Interfacial strengths of various alloy surface treatments for resin-bonded fixed partial dentures

A practical method for bonding or rebonding the resin-bonded retainer is eagerly being sought by general practitioners. This research introduces a new test apparatus for evaluating bond strength of base metal alloys after various alloy surface treatments. Five commercial base metal alloys and a resin luting cement for resin-bonded fixed partial dentures were examined. Sandblasting, oxidation, or etching treatment were determined to be effective in increasing the adhesive strength for the tested alloys. No statistical differences between various surface treatments were found for bonding of Unitbond metal. Inexpensive sandblasting, along with ultrasonic washing, provided superior bonding strengths for Biobond II and Litecast B materials. Electrochemical treatment was suitable for Wiron 77 and Lab metals.