Abstract
0 ne of the shortcomings of restorative materials is the phenomena of leakage around the margin of the restorations. In fillings, this phenomena is attributed to the differences between the thermal coefficient of expansion of the tooth, the restorative material, and the fluid occupying the marginal space.l This marginal seepage is probably a greater problem with resin restorations than with other materials2 1,eakage also occurs at the margins of acrylic resin facings in full veneer crowns.3* 4 Such leakage might lead to discoloration, loosening, and ultimate loss of the facing. There is no argreement as to which curing method provides the best cured acrylic resint This study was designed to examine some of the most commonly used curing methods in order to determine which of them would produce the least leakage at the margins of the acrylic resin facings in simulated veneer crowns.
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