title: Marginal adaptation of castable ceramic crowns.
abstract: Tooth preparations and seating techniques of castable ceramic crowns differ from metal ceramic crowns. This study evaluated the variable effects of cementation on the marginal adaptation of Dicor, Cerestore, and porcelain-fused-to-metal crowns. The shoulder preparation was maintained for ceramic crowns, and a cavosurface bevel was designed for metal ceramic crowns. Crowns were made with a replication size of 10, placed on master dies, and the marginal openings measured with a Nikon Measurescope 20 instrument. Thirty crowns were cemented with zinc phosphate cement and the recommended clinical force. Marginal adaptation was not improved with a gingival bevel preparation or an increased seating force. The best marginal adaptation was recorded for Cerestore crowns.
authors.affiliation: Department of Restorative Dentistry, University of Washington, School of Dentistry, Seattle.
authors.forename: J D
authors.initials: JD
authors.lastname: Weaver
authors.forename: G H
authors.initials: GH
authors.lastname: Johnson
authors.forename: D J
authors.initials: DJ
authors.lastname: Bales
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D000704:Analysis of Variance; D002484:Cementation; D002516:Ceramics / Q000737:chemistry*; D003442:Crowns; D003737:Dental Cavity Preparation; D003776:Dental Porcelain / Q000737:chemistry*; D003779:Denture Design; D006801:Humans; D007180:Incisor; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D008953:Models, Anatomic; D011312:Pressure; D013314:Stress, Mechanical; D013499:Surface Properties; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: C047475:Dicor ceramic; D016876:Metal Ceramic Alloys; D003776:Dental Porcelain; D015036:Zinc Phosphate Cement; C050798:cerestore; D000537:Aluminum Oxide