Abstract
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 (p<0.05). Water sorption showed no difference between cycles (p>0.05) and impact strength presented difference between brands in short cycle (p<0.05). 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.
Highlights
The polymerization of acrylic resin starts by the decomposition of benzoyl peroxide molecule, resulting in two free radicals
Hardness, specific mass, soluble fraction and solubility were statistically significant between cycles and brands (p
Water sorption showed no difference between cycles (p>0.05) and impact strength presented difference between brands in short cycle (p
Summary
The polymerization of acrylic resin starts by the decomposition of benzoyl peroxide molecule, resulting in two free radicals. This decomposition occurs with energy absorption, generated by heat, chemical reaction or microwave energy. In 1968 [1], the polymerization of acrylic resin by microwave energy was introduced. Polymerization process occurs in an electromagnetic field where molecules vibrate and rapidly change the direction resulting in intermolecular collisions and heat generation [2,3]. The microwave energy method was introduced in dental practice as an alternative to the conventional heat process method [5]. Microwave energy method provided low polymerization time without changing material properties when compared to heat polymerized method [8]. Polymer results at lower distortions with characteristics and properties as hardness, flexural strength and porosity were better or not different from heat acrylic resin [9] due to microwave method allows homogeneous heating
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