Influence of polymerization cycle in properties of acrylic resin polymerized by microwave energy

摘要

Objective: The purpose of this study was to evaluate the physicochemical properties of acrylic resin?polymerized by microwave energy in short cycle of polymerization. Methods: Two brands (Classico and VIPI) and two cycles were evaluated (manufacturer cycle and?short cycle). The characteristics and properties as degree of conversion, glass transition temperature,?impact strength-Izod, Knoop hardness, swelling degree, soluble fraction, specific mass, water?sorption and solubility were evaluated. Results: Glass transition temperature, hardness, specific mass, soluble fraction and solubility were?statistically significant between cycles and brands (p0.05). Water sorption showed no difference?between cycles (p0.05) and impact strength presented difference between brands in short cycle?(p0.05). Acrylic resin polymerized by microwave energy with manufacturer cycle presented no?difference in physicochemical properties between evaluated brands.?Conclusion: The short cycle of polymerization showed reduced properties in microwave acrylic?resin when compared to manufacturer cycle. Manufacturer cycle of polymerization should be used?to acrylic resin devices production.