Silorane계 복합레진의 중합수축응력의 평가

Abstract

The purpose of this study was to evaluate the polymerization shrinkage stresses among conventional methacrylate-based composite resins and silorane-based composite resin. The strain guage method was used for the determination of polymerization shrinkage strain. Specimens were divided by 3 groups according to various composite materials. Conventional methacrylate-based composite resin; Filtek Z-250 (3M ESPE, St. Paul, MN, USA) and Filtek P-60 (3M ESPE, St. Paul, MN, USA); and silorane-based resin; Filtek P-90 (3M ESPE, St. Paul, MN, USA). 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).

The results were as follows:

1. All groups showed transient expansion just after irradiation of curing light. Shrinkage stress was increased rapidly at the early phase of polymerization and after 200 seconds reduced slowly as time elapsed. 2. The polymerization shrinkage stress of silorane-based composite resin showed lower than conventional methacrylate-based composite resin (p < 0.05). 3. Shrinkage stress in methacrylate-based composite resin groups did not show significant difference (p > 0.05).

The use of silorane-based composite resin may reduce polymerization shrinkage stress and subsequently reduce marginal leakage, which increase the risks of cuspal deflection, secondary-caries formation, and pulpal inflammation. But elastacity of modulus also should be considered before clinical application and we need to study more about silorane-based composite resin.