Which rest type is the crescent rest?

Which rest type is the crescent rest?

• A. Occlusal rest
• B. Incisal rest
• C. Lug/ball rest
• D. Crescent rest

Answer: (D)

A crescent rest is a rest seat that is crescent-shaped and placed on the occlusal surface of a posterior abutment tooth. Its curved, crescent geometry lets it contact a broad portion of the occlusal table, distributing functional loads evenly and resisting tipping of the denture without removing excessive tooth structure. This shape is specifically chosen to fit the occlusal morphology and provide stable vertical support, unlike incisal rests (on the incisal edge) or lug/ball rests (on buccal/lingual surfaces). In short, the crescent rest is a crescent-shaped occlusal rest used on posterior teeth to achieve solid vertical support with minimal tooth preparation.

A crescent rest is a rest seat that is crescent-shaped and placed on the occlusal surface of a posterior abutment tooth. Its curved, crescent geometry lets it contact a broad portion of the occlusal table, distributing functional loads evenly and resisting tipping of the denture without removing excessive tooth structure. This shape is specifically chosen to fit the occlusal morphology and provide stable vertical support, unlike incisal rests (on the incisal edge) or lug/ball rests (on buccal/lingual surfaces). In short, the crescent rest is a crescent-shaped occlusal rest used on posterior teeth to achieve solid vertical support with minimal tooth preparation.