An in vitro model has been developed simulating a composite laminate veneer restoration, along with methods to mimic the environmental conditions to which these restorations are subjected in vivo. Fifty composite laminate specimens were prepared: Ten were left untreated as controls, and 40 were exposed to simulated environmental conditioning. The tensile bond strength of the veneer-to-composite interface was significantly reduced by both thermal and humidity cycling, which may explain the increasing prevalence of marginal failure and staining which occurs as these restorations age in vivo.
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