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http://dx.doi.org/10.5395/JKACD.2011.36.3.188

Evaluation of polymerization shrinkage stress in silorane-based composites  

Ryu, Seung-Ji (Department of Conservative Dentistry, Chosun University School of Dentistry)
Cheon, Ji-Hoon (Department of Conservative Dentistry, Chosun University School of Dentistry)
Min, Jeong-Bum (Department of Conservative Dentistry, Chosun University School of Dentistry)
Publication Information
Restorative Dentistry and Endodontics / v.36, no.3, 2011 , pp. 188-195 More about this Journal
Abstract
Objectives: The purpose of this study was to evaluate the polymerization shrinkage stress among conventional methacrylate-based composite resins and a silorane-based composite resin. Materials and Methods: The strain gauge method was used for the determination of polymerization shrinkage strain. Specimens were divided by 3 groups according to various composite materials. Filtek Z-250 (3M ESPE) and Filtek P-60 (3M ESPE) were used as a conventional methacrylate-based composites and Filtek P-90 (3M ESPE) was used as a silorane-based composites. Measurements were recorded at each 1 second for the total of 800 seconds including the periods of light application. The results of polymerization shrinkage stress were statistically analyzed using One way ANOVA and Tukey test (p = 0.05). Results: The polymerization shrinkage stress of a silorane-based composite resin was lower than those of conventional methacrylate-based composite resins (p < 0.05). The shrinkage stress between methacrylate-based composite resin groups did not show significant difference (p > 0.05). Conclusions: Within the limitation of this study, silorane-based composites showed lower polymerization shrinkage stress than methacrylate-based composites. We need to investigate more into polymerization shrinkage stress with regard to elastic modulus of silorane-based composites for the precise result.
Keywords
Methacrylate composite; Polymerization shrinkage stress; Silorane composite; Strain gauge;
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