Posterior peripheral seal distortion related to processing temperature.

A conventional acrylic resin was processed at temperatures varying from 135 degrees F to 180 degrees F. No significant distortion in the posterior peripheral seal of a denture base was noted when the material was processed at or below the manufacturer's recommended temperature. Statistically significant distortion was noted in the posterior peripheral seal of a denture base when processing was done above the recommended temperature. An acrylic resin specially designed to be boiled produced significantly less distortion in a denture base than the conventional acrylic resin.