CIT CIT Prosthetics & Restoration 2 — Questions and Answers
Question 1: What is the function of a healing abutment (cover screw) placed after stage-one implant surgery?
- To attach the final crown
- To shape the gingival tissue during osseointegration (Correct answer)
- To measure implant stability
- To deliver local anesthetic
Correct answer: To shape the gingival tissue during osseointegration
A healing abutment protrudes through the gingiva during the healing phase to maintain tissue shape and prepare the soft tissue profile before the final restoration.
Question 2: Which technique is used when insufficient inter-arch space exists for a standard abutment and crown?
- Using a wider-diameter implant
- Selecting a low-profile or angled abutment (Correct answer)
- Placing the implant deeper apically
- Changing to a one-piece implant
Correct answer: Selecting a low-profile or angled abutment
Low-profile or angled abutments are selected when vertical space is limited, allowing the prosthetic components to fit within the available inter-arch dimension.
Question 3: What does the term 'passivity of fit' mean in implant prosthetics?
- The implant is not active during osseointegration
- The prosthesis seats without inducing internal stress on implants (Correct answer)
- The abutment screw is loosened deliberately
- The crown margin fits below the gingiva
Correct answer: The prosthesis seats without inducing internal stress on implants
Passivity of fit means the framework or prosthesis seats completely on all implants simultaneously without generating internal stress or distortion.
Question 4: When torquing an abutment screw, the CIT should use a calibrated torque wrench set to the manufacturer's specification primarily to:
- Speed up the procedure
- Prevent screw loosening and fracture (Correct answer)
- Ensure the crown is cemented properly
- Determine implant depth
Correct answer: Prevent screw loosening and fracture
Applying the correct torque value prevents under-tightening (which causes loosening) and over-tightening (which can fracture the screw or damage the implant-abutment connection).
Question 5: A pink ceramic or gingiva-colored composite added to a prosthesis is primarily used to:
- Reinforce the metal framework
- Simulate lost gingival tissue for esthetic purposes (Correct answer)
- Prevent plaque accumulation
- Act as a shock absorber
Correct answer: Simulate lost gingival tissue for esthetic purposes
Pink esthetic materials replace missing gingival volume in cases of bone and soft tissue loss, restoring a natural appearance to the smile.
Question 6: Which type of implant prosthesis is removable by the patient but supported and retained primarily by implants?
- Fixed partial denture
- All-on-4 bridge
- Implant-supported overdenture (Correct answer)
- Porcelain-fused-to-metal crown
Correct answer: Implant-supported overdenture
An implant-supported overdenture is a removable prosthesis that clips or snaps onto implants for retention and support, allowing patient removal for cleaning.
CIT CIT Prosthetics & Restoration 2
What is the function of a healing abutment (cover screw) placed after stage-one implant surgery?