FREE DMD Prosthodontics and Restorative Dentistry Questions and Answers

Question 1

A patient presents for the cementation of a monolithic zirconia crown on tooth #30.
The tooth preparation has a total occlusal convergence of 20 degrees and a 4mm axial wall height.
Which of the following cements would provide the most predictable and durable long-term result?

Accepted Answer

Resin cement with MDP monomer

Answer

Zinc phosphate

Answer

Glass ionomer cement

Answer

Resin-modified glass ionomer (RMGI)

Question 2

A patient requires a removable partial denture for a mandibular arch with missing teeth #19, 20, 21, 30, and 31. All other teeth are present. According to Kennedy's classification, how should this partially edentulous arch be classified?

Accepted Answer

Class III, modification 1

Answer

Class I

Answer

Class II, modification 1

Answer

Class IV

Question 3

A 55-year-old patient presents with a fractured maxillary central incisor that has been previously endodontically treated. To ensure long-term success of a new crown, the dentist emphasizes the need for a ferrule. Which of the following best describes the primary function of the ferrule?

Accepted Answer

To resist functional lever forces and protect the remaining tooth structure from fracture.

Answer

To improve the esthetics of the final crown by creating a better emergence profile.

Answer

To provide a hermetic seal against microleakage at the crown margin.

Answer

To increase the retention of the core buildup material within the pulp chamber.

Question 4

A dentist is preparing a mandibular first molar for a full gold crown. To achieve adequate retention and resistance form, what is the ideal total occlusal convergence (TOC) or taper for the axial walls?

Accepted Answer

10-22 degrees

Answer

0-2 degrees

Answer

25-30 degrees

Answer

Greater than 30 degrees

Question 5

A 28-year-old female patient desires a new crown on tooth #8 for esthetic reasons. She has a high smile line and is concerned about the potential for a dark line at the gingival margin. She has no metal allergies and no signs of bruxism. Which type of crown would be the most esthetic choice to address her specific concern?

Accepted Answer

All-ceramic crown

Answer

Full gold crown

Answer

Porcelain-fused-to-metal (PFM) crown

Answer

Monolithic zirconia crown

Question 6

A patient calls the office one day after the placement of a large MOD composite restoration on tooth #14, complaining of sharp, intermittent pain upon biting. The pain is not present otherwise. Which of the following is the most likely cause of this postoperative sensitivity?

Accepted Answer

Polymerization shrinkage causing cusp deformation and micro-gaps.

Answer

Chemical irritation of the pulp from the etching agent.

Answer

Galvanic shock between the composite and an adjacent amalgam restoration.

Answer

Irreversible pulpitis requiring endodontic therapy.