title: Effect of imaging powders on the bond strength of resin cement.
abstract: The application and incomplete removal of a computer-aided design/computer-aided manufacture imaging powder may affect the dentin surface prior to bonding a ceramic restoration. The purpose of this study was to compare the effect of imaging powder residue on the shear bond strength of a self-adhesive resin cement to dentin. Mounted human third molars were sectioned coronally with a diamond saw to expose the dentin, which was then prepared with a diamond bur mounted in a custom jig. The dentin surface was sprayed with 3 different imaging powders. The 3 powder groups were then divided into 3 subgroups based on the method of powder removal: no rinse, 1-second rinse, and 10-second rinse. A control group was created that had no application of imaging powder. A self-adhesive resin cement was bonded to the surfaces and loaded to failure in a universal testing machine after 24 hours of storage. Data was analyzed with Kruskal-Wallis and Mann-Whitney nonparametric tests. The bonding to dentin surfaces of the powder groups that were rinsed for 1 or 10 seconds were not significantly different from each other or the nonpowdered control. The type of imaging powder did not significantly affect the bond strength. The nonrinsed powdered dentin surface had a significant reduction in bond strength compared to both the control and the rinsed powdered surfaces.
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Jordan
authors.forename: Clifton W
authors.initials: CW
authors.lastname: Bailey
authors.forename: Deborah L
authors.initials: DL
authors.lastname: Ashcraft-Olmscheid
authors.forename: Kraig S
authors.initials: KS
authors.lastname: Vandewalle
mesh_terms: D017076:Computer-Aided Design; D001840:Dental Bonding / Q000379:methods; D003761:Dental Impression Technique / Q000009:adverse effects*; D003764:Dental Materials / Q000627:therapeutic use; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D011208:Powders / Q000627:therapeutic use; D019279:Resin Cements / Q000378:metabolism*
chemical_list: D003764:Dental Materials; D011208:Powders; D019279:Resin Cements