Prosthetic Restoration Flashcards

Which impression technique captures the three-dimensional position of implants in the mouth using a tray that remains in the mouth during cast separation?

Answer: Open-tray (pick-up) impression

Open-tray (pick-up) impressions transfer impression copings out with the tray, providing more accurate positional transfer especially for multiple implants.

Digital implant impressions using intraoral scanners compared to conventional impressions offer:

Answer: Elimination of physical impression materials and improved patient comfort

Digital scan abutments and intraoral scanners eliminate messy impression materials and provide digital workflows directly to CAD/CAM fabrication.

An implant-supported fixed partial denture (implant bridge) requires at least how many implants per pontic to maintain appropriate force distribution?

Answer: Ideally one implant per tooth replaced, but minimum one at each end

Standard practice supports a bridge with at least one implant at each end of the span, though longer spans may require intermediate implants.

The emergence profile of an implant crown refers to:

Answer: The contour of the restoration as it emerges from the gum tissue

The emergence profile is the three-dimensional transition between the implant abutment and crown as it exits the peri-implant sulcus, affecting esthetics and hygiene access.

Which prosthetic material is most commonly used for implant-supported crowns in the posterior region due to its strength?

Answer: Monolithic zirconia

Monolithic zirconia is preferred posteriorly for its high fracture resistance, low chipping rate, and excellent wear properties under heavy occlusal load.

The screw access channel in a screw-retained implant crown is typically sealed with:

Answer: Polytetrafluoroethylene (PTFE) tape and composite

PTFE tape placed below a composite resin plug allows the access channel to be opened for retrieval while protecting the screw head.