Prosthodontics and Restorative Dentistry Flashcards

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

Answer: 1.5–2.0 mm

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

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

Answer: 2.04 mm

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

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

Answer: 2:3

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

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

Answer: Equal to or greater than that of the teeth being replaced

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

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

Answer: Sanitary (hygienic)

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

Which situation is the most accepted indication for a cantilever fixed partial denture?

Answer: Replacing a maxillary lateral incisor using the canine as abutment

A canine-retained cantilever replacing a maxillary lateral incisor is a classic indication because the canine has a long root and lateral pontic forces are low.

For a metal-ceramic crown, which facial finish line is most commonly recommended to allow adequate porcelain bulk?

Answer: Shoulder or shoulder with bevel

A facial shoulder (often with bevel) of about 1.0–1.5 mm provides room for metal and porcelain without overcontouring.