Flexural strength of methacrylate and bis-acrylate based resins submitted to thermo cycling

rounesp Revista de Odontologia da UNESP Rev. odontol. UNESP 0101-1774 1807-2577 Universidade Estadual Paulista Júlio de Mesquita Filho Araraquara, SP, Brazil PURPOSE: This study aimed to evaluate the flexural strength of four resins used for temporary prosthesis after thermo cycling. METHOD: Luxatemp and Structur 2, bis-acryl based resins and, Duralay and Alike, methacrylate based resins, were used. Twenty specimens of each material were confectioned and divided in two groups. The specimens were submitted to the follow conditions: Group I - 24 hours of storage in artificial saliva and, Group II - 24 hours of storage in artificial saliva followed by thermo cycling (2000 cycles, 5 °C-55 °C). Each specimen was carried to flexural strength test in an Universal Testing Machine (EMIC DL 10000) and the results were statistically verified with ANOVA two-way followed by the Tukey test (p < 0.05). RESULT: The flexural strength of bis-acryl based resins was statistically superior to methacrylate based materials after both times of storage; however, they did not differ among themselves after 24 hours (p = 0,3594). The Luxatemp resin presented the higher flexural strength values after thermo cycling, being statistically superior to the others. The thermo cycling process influenced the flexural strength of all the materials evaluated, decreasing their flexural strength (p = 0,001). CONCLUSION: The bis‑acryl resins present superior flexural strength than the methacrylate ones. All materials evaluated have its flexural strength influenced by the thermo cycling process. 1 1. Ha JY, Kim SH, Kim KH, Kwon TY. Influence of the volumes of bis-acryl and poly(methyl methacrylate) resins on their exothermic behavior during polymerization. Dent Mater J. 2011; 30:336-42. 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