Influence of Polymerization Technique and Resin Type in Denture Misfit

The aim of this study was to analyze the misfit of dentures polymerized by two methods: a water bath at fast cycle at 100 °C and 50lb pressure, and microwave energy, using specific resins for each technique. Ten maxillary complete dentures were prepared with Lucitone 550 and Vipi Wave resin (n=5). For standardization of samples in a single model, the teeth setting up and wax-up were made, with subsequent molding using silicone rubber for mold. The samples were embedded in flasks and the resin was pressed according to manufacturer instructions. After polymerization, they were subjected to sudden cooling, dipped in 10ºC water. The pattern-prosthesis group was cut-off in canines and premolars distal region. The misfit analysis was performed by two calibrated examiners in positions: buccal (b), top of the alveolar ridge (TR) and anterior (mid-anterior third of the palate) and posterior (near the limit soft palate / hard palate).), with the aid of a stereoscopic microscope. Data were subjected to statistical analysis ANOVA 3-way and Tukey's test with significance level of 5%. Results showed that in millimeters there was no significant difference between the anterior and posterior regions. The anterior position analysis influenced the misfit. The polymerization techniques and type of resin showed no significant differences. It can be concluded that the technique of polymerization and the type of resin used did not differ from each other in the misfit of the denture base. The posterior region of the palate area showed greater misfit.