AGD Fixed and Removable Prosthodontics 3

Question 1

Which retention mechanism is used for an implant-retained overdenture that allows the most movement (stress-breaking) of the prosthesis?

Accepted Answer

Ball-and-socket (stud) attachment

Answer

Ball-and-socket (stud) attachments allow multi-axial movement, providing the most stress-breaking action compared to more rigid attachment designs.

Question 2

What is the most critical factor in determining the path of withdrawal for a fixed partial denture (bridge) with multiple abutments?

Accepted Answer

Parallelism of abutment teeth

Answer

All abutment teeth must be parallel to one another along the chosen path of withdrawal so the fixed bridge can seat and be removed as a single unit.

Question 3

A sanitary (hygienic) pontic design is contraindicated in which clinical situation?

Accepted Answer

Anterior maxillary region where esthetics are critical

Answer

Sanitary pontics leave a visible gap between the pontic and ridge, making them unacceptable in the anterior maxilla where esthetics demand tissue contact.

Question 4

Which type of rest seat preparation is required for a reciprocal clasp located on the lingual surface of a molar in an RPD?

Accepted Answer

Lingual rest seat

Answer

A lingual rest seat is prepared on the lingual surface of posterior teeth to support a lingual reciprocal arm and resist vertical displacement.

Question 5

When using a stock tray for a complete denture final impression, which modification is essential to achieve adequate peripheral extension?

Accepted Answer

Adding border-molding material (compound or PVS) around the periphery

Answer

Border molding establishes the functional width and depth of the vestibular periphery so the final impression accurately captures the denture-bearing area.

(AGD) Academy of General Dentistry Certification Practice Test

(AGD) Academy of General Dentistry Certification Practice Test

AGD Fixed and Removable Prosthodontics 3