Abstract
Statement of problem. Resin crowns appear to be increasingly at risk for increases in marginal gap size as a result of thermocycling and occlusal loading. Purpose. This in vitro study compared the effects of occlusal loading and thermocycling on the margins of provisional crowns made from a conventional autopolymerized provisional acrylic resin (Jet) to those made from a light-polymerized resin (Unifast LC). Methods And Material. Crowns made from the 2 materials were thermocycled and loaded on custom dies to simulate 6 to 8 weeks of oral function. Gap sizes were measured before and after thermocycling and occlusal loading. Results. Provisional crowns made from light-polymerized resin exhibited smaller changes in marginal gap size than did those made from conventional autopolymerized resin. Conclusions. The improved characteristics of the light-polymerized material may prove useful for provisional crowns that must remain for long periods in the oral environment. (J Prosthet Dent 1999;82:161-6.)
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