CIT CIT Prosthetic Components & Restoration 2 — Questions and Answers
Question 1: What is a 'stock abutment' in implant dentistry?
- A pre-manufactured abutment made to standard dimensions by the implant manufacturer (Correct answer)
- A custom CAD/CAM-milled abutment specific to patient anatomy
- An abutment used exclusively for temporary restorations
- An abutment designed only for full-arch implant cases
Correct answer: A pre-manufactured abutment made to standard dimensions by the implant manufacturer
A stock abutment is a prefabricated, standardized component supplied by the implant manufacturer in set sizes and angulations.
Question 2: Which cement type is most commonly preferred for permanent cement-retained implant crowns due to its strength and retrievability?
- Zinc phosphate cement
- Polycarboxylate cement
- Resin-modified glass ionomer or resin cement (Correct answer)
- Zinc oxide eugenol cement
Correct answer: Resin-modified glass ionomer or resin cement
Resin-modified glass ionomer or resin cement is preferred for cement-retained implant crowns because it provides sufficient strength while allowing retrieval if needed.
Question 3: What is the purpose of the 'emergence profile' in implant prosthetics?
- To define the angle at which the abutment exits the bone
- To shape the soft tissue contour as the restoration emerges from the gingiva (Correct answer)
- To determine the torque settings for the abutment screw
- To measure the height of the implant above the bone crest
Correct answer: To shape the soft tissue contour as the restoration emerges from the gingiva
The emergence profile defines the contour of the restoration as it transitions from the implant platform through the soft tissue to the crown, influencing esthetics and peri-implant tissue health.
Question 4: Which full-arch implant restoration concept typically uses 4–6 implants to support a complete non-removable arch of teeth?
- Removable partial denture
- Implant-supported fixed full-arch bridge (Correct answer)
- Single-unit implant crown series
- Implant-retained flip denture
Correct answer: Implant-supported fixed full-arch bridge
An implant-supported fixed full-arch bridge (such as All-on-4) uses 4–6 implants to support a complete arch of teeth in a fixed, non-removable framework.
Question 5: What is the primary function of a healing abutment (healing cap) after implant placement?
- To permanently retain the final crown
- To guide and shape the peri-implant soft tissue during the healing period (Correct answer)
- To protect the implant fixture during osseointegration below the gumline
- To measure implant stability with resonance frequency
Correct answer: To guide and shape the peri-implant soft tissue during the healing period
A healing abutment is placed after implant surgery to guide and shape the peri-implant gingival tissue into the desired contour before the final restoration is fabricated.
Question 6: In implant prosthodontics, what does 'passive fit' of a prosthetic framework mean?
- The prosthesis fits loosely with minimal retention
- The framework seats completely on all abutments simultaneously without inducing internal stress (Correct answer)
- The prosthesis can be removed passively by the patient without tools
- The occlusal contacts are light enough to avoid parafunction
Correct answer: The framework seats completely on all abutments simultaneously without inducing internal stress
Passive fit means the implant-supported framework seats fully and simultaneously on all abutments without inducing mechanical stress in the prosthesis or the implants.
CIT CIT Prosthetic Components & Restoration 2
What is a 'stock abutment' in implant dentistry?