Direct retainers are flexible parts of the casting that are designed to engage undercuts on the abutment teeth to resist removal of the prosthesis and to help prevent dislodgement Copyright © all rights are reserved by majchrowicz m Optimum support of distal extension denture base is necessary as well as the use of flexible direct retention to prevent the torquing forces transmitted to the abutment teeth.
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The design of clasp for a distal extension rpd that helps preserve both the abutment teeth and the tissues of the edentulous ridge is described
The clasp assembly takes advantage of surveyed lingual undercuts to provide support, retention, and stability.
Retention is provided by one of the commercial preformed metal or nylon clips, which is contoured to fit the bar and is retained in a preformed metal housing or partially embedded by means of retention spurs or loops into the overlying resin denture base. This type of a removable partial denture may be worn for prolonged periods, in the meantime undergoing revision, modification to include additional teeth lost, or relining when such becomes necessary or advisable. Treaded endodontic post in flex type rpd for retention element
