Influence of water immersion on porosity of acrylic resin polymerized by microwave energy

Marisa Bagiotto Rossato, Henrique Montagner, Patrícia Alves Scheid, Paulo Afonso Burmann, Katia Olmedo Braun


Purpose: The purpose of this investigation was to evaluate if immersion in water during polymerization would affect the porosity of acrylic resins polymerized by microwave energy.
Methods: Fifty specimens (20x20x5mm) were fabricated with two types of colorless acrylic resin (Vipi Cril® and Vipi Wave®). Group 1 (G1) specimens were polymerized by conventional hot water bath (12h at 74ºC), and the experimental groups (G2, G3, G4 and G5) were polymerized by microwave energy (cycle of 20min at 180W, plus 5min at 540W). Groups G2 and G4 were immersed in water during the polymerization cycle in a microwave oven, and G3 and G5 were polymerized without water immersion. Specimens were subjected to visual evaluation without magnification by one calibrated observer, using a score system of porosity with values ranging from 0 to 3 in ascending order.
Results: All specimens scored zero. The conventional resin (Vipi Cril liquid®) could be processed by microwave energy resulting no visible porosity.
Conclusion: The results showed that immersion in water during microwave polymerization did not influence acrylic resin porosity.
Key words: Acrylic resins; porosity; microwaves


Acrylic resins; porosity; microwaves

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e-ISSN: 1980-6523

ISSN-L: 0102-9460


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