Reverse Action Clasp (hairpin clasp)
Posted on 12/09/2011
The reverse action clasp is a clasp assembly similar to the circumferential clasp except that the buccal clasp has a reverse shape similar to a hairpin. The assembly usually has a guide plate, occlusal rest, lingual bracing arm and buccal reverse action arm.
The reverse action clasp is used specifically in cases where:
1. The undercut is on the buccal
2. The tooth is adjacent to an edentulous space
3. Abutment has a mesial tilt (often used for mandibular molars)
The advantage of this clasp design is the retentive strength of the buccal arm. The major disadvantage is the extensive tooth surface coverage which may lead to caries.
The reverse action clasp is used specifically in cases where:
1. The undercut is on the buccal
2. The tooth is adjacent to an edentulous space
3. Abutment has a mesial tilt (often used for mandibular molars)
The advantage of this clasp design is the retentive strength of the buccal arm. The major disadvantage is the extensive tooth surface coverage which may lead to caries.
