Abstract
This study investigated the effect of different microwave curing cycles on the changes in occlusal vertical dimension of complete dentures. Four test groups with 12 maxillary dentures each were evaluated. Groups 1, 2 and 3 were polymerized with different cycles by microwave radiation and Group 4 was the control and cured by water bath. The average pin opening for all groups was less than 0.5 mm. There was no significant difference between the groups polymerized by the microwave method and the control group. However, analyses of the vertical dimension changes showed statistically significant differences between groups 2 (0.276 +/- 0.141 mm) and 3 (0.496 +/- 0.220 mm).
Highlights
(methyl methacrylate) is the usual resin employed for manufacturing dentures
The results were analyzed by ANOVA at 95% level of confidence (p=0.05) and showed significant interaction between the polymerization cycles for changes of incisal pin opening of the processed complete dentures
The Tukey test for multiple comparisons was applied and no statistically significant differences were found between the control group and the three groups cured by microwave energy
Summary
(methyl methacrylate) is the usual resin employed for manufacturing dentures. Since its introduction over six decades ago, there has been a continual search to modify the processing procedures of the resin to improve physical and mechanical properties, and the working properties that facilitate laboratory techniques of denture construction.In evaluating new denture base materials and processing techniques, one important comparison is changes in the positions of artificial posterior teeth. Changes in occlusal vertical dimension during laboratory procedures of complete dentures are related to intrinsic characteristics of the materials and techniques. Such changes can be caused by packing and closing forces [1], various polymer and monomer systems, the differential coefficient of expansion between gypsum and acrylic resins, and polymerization shrinkage [2,3]. These differences can cause some incisal pin opening after processing when the dentures are remounted [49]
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