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European Journal of Prosthodontics and Restorative Dentistry

An Investigation into the Effects of Metal Primer and Surface Topography on the Tensile Bond Strength Between Cobalt Chromium Alloy and Composite Resin

Abstract

Abstract - This study examined the influence of surface preparation and metal primer on the tensile bond strength between cobalt chromium alloy and composite resin. The bond strength between 168 cobalt chromium alloy dumbbells with one of three test surfaces (beaded, machined or sandblasted) to composite resin were tested. Half of each group were treated with metal primer. The weakest bond strength was produced by the unprimed machined surface, many specimens failing before testing. The metal primer increased the bond strengths of all groups tested. The greatest bond strengths were achieved with the primed beaded and sandblasted surfaces. Within the limits of the study it has been shown that the surface preparation of the cobalt-chromium alloy did influence tensile bond strengths with composite resin and Metal Primer II increased the tensile bond strengths for all groups tested. The sandblasted surface treated with Metal Primer II is recommended for the bonding of composite resin to cobalt chromium alloy.

KEY WORDS: primer, composite resin, surface, cobalt chromium, bond strength

Authors

David Newsum, Andrzej Juszczyk, Robert K.F. Clark, David R Radford

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