CIT CIT Prosthetic Components & Restoration 4

Question 1

Which type of implant-supported prosthesis uses a metal bar connecting multiple implants to support a removable overdenture?

Accepted Answer

Bar-retained overdenture

Answer

A bar-retained overdenture uses a metal bar spanning multiple implants, with clips or attachments in the denture that snap onto the bar for retention.

Question 2

When fabricating a zirconia implant crown, which factor is most critical to account for during milling to ensure accurate final fit?

Accepted Answer

Sintering shrinkage compensation (approximately 20-25%)

Answer

Zirconia must be milled oversized by approximately 20-25% to compensate for the shrinkage that occurs during the sintering process.

Question 3

A patient has a single-unit implant crown with a 5 mm emergence profile. Which abutment height is most appropriate for a cement-retained restoration with 2 mm of soft tissue?

Accepted Answer

2 mm abutment height

Answer

When soft tissue is 2 mm, a 2 mm abutment height ensures adequate cement retention while keeping the margin accessible for cement removal.

Question 4

What is the primary purpose of a custom impression coping in implant prosthodontics?

Accepted Answer

To replicate the exact soft tissue contour around the implant in the final impression

Answer

Custom impression copings capture the unique gingival contours that have been shaped during the provisional restoration phase, ensuring the master cast replicates the actual peri-implant tissue architecture.

Question 5

In an All-on-4 implant-supported prosthesis, the two posterior implants are typically angled at approximately how many degrees from vertical?

Accepted Answer

30–45 degrees

Answer

Posterior implants in the All-on-4 concept are typically angled 30–45 degrees to maximize bone contact, avoid anatomical structures, and extend the posterior cantilever support.

(CIT) Certified Implantology Technician Practice Test

(CIT) Certified Implantology Technician Practice Test

CIT CIT Prosthetic Components & Restoration 4