Abstract
A study was made to determine whether bonding of a direct filling resin to bovine enamel surfaces was increased by pretreating the surfaces with a 50% phosphoric acid solution for 60 seconds. Tensile strength tests were used to measure the bond strength of the resin to the enamel surface. Results indicated that the pretreatment with the 50% phosphoric acid significantly increased the bonding of the direct filling resin, and the use of a cavity sealer in conjunction with the acid etching enhanced the retention of the resin to the enamel surface. Further laboratory tests in which stress is applied to restorations, and a well-controlled clinical evaluation are needed to substantiate the findings in this study.
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