Basic Removable Partial Prosthodontic Terminology
Retainer is any type of clasp, attachment, device, etc used for the fixation, stabilization,, or retention of a prosthesis. A retainer maay be either intracoronal or extracoronal and can be used as a means of retaining either a removable or a fixed restoration.
Direct Retainer is that component of a removable partial denture used to retain or prevent dislodgement. It consists of a clasp assembly or precision attachment.
Clasp Assembly is the part of a removable partial denture that acts as a direct retainer and / or stabilizer for a prosthesis by partially encompassing or contacting an abutment.
Clasp (Direct Retainer) is the component of a clasp assembly that engages a portion of the tooth surface and either enters an undercut for retention or remains entirely above the height of contour to act as a reciprocating element.
Bar Clasp is a type of extracoronal retainer that originates from the denture base or framework, traverses soft tissue, and approaches the tooth undercut area from a gingival direction.
Reference
Carr A B, McGivney G P, Brown D T: McCracken’s Removable Partial Denture, ed 11, 2005, Mosby.
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