Effect of polymerization under pressure on dimensional changes of acrylic resin maxillary dentures

The aim of this study was to investigate the effect of increased curing pressure on the dimensional changes of acrylic maxillary denture. Twelve reference guides were used to measure the changes in the horizontal lateral, horizontal anteroposterior and vertical direction between the waxed and the processed dentures with each technique. The results showed a change in the lateral direction of 0.5%, 0.14%, in the anteroposterior direction of 0.53%, 0.26%, in the vertical direction of 0.098%, 0.25% for the conventional and pressure processing techniques, respectively. From this study, it could be concluded that the pressure polymerization techniques reduce the dimensional changes of acrylic resins significantly in all the measured directions