DDS Prosthodontics and Restorative Dentistry 2

Question 1

Porcelain-fused-to-metal (PFM) crowns most commonly fracture at which location?

Accepted Answer

Within the occlusal porcelain over functional contacts

Answer

At the metal-ceramic interface (cohesive failure)

Answer

At the facial margin-porcelain junction

Answer

At the connector between adjacent units in a bridge

Question 2

A ferrule effect in crown preparation refers to:

Accepted Answer

Encirclement of sound tooth structure above the cement margin by the crown walls

Answer

The use of a chamfer finish line to guide die-spacer application

Answer

The creation of a 1 mm shoulder preparation at the gingival finish line

Answer

Using dual-cure cement to bond the crown to dentin

Question 3

In dental implant terminology, osseointegration is defined as:

Accepted Answer

Direct structural and functional contact between living bone and the implant surface at the light microscopic level

Answer

The growth of bone into the macro-roughened surface of the implant fixture

Answer

Fibrous encapsulation of the implant by dense connective tissue

Answer

Integration of the abutment with the soft tissue cuff

Question 4

The occlusal scheme most commonly recommended for complete dentures is:

Accepted Answer

Lingualized occlusion or bilateral balanced occlusion

Answer

Canine-guided occlusion

Answer

Group function occlusion

Answer

Edge-to-edge bite

Question 5

The smear layer created during cavity preparation:

Accepted Answer

Can be modified or removed depending on the bonding system (total-etch vs. self-etch)

Answer

Improves adhesion of all bonding systems equally

Answer

Must always be completely removed before bonding

Answer

Has no effect on the bond strength of glass ionomer cements

Question 6

When replacing a missing mandibular first molar with a three-unit fixed bridge, the abutment teeth most commonly used are:

Accepted Answer

Second premolar and second molar

Answer

First premolar and third molar

Answer

Second premolar and first premolar

Answer

Canine and second molar