Analysis of strain gage method for comparisons of polymerization shrinkage and stress of dental restorative composite resins
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The aims of this study were to measure the linear polymerization shrinkage and microhardness of recently developed dental restorative composite resins and compare it with those of conventional methacrylate-based dental composite resins. Two methacrylate-based composites (Z100, Z350 flowable) and two recently developed composite (Venus®(Heraus,Germany), SDRTM(Densply,Germany)) were investigated. The polymerization shrinkage and stress of the composites during light curing was measured with the strain gage method and surface microhardness was measured with Micro Hardness Tester(JT Toshi Inc, Japan). The shrinkage of SDRTM was the lowest, and that of Z350 flowable was the highest. Peak polymerization shrinkage rate was the lowest in SDRTM and the highest in Z350 flowable. Among materials, Z100 showed significantly higher micro hardness than any other materials after curing(p<0.05). Micro hardness of SDR showed higher value than that of Venus, Z350 but no significant difference(p<0.05)
Abstract
The aims of this study were to measure the linear polymerization shrinkage and microhardness of recently developed dental restorative composite resins and compare it with those of conventional methacrylate-based dental composite resins. Two methacrylate-based composites (Z100, Z350 flowable) and two recently developed composite (Venus®(Heraus,Germany), SDRTM(Densply,Germany)) were investigated. The polymerization shrinkage and stress of the composites during light curing was measured with the strain gage method and surface microhardness was measured with Micro Hardness Tester(JT Toshi Inc, Japan). The shrinkage of SDRTM was the lowest, and that of Z350 flowable was the highest. Peak polymerization shrinkage rate was the lowest in SDRTM and the highest in Z350 flowable. Among materials, Z100 showed significantly higher micro hardness than any other materials after curing(p<0.05). Micro hardness of SDR showed higher value than that of Venus, Z350 but no significant difference(p<0.05)
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