ADEX Dental Hygiene Exam — Questions and Answers

Question 1: What is the normal clinical attachment level (CAL) in a healthy periodontium?

5–6 mm
1–2 mm
0 mm (Correct answer)
3–4 mm

Correct answer: 0 mm

In a healthy periodontium, the clinical attachment level is 0 mm because the junctional epithelium attaches at the CEJ with no apical migration.

Question 2: A conscious patient who ingested an overdose of local anesthetic begins experiencing perioral numbness and metallic taste. These are signs of toxicity affecting which system first?

Cardiovascular system
Renal system
Central nervous system (Correct answer)
Hepatic system

Correct answer: Central nervous system

CNS toxicity from local anesthetic overdose manifests first with perioral numbness, tinnitus, metallic taste, and agitation before progressing to cardiovascular collapse.

Question 3: What should you do if your mast becomes wet?

Exercise
Eat
Sleep
Change it immediately (Correct answer)

Correct answer: Change it immediately

In a dental context, if protective equipment like a mask or gown (potentially referred to as 'mast' due to a typo) becomes wet, especially with bodily fluids, its barrier properties are compromised. Therefore, it should be changed immediately to maintain proper infection control. This action is crucial for protecting both the patient and the dental professional from potential contamination.

Question 4: A radiopaque structure that appears to move in the same direction as the x-ray tube shift during SLOB technique is located:

At the same depth as the reference object
Lingually (Correct answer)
Buccally
Below the mandibular canal

Correct answer: Lingually

With the SLOB rule (Same = Lingual, Opposite = Buccal), an object moving with the tube shift is on the lingual side.

Question 5: Environmental surface disinfectants used in dentistry must be EPA-registered as:

Sterile solutions
Antiseptics
Hospital disinfectants (Correct answer)
Food-safe sanitizers

Correct answer: Hospital disinfectants

The CDC recommends EPA-registered hospital disinfectants for decontamination of clinical contact surfaces in dental settings.

Question 6: Which dietary monosaccharide is most readily fermented by Streptococcus mutans to produce lactic acid?

Sucrose
Lactose
Fructose
Glucose (Correct answer)

Correct answer: Glucose

Glucose is the primary substrate for glycolysis in S. mutans, producing lactic acid that demineralizes enamel.

Question 7: A patient taking bisphosphonates (e.g., alendronate) for osteoporosis should be counseled regarding which potential oral complication?

Xerostomia
Medication-related osteonecrosis of the jaw (MRONJ) (Correct answer)
Increased caries rate
Gingival hyperplasia

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

Bisphosphonates inhibit osteoclast activity and impair bone remodeling, increasing the risk of osteonecrosis following invasive dental procedures.

Question 8: A patient on beta-blocker therapy has a severe allergic reaction. Which clinical concern arises when administering epinephrine?

Beta-blockers potentiate epinephrine, causing excessive hypertension
Epinephrine will be ineffective because beta-blockers block all adrenergic receptors
The beta-blockade may blunt epinephrine's bronchodilatory effect and paradoxically worsen bronchospasm (Correct answer)
Epinephrine is contraindicated and should be replaced with diphenhydramine alone

Correct answer: The beta-blockade may blunt epinephrine's bronchodilatory effect and paradoxically worsen bronchospasm

Beta-blockers can oppose the beta-2 bronchodilatory effect of epinephrine and cause paradoxical bronchospasm and refractory hypotension in anaphylaxis.

Question 9: Which cell is the primary mediator of alveolar bone resorption in periodontal disease?

Osteoclast (Correct answer)
Cementoblast
Osteoblast
Fibroblast

Correct answer: Osteoclast

Osteoclasts resorb mineralized bone tissue and are the primary cells responsible for the alveolar bone loss seen in periodontitis.

Question 10: A dental hygienist recaps a needle using the one-hand scoop technique. This practice is intended to:

Reduce the risk of needlestick injury (Correct answer)
Allow reuse of disposable needles
Speed up instrument turnover
Eliminate the need for a sharps container

Correct answer: Reduce the risk of needlestick injury

The one-hand scoop technique keeps the non-dominant hand away from the needle, significantly reducing the risk of an accidental needlestick.

Question 11: When a patient bites through a celluloid crown form filled with composite, the purpose of making small vent holes is to:

Enable the clinician to assess the depth of material placement
Release excess material and prevent air entrapment (Correct answer)
Allow oxygen to initiate polymerization at the surface
Permit moisture from saliva to activate the self-cure mechanism

Correct answer: Release excess material and prevent air entrapment

Vent holes in crown forms allow air bubbles and excess composite to escape as the patient bites down, reducing voids in the final restoration.

Question 12: An anxious 18-year-old patient begins breathing rapidly and complains of tingling in their fingers and feeling lightheaded. The most appropriate initial management is to:

Attempt to calm the patient and coach them to slow their breathing rate. (Correct answer)
Place the patient in a supine position and elevate their legs.
Have the patient breathe into a paper bag.
Administer oxygen via a face mask.

Correct answer: Attempt to calm the patient and coach them to slow their breathing rate.

The patient is hyperventilating, which is causing an excessive loss of carbon dioxide. The primary treatment is to calm the patient and help them control their breathing rate. Administering oxygen can worsen the respiratory alkalosis. Breathing into a paper bag is no longer recommended due to the risk of significant hypoxia and misdiagnosis.

Question 13: A patient presents with a localized, painful, swollen lesion on the lateral aspect of tooth #14, which has a 7mm periodontal pocket. The tooth tests vital. What is the MOST likely diagnosis?

Periapical abscess
Periodontal abscess (Correct answer)
Gingival abscess
Pericoronal abscess

Correct answer: Periodontal abscess

A periodontal abscess is a localized purulent infection within the periodontal tissues, typically associated with a pre-existing deep periodontal pocket. Key diagnostic features include location on the lateral aspect of the root and a vital pulp, distinguishing it from a periapical abscess which originates from a non-vital pulp.

Question 14: Which surface of the tooth faces the tongue?

Labial
Lingual (Correct answer)
Facial
Buccal

Correct answer: Lingual

The lingual surface of a tooth is the surface that faces the tongue.

Question 15: What radiographic change is associated with hypercementosis?

Loss of lamina dura and widened PDL space
Irregular root surface with external resorption pits
Bulbous thickening of the root with an intact PDL space and lamina dura (Correct answer)
Root shortening and blunting of the apex

Correct answer: Bulbous thickening of the root with an intact PDL space and lamina dura

Hypercementosis appears as a bulbous enlargement of the root due to excess cementum deposition, with the PDL space and lamina dura remaining intact.

Question 16: What three types of dental mirrors are there?

Front surface, back surface, and flat surface
Front surface, back surface, and marginal surface
Front surface, concave, and plane (Correct answer)
Front surface, mid surface, and back surface

Correct answer: Front surface, concave, and plane

Dental mirrors come in three main types, each offering distinct advantages for intraoral examination. Front surface mirrors provide the clearest image by eliminating ghost images, as the reflective coating is on the front of the glass. Concave (magnifying) mirrors enlarge the image, which can be useful for detailed inspection, while plane (flat) mirrors offer a true-to-size image without magnification or distortion.

Question 17: A patient develops stridor (high-pitched inspiratory noise) after receiving a local anesthetic injection. This sign most likely indicates:

Bronchospasm in the lower airways
Upper airway obstruction due to angioedema or anaphylaxis (Correct answer)
Hyperventilation from anxiety
Aspiration of a dental instrument

Correct answer: Upper airway obstruction due to angioedema or anaphylaxis

Stridor is caused by partial upper airway obstruction and, in the post-injection setting, strongly suggests angioedema or anaphylaxis requiring immediate epinephrine administration.

Question 18: Instruments packaged before sterilization should be stored in a manner that:

Maximizes air circulation by leaving packages loosely stacked
Protects packages from moisture, dust, and puncture until point of use (Correct answer)
Allows packages to be opened and inspected daily for sterility
Keeps packages refrigerated to extend sterility

Correct answer: Protects packages from moisture, dust, and puncture until point of use

Sterile packages must be stored in a clean, dry, protected environment to maintain package integrity and the event-related sterility concept.

Question 19: How often should one clean their teeth each day?

Twice (Correct answer)
As often as you can
Once
Thrice

Correct answer: Twice

Dental professionals generally recommend cleaning teeth twice a day, typically in the morning and before bed. This frequency helps to effectively remove plaque and food debris, preventing the buildup of bacteria. Regular brushing twice daily is essential for maintaining good oral hygiene and preventing issues like cavities and gingivitis.

Question 20: A patient reports an allergy to sulfa drugs. Which local anesthetic should be avoided due to its ester linkage and potential cross-reactivity with PABA metabolites?

Lidocaine
Mepivacaine
Articaine
Procaine (Correct answer)

Correct answer: Procaine

Ester anesthetics like procaine are metabolized to para-aminobenzoic acid (PABA), which can cause allergic reactions in patients sensitive to sulfonamides.

Question 21: What is the role of an oxygen inhibition layer on the surface of a light-cured composite restoration?

It protects the restoration from staining during the first 24 hours
It is an incompletely polymerized tacky surface layer that can bond subsequent increments or veneers (Correct answer)
It prevents post-cure shrinkage from occurring at the surface
It acts as a lubricant to aid polishing procedures immediately after cure

Correct answer: It is an incompletely polymerized tacky surface layer that can bond subsequent increments or veneers

Oxygen inhibits polymerization at the composite surface, leaving a thin uncured layer that is advantageous for bonding additional increments or veneers chemically.

Question 22: Which of the following is considered the most definitive or 'gold standard' method for verifying the effectiveness of a sterilization cycle?

External chemical indicators on the outside of each package
Biological indicators (spore tests) (Correct answer)
Mechanical monitoring of time, temperature, and pressure gauges
Internal chemical indicators placed inside each package

Correct answer: Biological indicators (spore tests)

Biological indicators (spore tests) are the highest standard for sterilization monitoring because they directly challenge the sterilizer's ability to kill highly resistant microorganisms, such as Geobacillus stearothermophilus spores. A negative result confirms the sterilization process was lethal. Chemical and mechanical monitoring only indicate that certain physical conditions were met but do not directly prove microbial death.

Question 23: You are assessing a 68-year-old male patient who suddenly slurs his speech, complains of a severe headache, and exhibits drooping on the right side of his face. After calling 911, what is the MOST critical piece of information to obtain for the emergency medical team?

The exact time the symptoms first started. (Correct answer)
The name of the patient's cardiologist.
A list of the patient's allergies.
The time of the patient's last meal.

Correct answer: The exact time the symptoms first started.

The patient is showing classic signs of a cerebrovascular accident (CVA), or stroke. The time of symptom onset is the most critical piece of information because it determines the patient's eligibility for thrombolytic therapy (clot-busting drugs), which must be administered within a narrow time window (often 3 to 4.5 hours) to be effective. [3, 5, 11] This information directly impacts the course of treatment and patient outcome. [5, 7, 10]

Question 24: Which sterilization method is appropriate for heat-sensitive items that cannot withstand autoclaving?

Boiling water for 20 minutes
Immersion in isopropyl alcohol
Dry heat oven at 160°C
Ethylene oxide (EtO) sterilization (Correct answer)

Correct answer: Ethylene oxide (EtO) sterilization

Ethylene oxide gas sterilization is effective for heat- and moisture-sensitive instruments, though it requires long aeration times and has special handling requirements.

Question 25: A patient's panoramic radiograph shows a radiopaque mass with a 'cotton-wool' or 'ground-glass' appearance in the jaw. What condition does this most likely represent?

Osteosarcoma
Fibrous dysplasia in early stage
Florid cemento-osseous dysplasia or Paget's disease of bone (Correct answer)
Condensing osteitis

Correct answer: Florid cemento-osseous dysplasia or Paget's disease of bone

A 'cotton-wool' or 'ground-glass' radiographic pattern in the jaws is characteristic of Paget's disease of bone or florid cemento-osseous dysplasia.

Question 26: A patient with asthma begins wheezing and shows signs of respiratory distress mid-appointment. After positioning the patient upright, what is the next step?

Administer epinephrine 1:1000 IM
Administer supplemental oxygen at 15 L/min via non-rebreather mask
Call 911 immediately and do nothing else
Assist the patient in using their prescribed bronchodilator inhaler (Correct answer)

Correct answer: Assist the patient in using their prescribed bronchodilator inhaler

The first pharmacologic intervention for a mild-to-moderate asthma attack is the patient's own short-acting beta-agonist bronchodilator (e.g., albuterol).

Question 27: A dental hygienist notes a 3 mm zone of attached gingiva on the facial of tooth #25. Which of the following best describes this finding?

Within the range of normal and requires monitoring (Correct answer)
Evidence of Stage III periodontitis
Inadequate attached gingiva requiring immediate surgical referral
Pathological recession requiring grafting

Correct answer: Within the range of normal and requires monitoring

A minimum of 1-2 mm of attached gingiva is generally considered adequate; 3 mm is within normal range and requires monitoring rather than intervention.

Question 28: An increase in which component within the Gingival Crevicular Fluid (GCF) is MOST indicative of active periodontal tissue destruction and inflammation?

Albumin
Keratinocytes
Host-derived enzymes like MMP-8 (Correct answer)
Glucose concentration

Correct answer: Host-derived enzymes like MMP-8

Gingival Crevicular Fluid (GCF) analysis can be a diagnostic tool. An increase in host-derived enzymes, specifically Matrix Metalloproteinase-8 (MMP-8, or collagenase-2), is strongly associated with the breakdown of collagen in the periodontal ligament and alveolar bone, indicating active disease. These enzymes are released by host cells like neutrophils during an inflammatory response.

Question 29: A patient with a known history of Type 1 diabetes suddenly becomes confused, weak, and their skin feels cold and clammy. They are conscious and able to swallow. What is the MOST appropriate immediate action?

Administer an injection of glucagon.
Provide a source of easily digestible sugar, such as orange juice or glucose tablets. (Correct answer)
Monitor vital signs and wait for symptoms to resolve.
Administer the patient's own insulin.

Correct answer: Provide a source of easily digestible sugar, such as orange juice or glucose tablets.

These are classic signs and symptoms of hypoglycemia (low blood sugar). For a conscious patient who can swallow, the standard of care is to administer 15-20 grams of a fast-acting carbohydrate to quickly raise their blood glucose level. [1, 6, 24] Administering insulin would dangerously lower their blood sugar further. Glucagon is typically reserved for unconscious patients or those unable to swallow. [1, 6]

Question 30: The epinephrine auto-injector (EpiPen) used for anaphylaxis in the dental office contains which concentration of epinephrine?

1:1,000 (Correct answer)
1:100,000
1:10,000
1:100

Correct answer: 1:1,000

The standard EpiPen delivers epinephrine at 1:1,000 concentration (1 mg/mL) in a 0.3 mg dose for adults.

Question 31: The OSHA Bloodborne Pathogen Standard requires that the exposure control plan be reviewed and updated at minimum:

Every 6 months
Only when a new employee is hired
Annually and whenever new tasks or procedures are added (Correct answer)
Every 2 years

Correct answer: Annually and whenever new tasks or procedures are added

OSHA requires annual review of the exposure control plan and updates whenever tasks, procedures, or employee positions change that affect exposure.

Question 32: Which emergency medication in the dental office kit is used to manage a patient experiencing an adrenal crisis (acute adrenal insufficiency)?

Diphenhydramine IV
Nitroglycerin sublingual spray
Hydrocortisone sodium succinate (Solu-Cortef) injectable (Correct answer)
Glucagon IM injection

Correct answer: Hydrocortisone sodium succinate (Solu-Cortef) injectable

Hydrocortisone (Solu-Cortef) replaces the cortisol that patients on chronic corticosteroid therapy or with Addison's disease cannot produce during surgical stress.

Question 33: During implementation, a patient with dentinal hypersensitivity requests relief. Which in-office treatment is MOST evidence-based for immediate desensitization?

Application of 5% sodium fluoride varnish (Correct answer)
Polishing with coarse prophy paste
Prescribing a chlorhexidine rinse
Performing air-powder polishing

Correct answer: Application of 5% sodium fluoride varnish

5% sodium fluoride varnish occlude dentinal tubules and is among the most effective in-office treatments for dentinal hypersensitivity.

Question 34: Which systemic condition is associated with Papillon-Lefèvre syndrome, which causes severe early-onset periodontitis?

Down syndrome causing altered immune response
Mutations in the cathepsin C gene causing neutrophil dysfunction (Correct answer)
Hypophosphatasia causing abnormal cementum formation
Chediak-Higashi syndrome affecting lysosomal trafficking

Correct answer: Mutations in the cathepsin C gene causing neutrophil dysfunction

Papillon-Lefèvre syndrome is caused by mutations in the cathepsin C gene, leading to impaired neutrophil function and severe periodontitis beginning in primary dentition.

Question 35: A dentist needs to place a temporary crown and requires a luting agent that has a sedative or palliative effect on the pulp. Which of the following cements would be the most suitable choice?

Zinc oxide-eugenol (ZOE) (Correct answer)
Glass ionomer
Zinc phosphate
Resin-modified glass ionomer (RMGI)

Correct answer: Zinc oxide-eugenol (ZOE)

Zinc oxide-eugenol (ZOE) cement is well-known for its sedative (obtundent) effect on the dental pulp, which is largely due to the eugenol component (oil of cloves). This property, combined with its low strength for easy removal, makes it an ideal choice for the temporary cementation of crowns and bridges. The other listed cements are designed for more permanent luting.

Question 36: When screening for oral cancer, the dental hygienist should pay particular attention to which anatomical sites as the highest-risk locations for squamous cell carcinoma?

Hard palate and dorsal tongue
Labial mucosa and buccal vestibule
Lateral and ventral tongue and floor of mouth (Correct answer)
Attached gingiva and buccal frenum

Correct answer: Lateral and ventral tongue and floor of mouth

The lateral/ventral tongue and floor of the mouth account for the majority of oral squamous cell carcinoma cases and require thorough inspection.

Question 37: When using an AED in the dental office, which action should be taken BEFORE the device analyzes the patient's heart rhythm?

Administer epinephrine
Ensure no one is touching the patient (Correct answer)
Deliver one rescue breath
Check the patient's blood pressure

Correct answer: Ensure no one is touching the patient

Everyone must be clear of patient contact during AED rhythm analysis and shock delivery to prevent the electrical current from passing through bystanders.

Question 38: What is the primary cause of polymerization shrinkage in composite resins?

Evaporation of solvent from the resin matrix during curing
Van der Waals distances converting to shorter covalent bonds during crosslinking (Correct answer)
Thermal contraction as the material cools after light activation
Loss of water from the hydrophilic resin component

Correct answer: Van der Waals distances converting to shorter covalent bonds during crosslinking

During polymerization, monomers linked by van der Waals forces form shorter covalent bonds, reducing intermolecular distance and causing volumetric shrinkage.

Question 39: The purpose of adding silane coupling agent to composite resin filler particles is to:

Bond the inorganic filler to the organic resin matrix (Correct answer)
Improve color stability of the material
Reduce polymerization shrinkage
Increase the radiopacity of the restoration

Correct answer: Bond the inorganic filler to the organic resin matrix

Silane coupling agents form a chemical bridge between the inorganic glass filler and the organic resin matrix, enhancing composite strength and durability.

Question 40: When mixing alginate impression material, using cold water will:

Accelerate the setting reaction
Have no effect on setting time
Prolong the working and setting time (Correct answer)
Decrease the working and setting time

Correct answer: Prolong the working and setting time

Cold water slows the chemical reaction in alginate, extending both working and setting times, which is useful when more manipulation time is needed.

Question 41: Which antibiotic is the first-line prophylaxis recommendation for patients with cardiac conditions requiring infective endocarditis (IE) prevention before dental procedures?

Metronidazole 500 mg
Azithromycin 500 mg
Clindamycin 600 mg
Amoxicillin 2 g orally 30–60 minutes before the procedure (Correct answer)

Correct answer: Amoxicillin 2 g orally 30–60 minutes before the procedure

The AHA recommends amoxicillin 2 g orally 30–60 minutes before high-risk dental procedures as the first-line IE prophylaxis in adults.

Question 42: What is the main advantage of using a rubber base (polysulfide) impression material over alginate?

It provides greater dimensional accuracy and longer storage stability (Correct answer)
It is more hydrophilic and works better in wet fields
It is less expensive and easier to manipulate
It sets faster with no retarder needed

Correct answer: It provides greater dimensional accuracy and longer storage stability

Polysulfide impressions are dimensionally more stable than alginate and can be poured hours after taking the impression, unlike alginate which must be poured immediately.

Question 43: Regulated medical waste in a dental office includes all of the following EXCEPT:

Blood-saturated gauze
Sharps (needles, scalpel blades)
Used saliva ejectors (Correct answer)
Extracted teeth

Correct answer: Used saliva ejectors

Used saliva ejectors are generally not classified as regulated medical waste unless saturated with blood; they are typically disposed of as regular trash.

Question 44: A patient presents with white, cottage-cheese-like lesions on the tongue and buccal mucosa that wipe off, leaving an erythematous base. Which condition is MOST likely?

Oral candidiasis (thrush) (Correct answer)
Lichen planus
Aphthous ulcer
Leukoplakia

Correct answer: Oral candidiasis (thrush)

Pseudomembranous candidiasis (thrush) presents as removable white plaques leaving a red, raw surface when wiped.

Question 45: What is galvanic corrosion in the oral cavity?

Oxidation of amalgam margins causing staining
Electrochemical degradation occurring when dissimilar metals contact in saliva (Correct answer)
Tarnish formation on gold alloy surfaces
Chemical dissolution of a restoration in acidic saliva

Correct answer: Electrochemical degradation occurring when dissimilar metals contact in saliva

Galvanic corrosion occurs when two dissimilar metals are in electrical contact via saliva, creating a battery-like cell that corrodes the more anodic metal.

Question 46: During a comprehensive periodontal assessment, mobility is graded as Class II. What does this indicate?

Tooth moves 1-2 mm horizontally in any direction (Correct answer)
Tooth moves slightly more than normal (up to 1 mm horizontally)
Tooth is depressible in its socket (vertical mobility)
Tooth is ankylosed with no mobility

Correct answer: Tooth moves 1-2 mm horizontally in any direction

Class II tooth mobility is defined as horizontal movement of 1-2 mm, indicating moderate periodontitis or bone loss.

Question 47: Which type of glove is required when handling liquid chemical sterilants such as glutaraldehyde during instrument reprocessing?

Sterile surgical gloves
Heavy-duty utility gloves (Correct answer)
Nitrile examination gloves
Latex examination gloves

Correct answer: Heavy-duty utility gloves

Heavy-duty utility (puncture-resistant) gloves are required for handling glutaraldehyde and other chemical sterilants; thin examination gloves provide inadequate chemical protection.

Question 48: Which cytokine, produced by macrophages, is a key mediator of bone resorption and connective tissue destruction in periodontitis?

IL-1β (Correct answer)
IL-4
TGF-β
IL-10

Correct answer: IL-1β

IL-1β is a pro-inflammatory cytokine produced by macrophages that stimulates osteoclast activity and upregulates prostaglandin E2, driving bone resorption.

Question 49: Which type of radiation has the HIGHEST energy in dental radiography?

Visible light
X-rays (Correct answer)
Infrared rays
Radio waves

Correct answer: X-rays

X-rays used in dental radiography have very short wavelengths and high energy, allowing them to penetrate soft and hard tissues.

Question 50: Latex hypersensitivity in dental patients is best managed by:

Scheduling the patient as the last appointment of the day
Pre-medicating the patient with antihistamines only
Using latex-free gloves and latex-free equipment throughout treatment (Correct answer)
Using low-allergen powdered latex gloves

Correct answer: Using latex-free gloves and latex-free equipment throughout treatment

Latex-allergic patients require a completely latex-free environment, including gloves, dams, and any other latex-containing materials.

Question 51: Which instrument is used to measure probing depth during a periodontal assessment?

Periodontal probe (Correct answer)
Scaler
Explorer
Curette

Correct answer: Periodontal probe

The periodontal probe is calibrated in millimeters and is specifically designed to measure sulcus and pocket depth.

Question 52: Which vasoconstrictor concentration is most commonly found in dental local anesthetic cartridges in the United States?

1:200,000 epinephrine
1:50,000 epinephrine
1:10,000 epinephrine
1:100,000 epinephrine (Correct answer)

Correct answer: 1:100,000 epinephrine

1:100,000 epinephrine is the standard concentration in most dental cartridges, providing adequate vasoconstriction with minimal cardiovascular risk.

Question 53: When performing dental radiography, infection control requires that:

Gloves may be removed before handling the X-ray unit controls if hands appear clean
The X-ray unit head, controls, and chair must be covered with barriers or disinfected between patients (Correct answer)
Patients remove their own films to avoid contamination
Film packets do not require disinfection because radiation sterilizes them

Correct answer: The X-ray unit head, controls, and chair must be covered with barriers or disinfected between patients

All surfaces touched during radiography — including tube head, control panel, and positioning devices — must be barrier-protected or disinfected between patients.

Question 54: Which position is recommended for a pregnant patient who becomes hypotensive in the dental chair?

Left lateral tilt (15-30 degrees) (Correct answer)
Supine with legs elevated 45 degrees
Trendelenburg position (head-down)
Sitting upright at 90 degrees

Correct answer: Left lateral tilt (15-30 degrees)

Left lateral tilt displaces the gravid uterus off the inferior vena cava, relieving supine hypotensive syndrome by restoring venous return in the third trimester.

Question 55: What term describes the accumulation of calcified deposits on tooth surfaces?

Pellicle
Biofilm
Plaque
Calculus (Correct answer)

Correct answer: Calculus

Calculus (tartar) is mineralized dental plaque that forms hard deposits on tooth surfaces above and below the gumline.

Question 56: When implementing motivational interviewing (MI) during patient education, which behavior BEST reflects the 'rolling with resistance' principle?

Directly challenging the patient's reluctance to floss
Listing all the consequences of poor oral hygiene
Providing a written home care instruction sheet
Acknowledging the patient's ambivalence and reflecting it back without arguing (Correct answer)

Correct answer: Acknowledging the patient's ambivalence and reflecting it back without arguing

Rolling with resistance in MI means avoiding confrontation and instead acknowledging and reflecting the patient's ambivalence to reduce defensiveness.

Question 57: A patient with a history of adrenal insufficiency is undergoing a lengthy, stressful procedure. Which emergency is this patient at risk for?

Hyperthyroid storm
Addisonian (adrenal) crisis (Correct answer)
Diabetic ketoacidosis
Hypertensive crisis

Correct answer: Addisonian (adrenal) crisis

Patients with adrenal insufficiency cannot produce adequate cortisol in response to surgical stress, potentially triggering an Addisonian crisis with profound hypotension.

Question 58: Which of the following methods provides the ultimate verification of sterilization success by directly challenging the sterilization process?

Using a biological indicator (spore test) on a weekly basis. (Correct answer)
Checking the sterilizer's physical readouts for correct time, temperature, and pressure.
Placing an internal chemical indicator strip in each package.
Observing the external chemical indicator tape for a color change.

Correct answer: Using a biological indicator (spore test) on a weekly basis.

Biological indicators, or spore tests, are the most accepted method for monitoring the sterilization process because they directly assess the procedure's effectiveness at killing the most resistant microorganisms, such as Geobacillus stearothermophilus. While mechanical and chemical indicators are crucial for routine monitoring of each load, they only show that certain physical conditions were met, not that sterilization was actually achieved.

Question 59: It's crucial to ask a patient as many questions as you can in order to learn as much as you can about them.

Probing
Open-ended
Indirect (Correct answer)
Direct

Correct answer: Indirect

Indirect questions are often more effective in gathering comprehensive information about a patient because they encourage more elaborate and thoughtful responses. Unlike direct questions that elicit a simple 'yes' or 'no,' indirect questions prompt the patient to provide details, feelings, and perspectives, fostering a deeper understanding of their concerns and history. This approach builds rapport and can uncover underlying issues that direct questions might miss.

Question 60: A patient presents with moderate periodontitis. According to the 2017 AAP classification system, which factor is the PRIMARY determinant for assigning the initial Stage (I-IV) of periodontitis?

Probing depth measurements
Radiographic bone loss percentage
Clinical Attachment Loss (CAL) (Correct answer)
Presence of bleeding on probing

Correct answer: Clinical Attachment Loss (CAL)

The 2017 AAP classification system for periodontitis uses Clinical Attachment Loss (CAL) as the primary determinant for establishing the initial stage of the disease. While radiographic bone loss, probing depths, and tooth loss also contribute to determining the final stage and complexity, interdental CAL at the worst site is the first factor to consider.

Question 61: A dental patient with Type 1 diabetes becomes unresponsive. The hygienist cannot confirm whether blood glucose is low or high. What should be done?

Withhold glucose in case the patient is hyperglycemic
Administer insulin and call 911
Place the patient supine and monitor without intervention
Administer oral glucose and activate EMS (Correct answer)

Correct answer: Administer oral glucose and activate EMS

When uncertain about diabetic emergency type in an unresponsive patient, administering glucose is safer because hypoglycemia is rapidly fatal while hyperglycemia worsens slowly.

Question 62: An ultrasonic insert tip designed for use in periodontal pockets is recognized by its:

Textured surface to improve grip during scaling
Large diameter and blunt end for safety
Curved arc shape identical to a Gracey curette
Slender, elongated design allowing subgingival access to narrow pockets (Correct answer)

Correct answer: Slender, elongated design allowing subgingival access to narrow pockets

Slim-profile periodontal insert tips are designed to access deep, narrow pockets while minimizing tissue trauma.

Question 63: Which of the following is the BEST indicator of current periodontal disease activity during re-evaluation?

Presence of radiographic bone loss
Amount of calculus removed
Patient-reported pain levels
Bleeding on probing and change in probing depth (Correct answer)

Correct answer: Bleeding on probing and change in probing depth

Bleeding on probing combined with change in probing depth are the most clinically reliable indicators of current inflammation and disease activity.

Question 64: What is the primary purpose of disclosing solution in a dental hygiene appointment?

Detect plaque biofilm (Correct answer)
Whiten teeth
Numb soft tissue
Stain calculus

Correct answer: Detect plaque biofilm

Disclosing solution contains a dye that stains bacterial plaque, making it visible to both the clinician and patient.

Question 65: Which of the following BEST describes the primary goal of periodontal debridement, distinguishing it from traditional scaling and root planing?

Removal of only supragingival calculus deposits.
Disruption and removal of biofilm and calculus while conserving cementum. (Correct answer)
Removal of the soft tissue lining of the periodontal pocket.
Intentional removal of all cementum to create a glass-like root surface.

Correct answer: Disruption and removal of biofilm and calculus while conserving cementum.

The contemporary understanding of periodontal therapy emphasizes that the goal is not the aggressive removal of cementum. Periodontal debridement focuses on the disruption and removal of bacterial biofilm and calculus deposits from the tooth surface and within the pocket, with the specific intent of preserving the underlying cementum.

Question 66: Which statement about zirconia (zirconium oxide) dental ceramic is correct?

It is highly translucent and used primarily for anterior esthetic veneers
It is opaque and relies on transformation toughening for high strength (Correct answer)
It is a glass-ceramic that can be etched with hydrofluoric acid
It bonds easily to resin cements without surface treatment

Correct answer: It is opaque and relies on transformation toughening for high strength

Zirconia is a polycrystalline ceramic that undergoes transformation toughening (tetragonal to monoclinic phase transformation) under stress, giving it exceptional fracture resistance.

Question 67: Which type of bone defect has three remaining osseous walls and offers the best prognosis for regenerative therapy?

Hemiseptal defect
Three-wall (intrabony) defect (Correct answer)
One-wall defect
Two-wall defect

Correct answer: Three-wall (intrabony) defect

A three-wall intrabony defect is surrounded by bone on three sides, providing a contained environment that supports regenerative procedures with the best outcomes.

Question 68: When evaluating a panoramic radiograph, which landmark indicates the floor of the nasal cavity?

Incisive foramen
Nasal fossa (Correct answer)
Mental foramen
Coronoid process

Correct answer: Nasal fossa

The nasal fossa appears on panoramic radiographs as a radiolucent oval shadow representing the floor of the nasal cavity.

Question 69: Ultrasonic scalers primarily disrupt calculus through which mechanism?

Chemical dissolution via irrigant
Thermal energy melting calculus
Acoustic turbulence and cavitation (Correct answer)
Direct abrasion by the tip alone

Correct answer: Acoustic turbulence and cavitation

Ultrasonic scalers use acoustic streaming and cavitation from the oscillating tip and water coolant to disrupt deposits.

Question 70: When recording mobility for tooth #8, the clinician notes the tooth deflects 1–2 mm in a buccolingual direction. How is this documented?

Class I mobility
Class III mobility
Ankylosis
Class II mobility (Correct answer)

Correct answer: Class II mobility

Class II mobility is defined as movement of 1–2 mm in any horizontal direction.

Question 71: During periodontal maintenance, what is the primary goal of deplaquing subgingival surfaces?

Removal of all calculus to prevent pocket reformation
Stimulation of cementum regeneration
Disruption of the subgingival biofilm to allow host defenses to control residual bacteria (Correct answer)
Complete elimination of all periodontal bacteria

Correct answer: Disruption of the subgingival biofilm to allow host defenses to control residual bacteria

The goal is biofilm disruption to shift the microbial environment toward health-compatible species, allowing the host immune system to manage remaining bacteria.

Question 72: The nasopalatine nerve innervates the anterior hard palate and exits through which foramen?

Lesser palatine foramen
Incisive foramen (Correct answer)
Pterygopalatine foramen
Greater palatine foramen

Correct answer: Incisive foramen

The nasopalatine nerve exits through the incisive foramen, located in the midline of the anterior hard palate just posterior to the maxillary central incisors.

Question 73: A radiograph shows a radiolucent area at the apex of a non-vital tooth with an intact lamina dura elsewhere. This finding is most consistent with:

Normal anatomical landmark
Condensing osteitis
Periapical abscess or granuloma (Correct answer)
Periapical cemental dysplasia (early stage)

Correct answer: Periapical abscess or granuloma

A periapical radiolucency on a non-vital tooth with intact surrounding lamina dura is characteristic of a periapical abscess or granuloma.

Question 74: Which food group is considered protective against dental caries due to its ability to stimulate saliva and raise plaque pH?

Hard cheeses (Correct answer)
Fruit juices
Soft breads
Dried fruits

Correct answer: Hard cheeses

Hard cheeses stimulate saliva flow, provide casein phosphopeptide, and raise plaque pH due to their protein and fat content, reducing caries risk.

Question 75: A patient presents with generalized gingival redness, spontaneous bleeding, and painful ulcerations with a punched-out papillary appearance and a pseudomembrane. The most likely diagnosis is:

Acute herpetic gingivostomatitis
Plasma cell gingivitis
Necrotizing ulcerative gingivitis (NUG) (Correct answer)
Desquamative gingivitis from pemphigoid

Correct answer: Necrotizing ulcerative gingivitis (NUG)

NUG is characterized by punched-out necrotic interdental papillae, pseudomembrane formation, spontaneous bleeding, and pain.

Question 76: A patient on long-term bisphosphonate therapy for osteoporosis requires periodontal surgery. The primary concern is:

Increased risk of gingival enlargement
Accelerated bone regeneration post-surgery
Risk of medication-related osteonecrosis of the jaw (MRONJ) (Correct answer)
Reduced post-operative bleeding

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

Bisphosphonates inhibit osteoclast-mediated bone remodeling, increasing the risk of medication-related osteonecrosis of the jaw (MRONJ) following invasive procedures.

Question 77: Which of the following is NOT a component of the periodontium?

Dentin (Correct answer)
Periodontal ligament
Cementum
Alveolar bone

Correct answer: Dentin

Dentin is part of the tooth structure itself, not the periodontium, which consists of alveolar bone, PDL, cementum, and gingiva.

Question 78: Which lymph node group is the primary drainage site for the tip of the tongue?

Jugulo-omohyoid nodes
Parotid nodes
Submental nodes (Correct answer)
Submandibular nodes

Correct answer: Submental nodes

The submental lymph nodes drain the tip of the tongue, lower lip, and chin area, and are located between the two anterior bellies of the digastric muscle.

Question 79: During a comprehensive health history review, a patient discloses a history of rheumatic heart disease. What is the primary concern when planning dental hygiene treatment?

Risk of infective endocarditis requiring antibiotic prophylaxis evaluation (Correct answer)
Contraindication to local anesthesia with vasoconstrictor
Excessive bleeding due to concurrent anticoagulant use
Hypersensitivity to fluoride products

Correct answer: Risk of infective endocarditis requiring antibiotic prophylaxis evaluation

Rheumatic heart disease can cause valvular damage, which may require antibiotic prophylaxis evaluation per AHA guidelines before invasive dental procedures.

Question 80: During a procedure, a patient becomes unresponsive and has no pulse. The AED delivers a shock, but the patient remains pulseless. What is the immediate next step?

Administer epinephrine via IM injection
Deliver a second shock immediately
Check the rhythm again before resuming any action
Resume CPR beginning with chest compressions for 2 minutes (Correct answer)

Correct answer: Resume CPR beginning with chest compressions for 2 minutes

After any AED shock, regardless of outcome, immediately resume CPR starting with chest compressions for 2 minutes before re-analyzing the rhythm.

Question 81: Which muscle is primarily responsible for protruding the tongue and is innervated by the hypoglossal nerve?

Palatoglossus
Styloglossus
Genioglossus (Correct answer)
Hyoglossus

Correct answer: Genioglossus

The genioglossus is the primary tongue protruder, originating from the mental spine (genial tubercle) of the mandible and fanning out through the tongue.

Question 82: Which radiographic feature best distinguishes a periapical abscess from a periapical granuloma?

An abscess shows calcification within the lesion
Both appear identical radiographically and cannot be differentiated (Correct answer)
A granuloma shows root resorption while an abscess does not
A granuloma appears as a well-defined radiolucency while an abscess is always ill-defined

Correct answer: Both appear identical radiographically and cannot be differentiated

Periapical abscesses and granulomas cannot be reliably distinguished from each other radiographically; histopathologic examination is required for definitive diagnosis.

Question 83: A 55-year-old patient taking amlodipine for hypertension presents with generalized gingival enlargement. What is the MOST likely cause?

Drug-induced gingival enlargement from the calcium channel blocker (Correct answer)
Poorly controlled diabetes mellitus
Necrotizing gingivitis
Vitamin C deficiency

Correct answer: Drug-induced gingival enlargement from the calcium channel blocker

Calcium channel blockers such as amlodipine are known to cause drug-induced gingival enlargement in susceptible patients.

Question 84: During periodontal instrumentation, a 'walking stroke' with a probe is used to:

Polish root surfaces after scaling
Remove calculus along the root surface
Systematically assess the full circumference of the pocket depth (Correct answer)
Measure the width of attached gingiva

Correct answer: Systematically assess the full circumference of the pocket depth

The walking stroke moves the probe apically then advances 1–2 mm around the tooth to map the entire sulcus floor.

Question 85: Calcium and phosphate in the diet support remineralization of early carious lesions primarily through which mechanism?

Inhibiting S. mutans growth
Buffering plaque acids
Replenishing mineral ions lost from enamel (Correct answer)
Stimulating saliva flow

Correct answer: Replenishing mineral ions lost from enamel

Dietary calcium and phosphate provide ions that diffuse back into demineralized enamel, restoring hydroxyapatite crystal structure.

Question 86: A patient with a known peanut allergy develops generalized urticaria and throat tightness five minutes after receiving a topical anesthetic. Which drug should be administered first?

Hydrocortisone IV
Diphenhydramine (Benadryl) IM
Epinephrine 1:1000 IM (Correct answer)
Albuterol inhaler

Correct answer: Epinephrine 1:1000 IM

Epinephrine 1:1000 administered IM into the mid-outer thigh is the first-line treatment for anaphylaxis because it reverses airway obstruction and hypotension rapidly.

Question 87: During the assessment phase, a dental hygienist notices gingival bleeding on probing in posterior sextants only. Which periodontal classification best describes localized bleeding without bone loss?

Necrotizing periodontal disease
Stage I periodontitis
Stage II periodontitis
Gingivitis associated with dental biofilm (Correct answer)

Correct answer: Gingivitis associated with dental biofilm

Bleeding on probing without attachment or bone loss is consistent with gingivitis associated with dental biofilm per the 2017 classification.

Question 88: On a panoramic radiograph, which anatomical landmark appears as a radiopaque band running horizontally across the maxillary sinus region?

Zygomatic arch (Correct answer)
Coronoid process of the mandible
Nasal septum
Infraorbital rim

Correct answer: Zygomatic arch

The zygomatic arch frequently appears as a horizontal radiopaque band superimposed over the maxillary sinus on panoramic radiographs.

Question 89: When placing a direct composite restoration, the material is typically applied and cured in 2mm increments. What is the primary reason for this incremental placement technique?

To increase the radiopacity of the final restoration.
To decrease the total time required for light curing.
To improve the final shade matching of the restoration.
To reduce the effects of polymerization shrinkage. (Correct answer)

Correct answer: To reduce the effects of polymerization shrinkage.

Composite resins shrink as they polymerize (harden) upon light curing, creating stress at the bond between the restoration and the tooth. Placing and curing the material in small increments (1-2mm) minimizes the overall shrinkage stress, reducing the risk of marginal gap formation, microleakage, cusp deformation, and post-operative sensitivity. While layering can aid in aesthetics, its primary purpose is to manage shrinkage stress.

Question 90: What does 'cervical burnout' refer to in radiographic interpretation?

Dark areas caused by developer contamination
Radiation damage to enamel at the CEJ
A false radiolucency at the cervical margin of a tooth due to decreased x-ray absorption (Correct answer)
Overexposure of the cervical spine on a panoramic image

Correct answer: A false radiolucency at the cervical margin of a tooth due to decreased x-ray absorption

Cervical burnout is a radiographic artifact appearing as a false radiolucency at the cervical region of a tooth due to the relative thinness of tooth structure there.

Question 91: Spaulding's classification categorizes dental handpieces as:

Critical (Correct answer)
Semicritical
Low-risk environmental surface
Noncritical

Correct answer: Critical

Dental handpieces are classified as critical instruments because they penetrate soft tissue and bone, requiring sterilization between patients.

Question 92: Instrument packaging that shows wet or torn pouches after sterilization should be:

Opened carefully and items used if not visibly contaminated
Used immediately since sterilization already occurred
Stored separately and used within 24 hours
Re-sterilized in new packaging after re-cleaning (Correct answer)

Correct answer: Re-sterilized in new packaging after re-cleaning

Wet or compromised packaging indicates a breach in sterility; instruments must be reprocessed from the cleaning step in new intact packaging before use.

Question 93: What does the term 'wettability' mean in the context of dental adhesive materials?

The ability of a liquid material to spread over and contact a surface (Correct answer)
The hydrophilicity of dentin bonding agents in wet conditions
The material's resistance to dissolution in oral fluids
The water absorption capacity of a cured resin

Correct answer: The ability of a liquid material to spread over and contact a surface

Wettability describes how well a liquid spreads across a surface; materials with low contact angles spread readily, promoting intimate contact and adhesion.

Question 94: During periodontal probing, what does a bleeding on probing (BOP) positive score primarily indicate?

Pocket depth exceeds 4 mm
Gingival tissue inflammation is present (Correct answer)
Active bone loss is occurring
Subgingival calculus is present

Correct answer: Gingival tissue inflammation is present

BOP is a reliable indicator of gingival inflammation because inflamed sulcular epithelium is ulcerated and bleeds upon gentle probing.

Question 95: A dental hygienist is preparing to perform a procedure that is expected to generate significant aerosols. According to CDC guidelines for standard precautions, what is the correct sequence for donning (putting on) Personal Protective Equipment (PPE)?

Eyewear, Gown, Mask, Gloves
Gloves, Gown, Mask, Eyewear
Gown, Mask, Eyewear, Gloves (Correct answer)
Mask, Gown, Eyewear, Gloves

Correct answer: Gown, Mask, Eyewear, Gloves

The CDC recommends a specific sequence for donning PPE to minimize self-contamination. The correct order is gown first, then mask or respirator, followed by goggles or face shield, and finally gloves. This sequence generally moves from the body upwards, with gloves being applied last.

Question 96: A patient completes non-surgical periodontal therapy. Four weeks later, the dental hygienist performs a re-assessment, comparing the initial probing depths and bleeding scores with the current findings. This action is a critical part of which phase of the process of care?

Planning
Evaluation (Correct answer)
Implementation
Re-assessment

Correct answer: Evaluation

The evaluation phase is where the dental hygienist measures the extent to which the goals set in the care plan have been achieved. [9, 16] This involves collecting new data and comparing it to the baseline assessment data to determine the success of the implemented interventions and to plan for future care. [1]

Question 97: During a periodontal assessment, the clinical attachment level (CAL) is calculated by:

Measuring the distance from the CEJ to the base of the pocket only
Averaging the six probing depths per tooth
Adding probing depth to recession or subtracting pseudopocket depth from probing depth (Correct answer)
Subtracting probing depth from the gingival margin measurement

Correct answer: Adding probing depth to recession or subtracting pseudopocket depth from probing depth

CAL = probing depth + recession when the gingival margin is apical to the CEJ, or CAL = probing depth − pseudopocket when the margin is coronal.

Question 98: The 'toe-third' of a curette blade should be adapted against the tooth surface to avoid tissue trauma. How much of the blade should contact the tooth?

The entire length of the cutting edge
The terminal 1–2 mm (toe-third) (Correct answer)
The middle third only
Only the heel of the blade

Correct answer: The terminal 1–2 mm (toe-third)

Adapting only the toe-third of the curette ensures the sharp toe does not lacerate adjacent soft tissue.

Question 99: The inferior alveolar nerve is a branch of which division of the trigeminal nerve?

Maxillary (V2)
Ophthalmic (V1)
Both V2 and V3
Mandibular (V3) (Correct answer)

Correct answer: Mandibular (V3)

The inferior alveolar nerve is a branch of the mandibular division (V3) of the trigeminal nerve, providing sensation to the mandibular teeth and chin.

Question 100: The legal document that grants a dental hygienist permission to practice is called a:

Registration
License (Correct answer)
Certification
Permit

Correct answer: License

A license is the legal credential issued by a state dental board that authorizes a dental hygienist to practice in that state.

ADEX Dental Hygiene Exam

The ADEX Dental Hygiene Exam exam validates essential knowledge and skills required for certification or licensure in this field.

100

Questions

120 min

Time Limit

75%

To Pass

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