osteoinductive due to exposed BMPs

DFDBA (Demineralized Freeze-Dried Bone Allograft) is processed to remove its mineral content, which exposes bone morphogenetic proteins (BMPs) and other growth factors embedded within the bone matrix, conferring significant osteoinductive properties in addition to its osteoconductive scaffold.

Question 27: Zirconia implants compared to titanium implants offer which primary advantage?

Superior osseointegration
Higher fracture resistance
Better esthetics in thin gingival biotypes (Correct answer)
Lower cost

Correct answer: Better esthetics in thin gingival biotypes

Zirconia's tooth-colored appearance eliminates the gray shadow sometimes visible through thin gum tissue, making it preferred for esthetic zones.

Question 28: Nerve injury (paresthesia) after mandibular implant placement is most often associated with:

Placing the implant too shallow
Using too large a diameter implant
Excessive irrigation during drilling
Implant placement too close to or into the inferior alveolar nerve canal (Correct answer)

Correct answer: Implant placement too close to or into the inferior alveolar nerve canal

The inferior alveolar nerve runs through the mandibular canal and can be compressed, stretched, or severed if the implant encroaches on this structure.

Question 29: An implant overdenture retained by locator attachments provides which primary advantage over a conventional full denture?

Does not require any maintenance
Eliminates all denture movement
Significantly improved retention and stability with minimal bone resorption prevention (Correct answer)
Functions identically to fixed implant restorations

Correct answer: Significantly improved retention and stability with minimal bone resorption prevention

Locator-retained overdentures dramatically improve retention and functional stability compared to conventional dentures while preserving remaining alveolar bone.

Question 30: Which type of bone defect is most favorable for successful bone regeneration using GBR techniques?

Horizontal dehiscence defects with no remaining bony walls
Infected extraction sockets with acute periapical pathology
Large through-and-through defects spanning more than 15 mm
Contained intrabony defects with multiple remaining bony walls (Correct answer)

Correct answer: Contained intrabony defects with multiple remaining bony walls

Contained intrabony defects with multiple remaining bony walls (three-wall or four-wall defects) are most favorable because the surrounding bone provides blood supply, osteogenic cells, and natural containment for regenerating bone, reducing the need for space maintenance.

Question 31: Which ASA classification represents a patient with well-controlled systemic disease and is generally considered a safe implant candidate?

ASA IV
ASA I
ASA II (Correct answer)
ASA III

Correct answer: ASA II

ASA II patients have mild systemic disease that is well-controlled, posing minimal additional surgical risk for implant procedures.

Question 32: An implant-supported fixed partial denture (implant bridge) requires at least how many implants per pontic to maintain appropriate force distribution?

Three implants regardless of span
One implant per pontic unit always
One implant total is sufficient
Ideally one implant per tooth replaced, but minimum one at each end (Correct answer)

Correct answer: Ideally one implant per tooth replaced, but minimum one at each end

Standard practice supports a bridge with at least one implant at each end of the span, though longer spans may require intermediate implants.

Question 33: A healing abutment (healing cap) is used primarily to:

Bond the abutment to the fixture
Prevent the implant from moving
Shape the peri-implant soft tissue during healing (Correct answer)
Permanently retain the crown

Correct answer: Shape the peri-implant soft tissue during healing

Healing abutments are placed after implant surgery to contour and guide the gingival tissue into the proper emergence profile.

Question 34: A screw loosening complication with an implant crown is most commonly caused by:

Insufficient torque or occlusal overload generating bending moments (Correct answer)
Implant placed too deep in bone
Poor oral hygiene around the implant
Using titanium abutment screws

Correct answer: Insufficient torque or occlusal overload generating bending moments

Inadequate tightening torque or excessive occlusal forces — especially lateral interferences — are the most common causes of abutment or retaining screw loosening.

Question 35: The passive fit of an implant framework means:

It requires spring-loaded attachments
It uses soft acrylic for comfort
The framework has slight flexion under load
The framework seats on all implants simultaneously without introducing internal stress (Correct answer)

Correct answer: The framework seats on all implants simultaneously without introducing internal stress

A passively fitting framework contacts all implants simultaneously without pre-loading any implant or abutment — internal stress causes screw fracture and bone loss.

Question 36: A patient's keratinized tissue width around an implant site should ideally be at least:

10 mm
6 mm
0.5 mm
2 mm (Correct answer)

Correct answer: 2 mm

At least 2 mm of keratinized tissue around implants helps resist recession, facilitates hygiene, and improves long-term peri-implant health.

Question 37: Implant survival rate at 10 years in healthy patients with proper maintenance is approximately:

99–100%
90–95% (Correct answer)
70–75%
50–60%

Correct answer: 90–95%

Well-documented long-term studies show dental implant 10-year survival rates of 90–95% in healthy patients with regular maintenance, making them a highly predictable treatment.

Question 38: How is distraction osteogenesis applied in ridge augmentation for dental implants?

Surgically dividing bone and gradually separating the segments to stimulate new bone formation in the gap (Correct answer)
Rapidly expanding the ridge using hydraulic pressure over 48 hours
Chemically dissolving and reconstituting bone in a controlled environment
Compressing bone segments together to increase density around an implant

Correct answer: Surgically dividing bone and gradually separating the segments to stimulate new bone formation in the gap

Distraction osteogenesis involves a corticotomy to divide bone, followed by a latency period and then gradual mechanical separation (distraction) of the segments, stimulating new bone (callus) formation in the expanding gap for vertical or horizontal ridge augmentation.

Question 39: What is the function of the implant cover screw?

Holds the abutment in place
Attaches the crown permanently
Seals the implant during submerged healing (Correct answer)
Prevents infection post-surgery

Correct answer: Seals the implant during submerged healing

The cover screw closes the implant fixture during the submerged (two-stage) healing protocol to protect the internal connection.

Question 40: In the context of simultaneous implant placement with bone grafting, what does 'primary stability' refer to?

The initial mechanical anchorage of the implant achieved through bone compression at the time of placement (Correct answer)
The chemical bond between alloplast graft material and the titanium implant surface
The stability of the GBR membrane during the bone healing period
The biological bond between the implant surface and new bone after osseointegration is complete

Correct answer: The initial mechanical anchorage of the implant achieved through bone compression at the time of placement

Primary stability refers to the initial mechanical retention of the implant in bone achieved at the time of surgical placement through friction and compression; it is critical when grafting simultaneously with implant insertion to ensure the implant remains immobile during the healing period.

Question 41: What is the recommended torque value range for tightening most implant abutment screws?

15–35 Ncm (Correct answer)
5–10 Ncm
50–70 Ncm
80–100 Ncm

Correct answer: 15–35 Ncm

Most manufacturers recommend abutment screw torque of 15–35 Ncm to ensure proper seating without stripping or fatigue fracture.

Question 42: What does 'platform switching' refer to in implant dentistry?

Moving the implant to a different jaw position
Using a narrower abutment diameter than the implant platform diameter (Correct answer)
Changing the implant platform brand
Switching from titanium to zirconia abutments

Correct answer: Using a narrower abutment diameter than the implant platform diameter

Platform switching uses an abutment with a smaller diameter than the implant platform to shift the microgap inward and preserve crestal bone.

Question 43: Which instrument is safest to use for calculus removal around titanium implants to avoid scratching the surface?

Metal ultrasonic scaler tip
Stainless steel curette
Plastic, carbon fiber, or titanium-specific curettes (Correct answer)
Diamond-coated burs

Correct answer: Plastic, carbon fiber, or titanium-specific curettes

Non-metallic or implant-specific instruments prevent scratching the titanium surface, which creates rough areas that increase bacterial adhesion and accelerate peri-implantitis.

Question 44: Which bone classification (Lekholm & Zarb) describes dense cortical bone with little trabecular bone, typically found in the anterior mandible?

Type IV
Type I (Correct answer)
Type II
Type III

Correct answer: Type I

Type I bone is almost entirely dense cortical bone, providing excellent primary stability but potentially limiting blood supply to the implant surface.

Question 45: Immediate implant placement (Type 1) means the implant is placed:

After complete bone fill of the socket
After full soft tissue healing
Immediately at time of tooth extraction (Correct answer)
8 weeks after extraction

Correct answer: Immediately at time of tooth extraction

Type 1 (immediate) placement occurs on the same day as extraction into the fresh socket, reducing total treatment time.

Question 46: Bisphosphonate use is a significant concern for implant patients because it can cause:

Implant rejection
Excessive bone overgrowth around implants
Medication-related osteonecrosis of the jaw (MRONJ) (Correct answer)
Implant corrosion

Correct answer: Medication-related osteonecrosis of the jaw (MRONJ)

Bisphosphonates suppress bone turnover and can lead to MRONJ, particularly after dentoalveolar surgery including implant placement.

Question 47: Late implant failure is most commonly associated with:

Abutment screw loosening only
Surgical trauma during placement
Anesthesia reactions
Peri-implantitis and cumulative bone loss over time (Correct answer)

Correct answer: Peri-implantitis and cumulative bone loss over time

Late failures typically result from progressive peri-implant bone loss due to peri-implantitis, occlusal overload, or systemic disease progression.

Question 48: What is the standard activation rate used for bone distractors in vertical ridge augmentation procedures?

5 mm per week
0.5 mm per week
1 mm per day (Correct answer)
2 mm per day

Correct answer: 1 mm per day

The standard distraction rate is approximately 1 mm per day (typically in two 0.5 mm activations per day), which matches the rate of natural bone callus formation; faster rates result in fibrous tissue rather than bone, while slower rates cause premature consolidation.

Question 49: After a lateral window sinus lift, the window site is typically covered with:

Petroleum gauze
Zinc oxide eugenol dressing
A resorbable collagen membrane (Correct answer)
Zinc phosphate cement

Correct answer: A resorbable collagen membrane

A resorbable collagen membrane is placed over the lateral window to contain the graft, support blood clot formation, and facilitate new bone formation.

Question 50: The 'jumping distance' in immediate implant placement refers to:

The distance between adjacent implants
The gap between the implant surface and the socket wall (Correct answer)
The bone height gained from grafting
The depth the implant extends beyond the socket apex

Correct answer: The gap between the implant surface and the socket wall

The jumping distance is the horizontal gap between the implant body and the buccal/lingual socket walls, which must be filled with graft material.

Question 51: Lateral window sinus augmentation (Caldwell-Luc approach) is typically indicated when residual bone height is:

Less than 4–5 mm (Correct answer)
Greater than 12 mm
8–10 mm
4–6 mm

Correct answer: Less than 4–5 mm

When less than 4–5 mm of subantral bone remains, a lateral window approach is needed to place adequate graft material before or during implant placement.

Question 52: Occlusal overload in implant-supported restorations can lead to:

Faster osseointegration
Improved implant stability
Reduced infection risk
Crestal bone loss and implant failure (Correct answer)

Correct answer: Crestal bone loss and implant failure

Excessive occlusal forces exceed the bone-implant interface's tolerance, causing microfractures, bone resorption, and ultimately implant failure.

Question 53: Immediate loading of a dental implant requires a minimum insertion torque of at least:

70 Ncm
5 Ncm
35 Ncm (Correct answer)
10 Ncm

Correct answer: 35 Ncm

A minimum insertion torque of 35 Ncm is generally required to ensure sufficient primary stability to withstand functional loading without implant micro-movement.

Question 54: Retrograde peri-implantitis (implant periapical lesion) occurs when:

Abutment screws loosen repeatedly
The crown is placed before osseointegration
Infection from the surgical site or residual pathology affects the periapical region of the implant (Correct answer)
Bone loss progresses apically from the crest

Correct answer: Infection from the surgical site or residual pathology affects the periapical region of the implant

Retrograde peri-implantitis presents as a periapical lesion around an otherwise well-integrated implant, often from residual infection, overheated bone, or contamination during surgery.

Question 55: Guided bone regeneration (GBR) uses a membrane primarily to:

Deliver growth factors to the site
Stabilize the implant position
Exclude epithelial and connective tissue cells while allowing bone progenitor cells to repopulate the defect (Correct answer)
Provide structural bone volume

Correct answer: Exclude epithelial and connective tissue cells while allowing bone progenitor cells to repopulate the defect

GBR membranes act as a physical barrier, preventing fast-growing soft tissue from occupying the defect space and allowing slower-growing osteogenic cells to fill it.

Question 56: A Morse taper implant-abutment connection is characterized by:

A screw retained connection only
A butt-joint flat connection
A friction-fit conical connection (Correct answer)
An external hex design

Correct answer: A friction-fit conical connection

Morse taper connections use a conical friction-fit interface that provides strong mechanical stability and reduces micro-movement at the junction.

Question 57: Hyperbaric oxygen (HBO) therapy in implant dentistry may be used to:

Speed up routine osseointegration in healthy patients
Sterilize the implant surface pre-surgically
Prevent peri-implantitis after restoration
Enhance healing in previously irradiated bone or compromised healing sites (Correct answer)

Correct answer: Enhance healing in previously irradiated bone or compromised healing sites

HBO therapy increases tissue oxygen tension, promoting angiogenesis and osteogenesis in hypoxic, irradiated, or poorly vascularized bone environments.

Question 58: What is the 'tent pole' effect in Guided Bone Regeneration (GBR)?

The phenomenon of new bone growing through perforations in the membrane
A complication where the membrane collapses into the bone defect
Creating and maintaining space under a membrane using rigid supports such as pins or titanium mesh (Correct answer)
Using implants themselves to anchor and support the overlying membrane

Correct answer: Creating and maintaining space under a membrane using rigid supports such as pins or titanium mesh

The tent pole effect refers to the technique of using titanium screws, pins, or mesh to mechanically support and maintain the volume of space beneath a GBR membrane, preventing membrane collapse into the defect and ensuring adequate room for bone regeneration.

Question 59: What is the primary indication for the ridge splitting (ridge expansion) technique in implant dentistry?

Creating soft tissue volume for aesthetic implant emergence profiles
Widening a narrow but adequately tall alveolar ridge to accommodate an implant (Correct answer)
Increasing vertical bone height in the atrophic posterior maxilla
Treating active peri-implantitis around existing implants

Correct answer: Widening a narrow but adequately tall alveolar ridge to accommodate an implant

Ridge splitting uses chisels or piezoelectric devices to create a greenstick fracture in a narrow ridge, expanding the cortical plates to create width for simultaneous implant placement and bone grafting while maintaining the native ridge height.

Question 60: What is the abutment's role in a dental implant system?

It prevents infection during healing
It connects the implant fixture to the prosthetic crown (Correct answer)
It stimulates bone growth
It anchors into the jawbone

Correct answer: It connects the implant fixture to the prosthetic crown

The abutment is the connector piece that attaches to the implant fixture and supports the final crown or prosthesis.

Question 61: The most effective method for decontaminating an implant surface during peri-implantitis surgery is:

Mechanical debridement combined with chemical decontamination (saline, citric acid, or chlorhexidine) (Correct answer)
Applying hydrogen peroxide at full concentration
Sandblasting the implant surface intraorally
High-speed air polishing with sodium bicarbonate only

Correct answer: Mechanical debridement combined with chemical decontamination (saline, citric acid, or chlorhexidine)

Combining mechanical debridement with chemical surface decontamination reduces the biofilm to levels that allow re-osseointegration or stable healing.

Question 62: The diagnostic wax-up or digital smile design in implant planning primarily helps to:

Measure osseointegration progress
Calculate implant diameter
Determine bone density
Visualize the final esthetic outcome and guide surgical stent fabrication (Correct answer)

Correct answer: Visualize the final esthetic outcome and guide surgical stent fabrication

A diagnostic wax-up simulates the final restoration to communicate esthetics with the patient and create a surgical guide.

Question 63: Piezoelectric surgery (piezosurgery) during implant site preparation offers the advantage of:

Providing better implant primary stability
Selective cutting of mineralized tissue while sparing soft tissue (Correct answer)
Faster drilling speed
Generating less irrigation need

Correct answer: Selective cutting of mineralized tissue while sparing soft tissue

Ultrasonic piezo devices cut bone with minimal heat and vibration while avoiding laceration of nerves, vessels, and the sinus membrane.

Question 64: Aspiration or swallowing of a dental implant component during prosthetic procedures requires:

Immediate patient assessment with appropriate imaging and medical consultation if respiratory compromise (Correct answer)
Immediate emergency surgical removal always
Only monitoring for digestive symptoms
No action — small metal pieces pass harmlessly

Correct answer: Immediate patient assessment with appropriate imaging and medical consultation if respiratory compromise

Aspirated components that enter the airway are a medical emergency requiring immediate chest X-ray and possible bronchoscopy; swallowed components typically pass but must be confirmed.

Question 65: What is the primary purpose of sequential drilling (drill protocol) during implant osteotomy preparation?

To create a rough bone surface
To remove all cortical bone
To stimulate bleeding for healing
To incrementally enlarge the osteotomy while minimizing heat generation (Correct answer)

Correct answer: To incrementally enlarge the osteotomy while minimizing heat generation

Sequential drilling gradually widens the site to the final diameter while controlling bone temperature and preventing thermal necrosis.

Question 66: Which process best describes osteoinduction in bone grafting?

Remodeling of mature lamellar bone after graft placement
Physical scaffold provided for osteoblast attachment
Stimulation of undifferentiated mesenchymal cells to become bone-forming cells (Correct answer)
Direct bone formation from transplanted living osteoblasts

Correct answer: Stimulation of undifferentiated mesenchymal cells to become bone-forming cells

Osteoinduction is the process by which signaling molecules (particularly BMPs) stimulate undifferentiated mesenchymal stem cells to differentiate into osteoblasts, initiating de novo bone formation in non-osseous tissue.

Question 67: Uncontrolled Type 2 diabetes is considered a relative contraindication for dental implants primarily because:

It impairs immune response and wound healing, increasing failure risk (Correct answer)
High glucose destroys titanium implants
It causes teeth to fall out faster
Diabetic patients cannot tolerate anesthesia

Correct answer: It impairs immune response and wound healing, increasing failure risk

Elevated HbA1c levels correlate with impaired osseointegration, increased infection risk, and delayed healing around implants.

Question 68: Antibiotic prophylaxis before dental implant surgery is commonly recommended for:

Only patients with cardiac conditions
All patients regardless of health status
No patients — antibiotics cause implant failure
Systemically compromised patients and per surgeon protocol, typically amoxicillin 2g one hour before (Correct answer)

Correct answer: Systemically compromised patients and per surgeon protocol, typically amoxicillin 2g one hour before

While evidence varies, many surgeons use prophylactic amoxicillin 2g pre-operatively for at-risk patients following ADA/AAOS guidelines to reduce infection risk.

Question 69: Implant-retained restorations require patients to use which hygiene aid most specifically designed for implant maintenance?

Standard dental floss only
Electric toothbrush with firm bristles
Interdental brushes and water flossers/irrigators (Correct answer)
Whitening toothpaste

Correct answer: Interdental brushes and water flossers/irrigators

Interdental brushes and water irrigators effectively clean around implant abutments and under implant bridges where standard floss cannot reach.

Question 70: What is the minimum residual bone height above the mandibular canal recommended before implant placement in the posterior mandible?

1 mm
10 mm
2 mm (Correct answer)
5 mm

Correct answer: 2 mm

A minimum of 2 mm safety margin above the inferior alveolar nerve canal is required to prevent nerve injury during implant placement.

Question 71: The first-line treatment for peri-implant mucositis is:

Professional debridement combined with patient oral hygiene instruction (Correct answer)
Implant removal
Systemic antibiotics alone
Surgical bone regeneration

Correct answer: Professional debridement combined with patient oral hygiene instruction

Since mucositis is biofilm-induced and reversible, professional cleaning around the implant combined with excellent home hygiene consistently resolves it.

Question 72: The Schneiderian membrane must be carefully elevated and preserved during which dental implant procedure?

Ridge splitting for horizontal augmentation
Maxillary sinus augmentation (Correct answer)
Guided bone regeneration at extraction sites
Mandibular nerve transposition

Correct answer: Maxillary sinus augmentation

The Schneiderian membrane is the mucoperiosteal lining of the maxillary sinus; it must be elevated intact during sinus augmentation to create a space below the sinus floor for bone graft material without causing perforation.

Question 73: Which term describes the property of a graft material that provides a scaffold along which host bone cells can migrate and form new bone?

Osteoconduction (Correct answer)
Osteogenesis
Osseointegration
Osteoinduction

Correct answer: Osteoconduction

Osteoconduction refers to the scaffold property of graft material that provides a physical framework for host osteoblasts and vascular tissue to migrate into and form new bone along its surface.

Question 74: Which flap design in implant surgery minimizes damage to the blood supply and preserves interdental papillae?

Papilla-sparing (papilla preservation) incision (Correct answer)
Full-thickness trapezoidal flap
Crestal split-thickness flap
Envelope flap without vertical releasing incisions

Correct answer: Papilla-sparing (papilla preservation) incision

Papilla-sparing incision designs avoid cutting through the papillae, preserving their blood supply and reducing esthetic complications.

Question 75: What term describes bone graft material that is derived from human cadaveric donors and processed for clinical use?

Alloplast
Allograft (Correct answer)
Xenograft
Autograft

Correct answer: Allograft

Allograft refers to bone graft material obtained from human donors, which undergoes processing (freeze-drying, demineralization, sterilization) to eliminate immunogenicity while preserving its scaffolding and osteoinductive properties.

Question 76: A provisional (temporary) implant restoration during osseointegration should be:

Always avoided — no restoration until final crown
A permanent acrylic crown cemented definitively
Out of occlusion or in minimal occlusal contact to avoid disturbing integration (Correct answer)
In heavy occlusal contact to stimulate bone healing

Correct answer: Out of occlusion or in minimal occlusal contact to avoid disturbing integration

Provisional restorations must be relieved from occlusal contact to prevent functional forces from causing micro-movement during the critical osseointegration period.

Question 77: A cemented crown on an implant compared to a screw-retained crown has which notable disadvantage?

Difficulty retrieving excess cement that can cause peri-implantitis (Correct answer)
Cannot be used in the posterior region
Higher fracture risk of the crown
Lower esthetic outcome

Correct answer: Difficulty retrieving excess cement that can cause peri-implantitis

Excess cement extruded subgingivally during cementation can cause peri-implant inflammation and bone loss if not completely removed.

Question 78: Growth factors contained in platelet-rich fibrin (PRF) that enhance implant site healing include:

Cortisol and epinephrine
TNF-alpha and IL-6
Histamine and bradykinin
PDGF, TGF-beta, and VEGF (Correct answer)

Correct answer: PDGF, TGF-beta, and VEGF

PRF releases platelet-derived growth factor (PDGF), transforming growth factor-beta (TGF-β), and vascular endothelial growth factor (VEGF) to accelerate healing and angiogenesis.

Question 79: Inter-arch space (restorative space) of at least how much is typically required for an implant-supported crown?

8–12 mm
5–7 mm (Correct answer)
15 mm
2–3 mm

Correct answer: 5–7 mm

A minimum of 5–7 mm of vertical restorative space is needed to accommodate the abutment height plus the crown material.

Question 80: Which impression technique captures the three-dimensional position of implants in the mouth using a tray that remains in the mouth during cast separation?

Closed-tray impression
Alginate irreversible hydrocolloid technique
Bite registration technique
Open-tray (pick-up) impression (Correct answer)

Correct answer: Open-tray (pick-up) impression

Open-tray (pick-up) impressions transfer impression copings out with the tray, providing more accurate positional transfer especially for multiple implants.

Question 81: Fibro-osseous integration (as opposed to osseointegration) is considered a failure because:

It is too rigid and causes bone fractures
It causes excessive bone growth around the implant
A fibrous tissue layer at the interface lacks mechanical stability and is prone to breakdown (Correct answer)
The implant fuses permanently and cannot be removed

Correct answer: A fibrous tissue layer at the interface lacks mechanical stability and is prone to breakdown

Fibrous encapsulation creates a weak, mobile interface similar to a non-union fracture — the implant may feel firm initially but typically fails under functional loading.

Question 82: The 'pink esthetic score' (PES) and 'white esthetic score' (WES) are used to evaluate:

Bone density measurement outcomes
Patient satisfaction with implant treatment
Shade matching in posterior implants
Soft tissue and crown esthetics respectively around anterior implant restorations (Correct answer)

Correct answer: Soft tissue and crown esthetics respectively around anterior implant restorations

PES evaluates peri-implant soft tissue esthetics while WES assesses the visible crown esthetics — together they provide a comprehensive esthetic outcome score.

Question 83: Primary stability (initial stability) during implant placement is primarily determined by:

Healing time protocol
Implant surface coating
Bone-to-implant contact achieved at time of surgery (Correct answer)
Abutment design

Correct answer: Bone-to-implant contact achieved at time of surgery

Primary stability refers to the mechanical engagement of the implant with bone at time of placement, measured by insertion torque and resonance frequency analysis.

Question 84: Maxillary anterior single implant esthetic failures are most commonly caused by:

Using zirconia instead of porcelain fused to metal
Labial bone loss and gingival recession exposing the implant or metal collar (Correct answer)
Over-tightening the abutment screw
Incorrect shade matching of the crown

Correct answer: Labial bone loss and gingival recession exposing the implant or metal collar

Loss of the thin labial plate of bone leads to gingival recession, exposing the implant shoulder or creating asymmetrical gum levels that compromise esthetics.

Question 85: The emergence profile of an implant crown refers to:

The height of the crown above the gum
The contour of the restoration as it emerges from the gum tissue (Correct answer)
The shade of the porcelain used
The angle of the implant in the bone

Correct answer: The contour of the restoration as it emerges from the gum tissue

The emergence profile is the three-dimensional transition between the implant abutment and crown as it exits the peri-implant sulcus, affecting esthetics and hygiene access.

Question 86: Which cell type is primarily responsible for new bone apposition on the implant surface during osseointegration?

Osteoblasts (Correct answer)
Osteoclasts
Neutrophils
Fibroblasts

Correct answer: Osteoblasts

Osteoblasts are bone-forming cells that migrate to the implant surface and deposit osteoid matrix that eventually mineralizes into bone.

Question 87: Which systemic condition most severely impairs osseointegration by reducing osteoblast function?

Osteoporosis (Correct answer)
Well-managed hypothyroidism
Controlled hypertension
Controlled asthma

Correct answer: Osteoporosis

Osteoporosis reduces bone density and osteoblast activity, potentially compromising bone-to-implant contact and increasing fracture risk around implants.

Question 88: Bone temperature should not exceed which threshold during implant drilling to prevent thermal osteonecrosis?

47°C (Correct answer)
37°C
55°C
42°C

Correct answer: 47°C

Sustained bone temperatures above 47°C for more than 1 minute cause osteonecrosis, which can prevent osseointegration and lead to implant failure.

Question 89: The macro-design feature of implant threads primarily serves to:

Increase initial stability and distribute occlusal load (Correct answer)
Prevent infection
Improve esthetics
Reduce surgical time

Correct answer: Increase initial stability and distribute occlusal load

Thread design affects primary stability and load distribution; aggressive threads provide better purchase in softer bone types.

Question 90: Smoking affects dental implant outcomes by:

Reducing implant survival rates and increasing peri-implantitis risk (Correct answer)
Accelerating osseointegration
Having no significant effect on outcomes
Improving blood supply to the site

Correct answer: Reducing implant survival rates and increasing peri-implantitis risk

Smoking reduces vascularity, impairs immune function, and increases bacterial colonization, significantly raising implant failure and peri-implantitis rates.

Question 91: When peri-implantitis has caused significant bone loss, which treatment approach aims to regenerate lost bone?

Surgical debridement with guided bone regeneration (resective or regenerative surgery) (Correct answer)
Implant removal immediately
Increasing the implant crown height
Antibiotics alone without surgery

Correct answer: Surgical debridement with guided bone regeneration (resective or regenerative surgery)

Surgical access allows thorough decontamination of the implant surface followed by bone grafting and GBR to attempt to regenerate the lost supporting bone.

Question 92: Implant fracture is most commonly associated with:

Overheating during placement
Small diameter implants under excessive occlusal load or in bruxers (Correct answer)
Using cemented vs. screw-retained crowns
Deep implant placement

Correct answer: Small diameter implants under excessive occlusal load or in bruxers

Narrow diameter implants subjected to heavy parafunctional forces or occlusal overload are at highest risk of fatigue fracture through the implant body.

Question 93: Stress shielding around dental implants refers to:

The implant preventing occlusal forces from reaching the sinus
Reduced bone stimulation in areas shielded from occlusal load, leading to bone resorption (Correct answer)
Protective effect of implants on adjacent teeth
Cortical bone protecting the implant from micromovement

Correct answer: Reduced bone stimulation in areas shielded from occlusal load, leading to bone resorption

Areas of bone not receiving adequate functional stimulation due to the stiffness of the implant (stress shielding) undergo disuse atrophy and resorption.

Question 94: A patient with bruxism seeking dental implants should be informed that:

A night guard is recommended to protect implants from parafunctional forces (Correct answer)
Implant crowns cannot be used — only removable options
Implants are contraindicated in bruxers
Bruxism actually improves osseointegration through stimulation

Correct answer: A night guard is recommended to protect implants from parafunctional forces

A custom occlusal night guard reduces parafunctional forces on implant restorations, decreasing fracture and bone loss risk in bruxing patients.

Question 95: Pre-implant orthodontic treatment may be needed to:

Speed up osseointegration post-surgery
Increase bone density
Eliminate the need for bone grafting
Create adequate mesiodistal space and align adjacent roots (Correct answer)

Correct answer: Create adequate mesiodistal space and align adjacent roots

Orthodontics can upright tipped adjacent teeth and open collapsed spaces to provide the necessary room and favorable root angulation for implant placement.

Question 96: Early (premature) implant failure is defined as failure occurring:

Before or shortly after loading, typically within the first year (Correct answer)
After 5 years of loading
Only in systemically compromised patients
During the surgical procedure only

Correct answer: Before or shortly after loading, typically within the first year

Early failure occurs before functional osseointegration is established or shortly after loading, usually due to infection, overload, or inadequate bone quality.

Question 97: Which sinus augmentation approach is preferred when residual alveolar bone height in the posterior maxilla is less than 4 mm?

Lateral window (Caldwell-Luc) approach (Correct answer)
Distraction osteogenesis
Osteotome (crestal) technique
Ridge expansion technique

Correct answer: Lateral window (Caldwell-Luc) approach

The lateral window approach is preferred when residual bone height is less than 4-5 mm because it provides direct visualization and access to safely elevate the Schneiderian membrane and place adequate graft volume; the osteotome technique requires at least 5-6 mm of native bone for implant primary stability.

Question 98: Peri-implant mucositis is best described as:

Irreversible bone loss around an implant
Reversible inflammation limited to the soft tissue around an implant without bone loss (Correct answer)
Infection of the surgical site only
Complete implant failure

Correct answer: Reversible inflammation limited to the soft tissue around an implant without bone loss

Peri-implant mucositis is the implant equivalent of gingivitis — reversible soft tissue inflammation without bone loss that responds to improved oral hygiene.

Question 99: What distinguishes a one-piece implant from a two-piece implant system?

Diameter of the implant
Material composition
Number of threads on the body
The abutment is integrated into the fixture with no separate component (Correct answer)

Correct answer: The abutment is integrated into the fixture with no separate component

One-piece implants combine the fixture and abutment in a single unit, eliminating the micro-gap at the connection but limiting prosthetic versatility.

Question 100: The screw access channel in a screw-retained implant crown is typically sealed with:

Zinc oxide eugenol cement
Polytetrafluoroethylene (PTFE) tape and composite (Correct answer)
Glass ionomer cement only
Permanent composite resin

Correct answer: Polytetrafluoroethylene (PTFE) tape and composite

PTFE tape placed below a composite resin plug allows the access channel to be opened for retrieval while protecting the screw head.

Question 101: The recommended maintenance recall interval for implant patients after the first year of loading is typically:

Every 5 years
Monthly for the first 10 years
Annually only if asymptomatic
Every 3–6 months depending on risk factors (Correct answer)

Correct answer: Every 3–6 months depending on risk factors

Implant maintenance every 3–6 months allows early detection of peri-implant disease, mechanical complications, and ensures continued patient hygiene compliance.

Question 102: Cantilever extensions on implant-supported fixed prostheses should be limited to reduce:

Implant diameter requirements
Bending moments and stress concentration at the most distal implant (Correct answer)
Number of implants needed
Esthetic concerns

Correct answer: Bending moments and stress concentration at the most distal implant

Cantilever length creates bending stress that multiplies at the distal implant; excessive cantilevers can cause screw loosening, fracture, and bone loss.

Question 103: The McGill consensus (2002) recommended that the minimum standard of care for edentulous mandibular patients should be:

Conventional complete denture alone
A full arch fixed implant bridge
A two-implant retained mandibular overdenture (Correct answer)
A four-implant overdenture

Correct answer: A two-implant retained mandibular overdenture

The McGill and York consensus statements established that a two-implant mandibular overdenture should be the minimum standard for edentulous patients.

Question 104: The implant collar (also called the neck) refers to:

The threaded middle section
The internal connection socket
The apical tip of the implant
The coronal smooth portion just below the platform (Correct answer)

Correct answer: The coronal smooth portion just below the platform

The implant collar is the smooth or micro-threaded coronal section that interfaces with crestal bone and soft tissue.

Question 105: Resonance frequency analysis (RFA) measures implant stability using the unit:

Implant stability quotient (ISQ) (Correct answer)
Newton centimeters (Ncm)
Millimeters (mm)
Hounsfield units (HU)

Correct answer: Implant stability quotient (ISQ)

RFA measures implant stability on an ISQ scale from 1–100; higher values indicate greater stiffness and primary stability.

Question 106: The 'tent pole' technique using implants or titanium mesh in ridge augmentation is designed to:

Speed up osseointegration
Create and maintain a protected space for bone regeneration (Correct answer)
Increase primary implant stability
Reduce need for membrane use

Correct answer: Create and maintain a protected space for bone regeneration

Rigid titanium mesh or implants tent the membrane to prevent collapse into the defect, maintaining the space needed for new bone formation.

Question 107: Which type of implant connection features a six-sided external protrusion for torque transfer?

Morse taper
External hex (Correct answer)
Internal hex
Spline connection

Correct answer: External hex

External hex connections have a hexagonal protrusion on top of the implant that fits into the abutment to resist rotational forces.

Question 108: Secondary stability (biological stability) in implant healing refers to:

The initial mechanical grip of the implant
Bone apposition and remodeling that increases stability over time (Correct answer)
Stability measured immediately after surgery
The stability provided by the final crown

Correct answer: Bone apposition and remodeling that increases stability over time

Secondary stability develops as osseointegration progresses — new bone formation increases the bone-to-implant contact area and overall implant firmness.

Question 109: In the All-on-4 concept, the two posterior implants are tilted at approximately what angle?

45 degrees (Correct answer)
60 degrees
30 degrees
10 degrees

Correct answer: 45 degrees

Posterior implants in the All-on-4 protocol are tilted at approximately 45 degrees to avoid anatomical structures (sinus/nerve) while maximizing bone contact and reducing cantilever length.

Question 110: The ideal implant crown to implant ratio (crown height to implant length) should ideally be:

Less than 1:1
3:1 for maximum stability
1:1 or less for optimal force distribution (Correct answer)
Greater than 2:1

Correct answer: 1:1 or less for optimal force distribution

A crown-to-implant ratio of 1:1 or less ensures that bending moments from lateral forces are kept within the bone-implant interface's tolerance.

Question 111: The 'comfort zone' for implant placement in relation to the maxillary sinus floor is best described as:

Implants must not enter the sinus at all
At least 1–2 mm of bone must remain between the implant apex and the sinus floor (Correct answer)
Implants can safely penetrate up to 4 mm into the sinus
Sinus proximity has no clinical significance

Correct answer: At least 1–2 mm of bone must remain between the implant apex and the sinus floor

Maintaining 1–2 mm of bone between the implant apex and the sinus membrane prevents perforation while maximizing available bone height.

Question 112: When converting a patient's existing denture to an implant overdenture, which step is critical?

Fabricating an entirely new denture
Performing bone grafting first in all cases
Ensuring the denture has adequate retention and space for attachment housings (Correct answer)
Removing all denture teeth and replacing with implant crowns

Correct answer: Ensuring the denture has adequate retention and space for attachment housings

The existing denture must be evaluated for adequate thickness, retention space, and structural integrity before retrofitting attachment housings.

Question 113: Micro-movement threshold that compromises osseointegration is generally accepted to be:

Greater than 300 microns
Less than 150 microns (Correct answer)
Less than 50 microns
100–150 microns

Correct answer: Less than 150 microns

Micro-movements exceeding 150 microns at the implant-bone interface disrupt healing and promote fibrous tissue encapsulation instead of osseointegration.

Question 114: Peri-implantitis is distinguished from peri-implant mucositis by the presence of:

Pain as the primary symptom
Progressive marginal bone loss with inflammation (Correct answer)
Only soft tissue inflammation
Suppuration only without bone changes

Correct answer: Progressive marginal bone loss with inflammation

Peri-implantitis involves active, progressive destruction of the supporting bone around a functioning implant in addition to soft tissue inflammation.

Question 115: Implant-supported crowns should NOT have which type of occlusal contact?

Anterior guidance involvement
Mutually protected occlusion contacts
Heavy working-side interferences during lateral excursion (Correct answer)
Centric stops on the central fossa

Correct answer: Heavy working-side interferences during lateral excursion

Working-side interferences on implant crowns create potentially destructive lateral forces that the implant bone interface cannot absorb with a periodontal ligament shock absorber.

Question 116: Which growth factor, found in demineralized bone matrix, plays the most critical role in bone regeneration by stimulating osteoblast differentiation?

Bone morphogenetic protein (BMP) (Correct answer)
Fibroblast growth factor (FGF)
Epidermal growth factor (EGF)
Vascular endothelial growth factor (VEGF)

Correct answer: Bone morphogenetic protein (BMP)

Bone morphogenetic proteins (BMPs), particularly BMP-2 and BMP-7, are the most potent osteoinductive signals; they are exposed during demineralization of bone matrix and are FDA-approved as recombinant proteins for bone regeneration.

Question 117: Which imaging modality is considered the gold standard for implant treatment planning in the US?

Cone Beam CT (CBCT) (Correct answer)
Panoramic radiograph
Periapical radiograph
MRI

Correct answer: Cone Beam CT (CBCT)

CBCT provides three-dimensional data of bone volume, density, and proximity to vital structures essential for accurate implant planning.

Question 118: The peri-implant blood clot formed immediately after implant placement serves as:

A substitute for bone graft material
A scaffold for cellular migration and initiating the healing cascade (Correct answer)
A barrier to prevent infection only
Permanent connective tissue

Correct answer: A scaffold for cellular migration and initiating the healing cascade

The fibrin clot matrix provides a provisional scaffold for cell migration including osteoblasts, fibroblasts, and endothelial cells that initiate tissue regeneration.

Question 119: What is the implant-abutment connection zone called where the two components meet?

Platform
Cervical junction
Emergence profile
Micro-gap (Correct answer)

Correct answer: Micro-gap

The micro-gap is the small interface between the implant fixture and abutment where bacterial colonization can occur if not properly sealed.

Question 120: Cement-retained implant complications from excess cement are best prevented by:

Using a screw-retained design or placing margins supragingivally for visible cement cleanup (Correct answer)
Using zinc phosphate cement exclusively
Cementing under pressure
Using more cement for better retention

Correct answer: Using a screw-retained design or placing margins supragingivally for visible cement cleanup

Placing the crown margin at or above the gum line allows visual confirmation that all cement is removed; alternatively, screw retention eliminates cement-related complications entirely.

Question 121: Osseointegration is best defined as:

Calcium deposition on the implant surface only
Direct structural and functional connection between living bone and the implant surface without intervening connective tissue (Correct answer)
Fibrous tissue encapsulation of the implant
Bone growth over the implant crown

Correct answer: Direct structural and functional connection between living bone and the implant surface without intervening connective tissue

True osseointegration requires direct bone-to-implant contact at the light microscope level without any fibrous tissue at the interface.

Question 122: When evaluating a patient for full-arch implant-supported fixed prosthesis (All-on-4), what is the minimum number of implants typically placed per arch?

8
6
4 (Correct answer)
2

Correct answer: 4

The All-on-4 protocol places 4 implants per arch (2 axial anterior, 2 tilted posterior) to support a full-arch fixed prosthesis.

Question 123: Which prosthetic material is most commonly used for implant-supported crowns in the posterior region due to its strength?

Composite resin
Monolithic zirconia (Correct answer)
Feldspathic porcelain
Full-cast gold

Correct answer: Monolithic zirconia

Monolithic zirconia is preferred posteriorly for its high fracture resistance, low chipping rate, and excellent wear properties under heavy occlusal load.

Question 124: The healing time for osseointegration in dense cortical bone (Type I) compared to softer bone (Type IV) is typically:

Shorter in Type I due to denser bone
The same regardless of bone type
Longer in Type I due to reduced vascularity (Correct answer)
Longer in Type IV due to faster bone metabolism

Correct answer: Longer in Type I due to reduced vascularity

Dense cortical bone (Type I) has lower vascularity and blood supply, requiring longer healing time (up to 6 months) compared to more vascular cancellous bone.

Question 125: Flapless implant surgery (keyhole surgery) requires which prerequisite?

Significant bone augmentation needed
Only applicable in edentulous patients
No local anesthesia needed
Adequate bone volume confirmed by CBCT and use of a surgical guide (Correct answer)

Correct answer: Adequate bone volume confirmed by CBCT and use of a surgical guide

Flapless surgery relies entirely on CBCT data and a surgical guide for accurate placement since the operator cannot visualize the bone directly.

Question 126: Digital implant impressions using intraoral scanners compared to conventional impressions offer:

Limited use to single tooth cases only
Requirement of impression copings still
Elimination of physical impression materials and improved patient comfort (Correct answer)
Lower accuracy for multiple implants

Correct answer: Elimination of physical impression materials and improved patient comfort

Digital scan abutments and intraoral scanners eliminate messy impression materials and provide digital workflows directly to CAD/CAM fabrication.

Question 127: The osteotome technique for sinus floor elevation (crestal approach/Summers technique) is best indicated when:

Residual bone height is 6–8 mm, requiring 2–4 mm of lift (Correct answer)
The patient has allergic rhinitis
Sinus needs more than 10 mm of elevation
There is acute sinusitis

Correct answer: Residual bone height is 6–8 mm, requiring 2–4 mm of lift

The crestal sinus lift is most predictable when 6–8 mm of residual bone remains and only a modest elevation (2–4 mm) is needed simultaneously with implant placement.

Question 128: What makes autogenous bone grafts the gold standard compared to all other graft types?

They eliminate all risk of disease transmission
They are more readily available in large quantities
They possess osteogenic, osteoinductive, and osteoconductive properties (Correct answer)
They require no donor site surgery

Correct answer: They possess osteogenic, osteoinductive, and osteoconductive properties

Autogenous grafts contain living bone-forming cells (osteoblasts and osteoprogenitor cells), making them the only graft type with all three properties: osteogenic, osteoinductive, and osteoconductive.

Question 129: Phonetic problems after implant-supported full arch restoration are most commonly due to:

Number of implants used
Implant surface roughness
Incorrect palatal contour or excessive bulk of the prosthesis affecting tongue space (Correct answer)
Shade selection of the prosthesis

Correct answer: Incorrect palatal contour or excessive bulk of the prosthesis affecting tongue space

Excessive palatal bulk, incorrect tooth position, or inadequate tongue space in full-arch implant prostheses can cause lisping, slurring, or difficulty with sibilant sounds.

AAID Associate Fellow Dental Implants Written Exam

The American Academy of Implant Dentistry (AAID) Part 1 Written Exam tests dental professionals on clinical knowledge and application of implant dentistry, covering basic sciences, diagnostics, prosthetics, and surgical techniques required for Associate Fellow credentialing.

150

Questions

240 min

Time Limit

70%

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