CIT Prosthetics & Restoration Flashcards
7 cards from real CIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 CIT Prosthetics & Restoration flashcards as text
A laboratory technician must verify the fit of an implant framework before veneering. Which test best confirms passive fit at the bench?
Answer: Sheffield test (single-screw test) with tactile assessment at non-tightened joints
The Sheffield (single-screw) test isolates discrepancies by tightening one screw and checking for movement or gaps at others.
When fabricating an implant-supported overdenture with a ball attachment system, the housing is picked up in the denture intraorally. What material is placed around the ball before pick-up?
Answer: Activating resin (auto-polymerizing acrylic) to capture the housing in situ
Auto-polymerizing acrylic flows around the ball housing and polymerizes in place, securing the attachment within the denture base.
Which condition would most indicate converting a patient from a tooth-borne to an implant-supported prosthesis?
Answer: Excessive residual ridge resorption causing instability
Severe ridge resorption leads to denture instability and function loss, making implant retention clinically necessary.
A CAD/CAM zirconia abutment is milled from a pre-sintered puck and then sintered. Approximately how much does zirconia shrink during sintering?
Answer: 20–25%
Pre-sintered zirconia blanks are milled oversized by approximately 20–25% to compensate for sintering shrinkage.
In an implant-retained mandibular overdenture retained by two locator attachments, what is the primary stress distribution mechanism compared to a conventional complete denture?
Answer: Implants resist dislodging forces while the ridge still bears compressive occlusal loads
Locator attachments resist vertical dislodgement and horizontal rotation, but the mucosa and ridge still share compressive loading.
During the try-in of a metal-ceramic implant crown, the patient reports the bite feels high. Adjustment should begin by:
Answer: Marking occlusal contacts with articulating paper and reducing only heavy marks systematically
Systematic identification and selective reduction of heavy contacts prevents over-reduction and maintains proper occlusal relationships.
Which measurement guides the selection of emergence profile diameter when designing a custom implant abutment?
Answer: The mesiodistal tooth width at the cementoenamel junction of the natural contralateral tooth
The CEJ width of the contralateral natural tooth provides the target crown diameter that guides abutment emergence design.