PMID: 26877737Feb 16, 2016Paper

Water Sorption and Flexural Strength of Thermoplastic and Conventional Heat-Polymerized Acrylic Resins

Journal of Dentistry
Mohammad Ali HemmatiHanif Allahbakhshi

Abstract

The aim of this study was to assess and compare the water sorption and flexural strength of thermoplastic and conventional acrylic resins. Water sorption and flexural strength were compared between a thermoplastic modified polymethyl methacrylate (PMMA) denture base resin (group A) and a heat-polymerized PMMA acrylic resin (group B) as the control group (n=10). A three-point bending test was carried out for flexural strength testing. For water sorption test, 10 disc-shaped samples were prepared. After desiccating, the samples were weighed and immersed in distilled water for seven days. Then, they were weighed again, and desiccated for the second and third times. Differences between the mean values in the two groups were analyzed using Student's t-test. The mean value of water sorption was 14.74±1.36 μg/mm(3) in group A, and 19.11±0.90 μg/mm(3) in group B; this difference was statistically significant (P< 0.001). The mean value of flexural strength was 88.21±8.63 MPa in group A and 77.77±9.49 MPa in group B. A significant difference was observed between the two groups (P= 0.019). Flexural strength of group A was significantly higher than that of group B, and its water sorption was significantly lower. Thus, thermoplastic resins ...Continue Reading

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