PENGARUH LAMA PEMANASAN PASCA POLIMERISASI DENGAN MICROWAVE TERHADAP MONOMER SISA DAN KEKUATAN TRANSVERSA PADA REPARASI PLAT GIGI TIRUAN RESIN AKRILIK

Repair of fractured denture usually done using cold cured acrylic because it is easier and faster, but sometimes cracks do shown again in the repaired section. This is due to cold cured acrylic's transverse strength is lower than heat cured one, as a result of the high amount of methylmethacrylate as residual monomer. The aim of this study was to investigate the effect of post-polymerization heat duration using microwave on residual monomer and transverse strength of repaired acrylic resin denture base. This study used forty rectangular samples (65x10x2.5 mm) of heat cured acrylic resin which were repaired with cold cured acrylic resin. Samples were divided into four groups which consisted of ten samples each. The sequence of the groups were in accordance of their post-polymerization heat duration using microwave which were 2, 3 and 4 minutes, well as the fourth group acted as control After samples were made in accordance with their provisions, they had their transverse strength measured using Universal Testing Machine (Pearson Panke Equipment Ltd., London). Measurement of the amount of residual monomer in the fractured samples were done with Gas Chromatograph (Shimadzu, Japan), by first reflux was performed. The data were analyzed to one-way ANOVA and continued by Least Significant Difference (LSD). The results showed that: 1) There was a significant difference in the amount of residual monomer between post-polymerization heat duration using microwave (p