AGD Prosthodontics: Fixed and Removable 5

Question 1

Which of the following is the MOST important property of a die stone used for crown fabrication?

Accepted Answer

Low setting expansion and high compressive strength

Answer

Die stone requires minimal setting expansion (to maintain accuracy) and high compressive strength to withstand waxing and die trimming without fracture.

Question 2

A patient in centric occlusion shows heavy contact on the mesial incline of an upper molar cusp and the distal incline of a lower molar cusp. This type of premature contact is classified as:

Accepted Answer

A DURD (distal upper, mesial lower) contact in centric relation

Answer

A premature contact on the distal incline of an upper cusp (DUML) or mesial lower sliding distally from CR to CO is characterized as a DURD/CR discrepancy contact.

Question 3

All-ceramic crowns are considered contraindicated in which clinical situation?

Accepted Answer

Patients with documented bruxism and heavy posterior occlusal forces

Answer

Patients with bruxism generate extreme occlusal forces that can fracture all-ceramic restorations, particularly in the posterior region where forces are greatest.

Question 4

The major connector for a maxillary removable partial denture should:

Accepted Answer

Be rigid and positioned at least 6 mm from the gingival margins

Answer

A rigid major connector is essential for force distribution, and placement at least 6 mm from gingival margins prevents tissue irritation and gingival inflammation.

Question 5

The primary advantage of using a custom impression tray over a stock tray for a crown impression is:

Accepted Answer

Custom trays provide uniform thickness of impression material around the prepared tooth

Answer

Uniform material thickness in a custom tray reduces dimensional distortion and shrinkage variation, resulting in a more accurate impression of the preparation and margins.

(AGD) Academy of General Dentistry Certification Practice Test

(AGD) Academy of General Dentistry Certification Practice Test

AGD Prosthodontics: Fixed and Removable 5