CIT CIT Prosthetic Components & Restoration 1 — Questions and Answers
Question 1: What is the primary function of an abutment in implant prosthetics?
- To anchor the implant to the bone
- To connect the implant fixture to the prosthetic crown (Correct answer)
- To provide occlusal support directly to opposing teeth
- To seal the implant from bacterial ingress
Correct answer: To connect the implant fixture to the prosthetic crown
The abutment serves as the connector between the implant fixture and the prosthetic crown or restoration.
Question 2: Which type of prosthetic restoration is supported by implants yet can be removed by the patient for cleaning?
- Fixed implant bridge
- Implant-supported overdenture (Correct answer)
- Screw-retained crown
- Cement-retained crown
Correct answer: Implant-supported overdenture
An implant-supported overdenture is a removable prosthesis that snaps onto implant attachments and can be removed by the patient for cleaning.
Question 3: What is the anatomical space called that forms between the implant abutment and the surrounding soft tissue, similar to a gingival sulcus?
- Biologic width zone
- Crestal gap space
- Peri-implant sulcus (Correct answer)
- Sulcular depth channel
Correct answer: Peri-implant sulcus
The peri-implant sulcus is the shallow crevice around the implant abutment created by the surrounding soft tissue attachment.
Question 4: Which retention method for implant crowns uses a screw passing through the restoration to secure it directly to the abutment?
- Cement-retained
- Screw-retained (Correct answer)
- Friction-retained
- Snap-on retained
Correct answer: Screw-retained
Screw-retained crowns are secured to the implant or abutment using a retention screw that passes through the occlusal surface of the restoration.
Question 5: What is the recommended torque range for tightening most implant abutment screws according to manufacturer guidelines?
- 5–10 Ncm
- 15–20 Ncm
- 25–35 Ncm (Correct answer)
- 40–50 Ncm
Correct answer: 25–35 Ncm
Most implant abutment screws are tightened to 25–35 Ncm as specified by manufacturers to prevent loosening while avoiding screw fracture.
Question 6: What material is typically used to seal the screw access hole in a screw-retained implant crown after final placement?
- Zinc oxide eugenol paste
- Gingival former silicone
- Composite resin or PTFE tape (Correct answer)
- Glass ionomer cement
Correct answer: Composite resin or PTFE tape
The screw access hole in a screw-retained crown is typically sealed with composite resin or PTFE (Teflon) tape to allow future access while protecting the retention screw.
CIT CIT Prosthetic Components & Restoration 1
What is the primary function of an abutment in implant prosthetics?