DDS Prosthodontics and Restorative Dentistry 3

Question 1

The caries-detecting dye used during cavity preparation stains which tissue?

Accepted Answer

Denatured (infected, non-vital) dentin collagen that cannot remineralize

Answer

Caries detector dye (1% acid red in propylene glycol) stains denatured, irreversibly infected dentin collagen that should be removed, while sparing affected but remineralizable inner dentin.

Question 2

Which cement provides the best seal against microleakage when used as a base under amalgam restorations?

Accepted Answer

Glass ionomer cement

Answer

Glass ionomer cements bond chemically to tooth structure, release fluoride, and exhibit minimal microleakage, making them superior bases/liners under amalgam.

Question 3

The Ante's Law in fixed partial denture design states that:

Accepted Answer

The combined root surface area of abutment teeth must equal or exceed that of the teeth being replaced

Answer

Ante's Law holds that the combined periodontal ligament area (root surface area) of abutment teeth should be equal to or greater than that of the teeth being replaced by the pontic(s).

Question 4

Which type of impression material is dimensionally most stable over time and most accurate for implant-level impressions?

Accepted Answer

Polyether

Answer

Polyether impression materials have excellent dimensional stability, low water sorption/solubility, and high stiffness, making them the gold standard for implant-level and precision fixed prosthodontic impressions.

Question 5

In Class V composite resin restorations, which factor most contributes to marginal failure at the gingival margin?

Accepted Answer

Poor bonding to cementum/dentin and flexural stress from toothbrushing (abfraction)

Answer

Class V cervical restorations fail primarily due to inadequate dentin bonding (cementum has no enamel rods to etch) combined with flexural stress from occlusal loads (abfraction) at the cervical fulcrum.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Prosthodontics and Restorative Dentistry 3