Occlusal vertical dimension changes in visible light-cured resin

On a twenty standard, identical edentulous upper and lower casts, an identical upper and lower waxed-up sets of dentures were constructed with same vertical dimension of occlusion. These waxed up dentures were divided into two equal groups. For group I, the dentures sets were processed in compression molding heat-cured acrylic resin denture base material. For group II, the denture sets were processed in visible light-cured denture base material. After processing the vertical dimension of occlusion was measured for every denture set in both groups. It was found that there was an increase in the vertical dimension of occlusion on group I and a decrease in the vertical dimension of occlusion in group II. Regardless of the direction of the changes in the vertical dimension of occlusion, it was found that there was a significant difference between the dimensional changes in both groups and the dimensional changes in the denture bases of group I was more than group II by 54.5%.