THE EFFECT OF DIFFERENT POLYMERIZATION PERIODS ON WATER SORPTION OF ACRYLIC RESINS

Purpose: the purpose of this study was to compare the water sorption of four different heat-polymerized acrylic resins which polymerized in a regular time and a period of two times the normal range. material and methods: heat-polymerized acrylic resins are qc-20, vertex, meliodent and paladent-20. water sorption was measured after 1 day, 1 week and 1 month. water sorption analyzed with two-way analysis of variance (anova) and duncan test. results: the results indicated that the values of water sorption for 1 week and 1 month was observed a significant difference between the groups. (p<0.01) the values of water sorption for the samples much polymerized, was significantly high. conclusion: different heat-polymerized acrylic resins showed different water sorption in case of polymerized in a regular time and a period of two times the normal range.