CIT Implant Materials & Techniques 3 — Questions and Answers
Question 1: Socket shield technique involves retaining which portion of a tooth root during immediate implant placement?
- The apical third
- The buccal root fragment (Correct answer)
- The entire root with PDL
- The palatal root only
Correct answer: The buccal root fragment
The socket shield technique retains the buccal root fragment to preserve the bundle bone and buccal plate, preventing labial contour collapse.
Question 2: Platform switching in implant prosthetics refers to:
- Changing implant platforms between manufacturers
- Using a narrower-diameter abutment than the implant platform (Correct answer)
- Switching from internal to external hex connection
- Alternating between tissue-level and bone-level designs
Correct answer: Using a narrower-diameter abutment than the implant platform
Platform switching uses an abutment with a smaller diameter than the implant platform, shifting the microgap inward and preserving crestal bone.
Question 3: Which cement property is most critical when selecting cement for cement-retained implant crowns?
- High compressive strength
- Retrievability and low film thickness (Correct answer)
- Maximum adhesive bond strength
- Radiolucency on periapical films
Correct answer: Retrievability and low film thickness
Retrievability is essential to manage biological complications, and low film thickness prevents excess cement from extruding into the peri-implant sulcus.
Question 4: The Morse taper (cone-in-cone) implant-abutment connection achieves its seal primarily through:
- Friction locking via cold welding (Correct answer)
- Screw preload alone
- External hex interlocking
- Cement bonding at the interface
Correct answer: Friction locking via cold welding
The Morse taper connection uses friction locking (cold welding effect) at the conical interface, creating a bacterial-tight seal without relying solely on the screw.
Question 5: Zirconia implants are contraindicated in patients with:
- Titanium sensitivity
- Parafunctional habits such as bruxism (Correct answer)
- Controlled type 2 diabetes
- A history of bisphosphonate therapy less than 3 years ago
Correct answer: Parafunctional habits such as bruxism
Zirconia's lower fracture toughness compared to titanium makes it more susceptible to fracture under the high occlusal forces associated with bruxism.
Question 6: Guided bone regeneration (GBR) membranes function by:
- Directly stimulating osteoblast differentiation
- Excluding epithelial and connective tissue cells from the defect (Correct answer)
- Providing a scaffold for vascular invasion only
- Delivering growth factors to the regeneration site
Correct answer: Excluding epithelial and connective tissue cells from the defect
GBR membranes act as physical barriers that exclude faster-migrating epithelial and connective tissue cells, allowing slower osteogenic cells to populate the defect.
Question 7: Which drilling sequence step is most critical for preventing bone overheating during osteotomy preparation?
- Using sharp, single-use drills with copious irrigation (Correct answer)
- Increasing drill speed to reduce contact time
- Applying firm continuous pressure throughout
- Starting with the largest diameter drill first
Correct answer: Using sharp, single-use drills with copious irrigation
Sharp drills with copious saline irrigation dissipate heat effectively; bone necrosis occurs above 47°C and compromises osseointegration.
CIT Implant Materials & Techniques 3
Socket shield technique involves retaining which portion of a tooth root during immediate implant placement?