title: Marginal adaptation of porcelain margins in metal ceramic restorations.
abstract: The purpose of this study was to evaluate the marginal adaptation of all-porcelain labial margin metal ceramic crowns using a porcelain shoulder material containing a light-polymerizing resin and one that used a direct-lift technique. Conventional metal margin restorations served as controls. Scanning electron micrographs were made of a 1-mm mesiodistal width of the margin at midfacial and midlingual reference marks. Image processing and analysis techniques were accomplished using a computer. Statistical evaluation indicated that the mean labial marginal discrepancy of the control group was significantly less than that of either of the two porcelain shoulder methods.
authors.affiliation: Ohio State University.
authors.forename: N R
authors.initials: NR
authors.lastname: Chaffee
authors.forename: P S
authors.initials: PS
authors.lastname: Lund
authors.forename: S A
authors.initials: SA
authors.lastname: Aquilino
authors.forename: A M
authors.initials: AM
authors.lastname: Diaz-Arnold
mesh_terms: D000704:Analysis of Variance; D003442:Crowns; D003776:Dental Porcelain; D003779:Denture Design; D016876:Metal Ceramic Alloys; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties
chemical_list: D016876:Metal Ceramic Alloys; D003776:Dental Porcelain