Which component is described as a flexible metal arm that grasps the tooth to retain the denture, possibly semi flexible for two-thirds of its length?

Which component is described as a flexible metal arm that grasps the tooth to retain the denture, possibly semi flexible for two-thirds of its length?

• A. Rest
• B. Retentive arm
• C. Bracing arm
• D. Minor connector

Answer: (B)

Retention in a removable partial denture mainly comes from clasps that grip the abutment tooth. The component described as a flexible metal arm that grasps the tooth to hold the denture is the retentive arm. It engages an undercut on the tooth so the denture resists being lifted out. The flexible portion allows some give as the denture is removed, often extending about two-thirds of the tooth length, which lets it grab the undercut securely without transmitting excessive stress to the tooth. The rest of the arm remains comparatively rigid to keep the denture properly seated and aligned. The other components have different roles: a rest provides vertical support and helps prevent vertical movement of the denture; a bracing arm helps stabilize and resist tipping or lateral forces but doesn’t primarily grip undercuts for retention; a minor connector links the denture base to the rest of the framework.

Retention in a removable partial denture mainly comes from clasps that grip the abutment tooth. The component described as a flexible metal arm that grasps the tooth to hold the denture is the retentive arm. It engages an undercut on the tooth so the denture resists being lifted out. The flexible portion allows some give as the denture is removed, often extending about two-thirds of the tooth length, which lets it grab the undercut securely without transmitting excessive stress to the tooth. The rest of the arm remains comparatively rigid to keep the denture properly seated and aligned.

The other components have different roles: a rest provides vertical support and helps prevent vertical movement of the denture; a bracing arm helps stabilize and resist tipping or lateral forces but doesn’t primarily grip undercuts for retention; a minor connector links the denture base to the rest of the framework.