retentive arm

re·ten·tive arm

, retention arm
a flexible segment of a removable partial denture that engages an undercut on an abutment and is designed to retain the denture.

re·ten·tive arm

(rē-tentiv ahrm)
Flexible segment of a removable partial denture that engages an undercut on an abutment and is designed to retain denture.
Synonym(s): retention arm.