FREE NBDE Prosthodontics and Operative Dentistry Questions and Answers

Question 1

A patient with a Kennedy Class I removable partial denture complains that the denture lifts away from the tissue when they eat sticky foods.
Which component is specifically designed to counteract this rotational movement away from the tissues on the opposite side of the fulcrum line?

Accepted Answer

Indirect retainer

Answer

Major connector

Answer

Direct retainer

Answer

Denture base

Question 2

When preparing a posterior tooth for a full cast gold crown, what is the generally accepted ideal total occlusal convergence (taper) between opposing axial walls to provide adequate retention and resistance form?

Accepted Answer

6-10 degrees

Answer

0-2 degrees

Answer

25-30 degrees

Answer

15-20 degrees

Question 3

A patient complains of poor retention of their new maxillary complete denture, noting it frequently drops when they talk or yawn. Which of the following is the most critical factor for maintaining the peripheral seal and retention of a maxillary complete denture?

Accepted Answer

Proper placement of the posterior palatal seal

Answer

Anterior flange extension into the vestibule

Answer

Accurate replication of the rugae

Answer

Occlusal plane height

Question 4

Which of the following describes a G.V. Black Class II carious lesion?

Accepted Answer

Caries on the proximal surface of a posterior tooth

Answer

Caries in the pits and fissures of an occlusal surface

Answer

Caries on the gingival third of the facial or lingual surface

Answer

Caries on the proximal surface of an anterior tooth not involving the incisal angle

Question 5

The primary purpose of applying 37% phosphoric acid to enamel during an adhesive restorative procedure is to:

Accepted Answer

Remove the smear layer and create microporosities for mechanical retention

Answer

Disinfect the tooth surface to eliminate bacteria

Answer

Chemically bond directly to the hydroxyapatite crystals

Answer

Condition the dentin to promote collagen cross-linking

Question 6

Conventional glass ionomer cements (GICs) are composed of a powder and a liquid that undergo an acid-base reaction. The liquid component is primarily an aqueous solution of which acid?

Accepted Answer

Polyacrylic acid

Answer

Hydrochloric acid

Answer

Phosphoric acid

Answer

Maleic acid

A patient with a Kennedy Class I removable partial denture complains that the denture lifts away from the tissue when they eat sticky foods.Which component is specifically designed to counteract this rotational movement away from the tissues on the opposite side of the fulcrum line?

A patient with a Kennedy Class I removable partial denture complains that the denture lifts away from the tissue when they eat sticky foods.
Which component is specifically designed to counteract this rotational movement away from the tissues on the opposite side of the fulcrum line?