title: The marginal-ridge rest seat.
abstract: Natural canine crowns are preferred as abutments for removable partial dentures because of their root morphology and bony support. However, preparing the rest seat on the lingual surface of a mandibular canine risks perforating the enamel. An alternative rest-seat preparation, on the marginal ridge of the canine crown, conserves tooth structure and provides a rest seat of adequate length and depth to ensure support for a cast framework. To illustrate why this little-discussed rest-seat preparation has endured locally, the rationale and preparation of the marginal-ridge rest seat is discussed from both historical and clinical perspectives.
authors.affiliation: Department of Restorative Dentistry, University of Manitoba, Winnipeg. rmazurat@ms.umanitoba.ca
authors.forename: R D
authors.initials: RD
authors.lastname: Mazurat
mesh_terms: D003481:Cuspid; D000044:Dental Abutments; D006801:Humans; D008334:Mandible; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*