The Influence of Dentin Sealing with self-etch Adhesive on Polymerization of Silicone Impression Material

Abstract

Introduction: The purpose of this study was to determine the effect of dentin sealing agents on curing process of polyvinyl siloxane impression material.

Method: Thirty six carries free human molar teeth were vertically imbedded in plastic tube, leaving clinical crown evenly exposed above the potting surface (resin surface). Occlusal of them were removed perpendicular to the long axis and flat surfaces of dentin were exposed with a slow speed diamond saw. The specimens were divided into 3 groups (n = 12) according to surface treatments: no treatment (group 1); sealing with self-etching system Xeno V plus (group 2); sealing with self-etching Single bond universal (group 3). After bonding agent applying, the specimens were cured with visible light curing unit then polyvinyl siloxane impression material was mixed and applied on dentin surface and left it 10 minutes. All the process that described above were performed in nitrogen chamber. The impression materials were removed from specimens and examined by the naked eye and the stereo microscopy. The remaining two specimens from each group were subject to analyze element on dentin surface by EDMX function of scanning electron microscopy.

Results: From visual detection by naked eye and stereo microscopy, one hundred percent of impression materials at interface attached to bonding agent in group 2 were inhibited the curing process whereas in group 1 and group 3 the impression materials were complete curing. For EDMX analysis, sulfur elements were found on sealed dentin in group 2 only.

Discussion and Conclusion: Xeno V plus self-etch adhesive affected the curing process of polyvinyl siloxane impression material.