Comparación de cambios dimensionales en bases protésicas de acrílicos curados por calor y microondas

Abstract

Acrylic resins for denture bases must have a good dimensional stability during staying in the oral environment. Currently, with resin processing through microwaves it has been achieved to obtaining a better adaptability compared with the thermocuring method (compression). The objective was to observe the dimensional changes on 3 different brands of acrylic bases: Acron MC processed through microwave; Veracryl and Nic Tone, processed through thermocuring (compression). Thirty upper toothless models were made on which prosthesis base was waxed. They got flasked, unwaxed and processed according to manufacturer’s directions; obtaining this way, 10 samples of acrylic bases of each brands previously mentioned. Afterwards, they were sectioned, microscopically observed and photographed. Then, they were projected and an amplified image, was obtained on which the separation between acrylic and cast was rule-measured. In order to find out the difference among curing methods, an ANOVA test was used. Getting a p = 0.0604. Proving that there is no statistically significant difference between microwave Owen-polymerized acrylic resins and the thermocuring method-polymerized resins (compression), was achieved. However clinically the procedure through a microwave Owen showed better results in regards to dimensional stability, plus counts as a quick, clean and cheap method.