DMD Prosthodontics and Restorative Dentistry 2

Question 1

What minimum ferrule height of sound tooth structure is generally recommended for an endodontically treated tooth receiving a crown?

Accepted Answer

1.5–2.0 mm

Answer

A ferrule of 1.5–2.0 mm of vertical sound dentin above the finish line greatly improves fracture resistance.

Question 2

According to Gargiulo's classic study, the average combined dimension of the junctional epithelium and supracrestal connective tissue attachment (biologic width) is approximately:

Accepted Answer

2.04 mm

Answer

Gargiulo reported about 0.97 mm epithelial attachment plus 1.07 mm connective tissue attachment, totaling about 2.04 mm.

Question 3

What is the optimal crown-to-root ratio for a fixed partial denture abutment?

Accepted Answer

2:3

Answer

A 2:3 crown-to-root ratio is considered optimal, while 1:1 is the minimum acceptable.

Question 4

Ante's law states that the combined pericemental (root surface) area of abutment teeth should be:

Accepted Answer

Equal to or greater than that of the teeth being replaced

Answer

Ante's law requires abutment root surface area to equal or exceed that of the missing teeth to be replaced.

Question 5

Which pontic design is most appropriate for a mandibular first molar space where esthetics is not a concern and hygiene is the priority?

Accepted Answer

Sanitary (hygienic)

Answer

The sanitary pontic has no ridge contact, leaving about 3 mm clearance for easy cleaning in non-esthetic posterior areas.

DMD - Doctor of Medicine in Dentistry Practice Test

DMD - Doctor of Medicine in Dentistry Practice Test

DMD Prosthodontics and Restorative Dentistry 2