title: Effect of air abrasives on marginal configurations of porcelain-fused-to-metal alloys: an SEM analysis.
abstract: Air abrasion of castings for metal ceramic crowns is a routine procedure in ceramics laboratories for cleaning, seating, and preparing casts for porcelain application. This technique can result in damage to the margins of castings. This investigation evaluated the extent and significance of this procedure. Marginal abrasion ranged from 5 to 110 microns. ANOVA, followed by Tukey's post hoc evaluation revealed no difference between abrasives, but significant differences were noted among alloys and margin configurations (p less than 0.05). Marginal loss by alloy was as follows: [Jelenko O] greater than [Olympia = Cameo] greater than [Jelstar] greater than [Genesis II]. Marginal loss by marginal configuration was as follows: [beveled shoulder] greater than [chamfer = shoulder]. Significant marginal damage can occur during air abrasion of dental castings.
authors.affiliation: Department of Prosthodontics, University of North Carolina, School of Dentistry, Chapel Hill.
authors.forename: D A
authors.initials: DA
authors.lastname: Felton
authors.forename: S C
authors.initials: SC
authors.lastname: Bayne
authors.forename: B E
authors.initials: BE
authors.lastname: Kanoy
authors.forename: J T
authors.initials: JT
authors.lastname: White
mesh_terms: D000388:Air; D000537:Aluminum Oxide; D002858:Chromium Alloys / Q000737:chemistry; D003442:Crowns; D003722:Dental Alloys / Q000737:chemistry*; D003737:Dental Cavity Preparation; D003775:Dental Polishing / Q000295:instrumentation / Q000379:methods*; D003776:Dental Porcelain / Q000737:chemistry*; D005898:Glass; D006047:Gold Alloys / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D006047:Gold Alloys; D003776:Dental Porcelain; D000537:Aluminum Oxide