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retainer, extracoronal |
ancoraggio extracoronale |
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| 1. a type of retainer in which the preparation and its cast restoration lie largely external to the body of the coronal portion of the tooth and complement the contour of the crown. The retention or resistance to displacement is developed between the inner surfaces of the casting and the external walls of the prepared tooth. The extracoronal retainer may be a partial crown or a complete crown. 2. a direct retainer of the clasp type that engages an abutment tooth on its external surface in such a way as to afford retention and stabilization to a removable partial denture; a direct retainer of the manufactured type, the male portion of which is attached to the external surface of a cast crown on an abutment tooth (e.g., Dalbo and Crismani attachments). |
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