Chen Liang, Kleverlaan Cornelis Johannes, Liang Kunneng, Yang Deqin
Attending Doctor, College of Stomatology, Chongqing Medical University, Chongqing, China.
Associate Professor, Department of Dental Materials Sciences, Academic Centre for Dentistry Amsterdam, University of Amsterdam and Free University, Amsterdam, The Netherlands.
J Prosthet Dent. 2017 Apr;117(4):552-558. doi: 10.1016/j.prosdent.2016.06.023. Epub 2016 Oct 17.
Polyvinyl siloxane impression material has been widely used as a lingual matrix for rebuilding missing tooth structure with composite resin. The composite resin is light polymerized in contact with the polyvinyl siloxane impression material. However, polyvinyl siloxane impression material has been shown to interact with other dental materials.
The purpose of this study was to assess the effect of polyvinyl siloxane impression materials on the polymerization of composite resins by assessing the Vickers microhardness and degree of conversion of polyvinyl siloxane.
The composite resins were light polymerized in contact with 3 polyvinyl siloxane impression materials (Flexitime Easy Putty; President Light Body; Xantopren L Blue) (n=8) and in contact with a matrix strip as the control group (n=8). Vickers microhardness and degree of conversion on contact surfaces were measured to evaluate the polymerization of composite resins. The depth of the effect was assessed by Vickers microhardness on section surfaces and observed with scanning electron microscopy. The results were analyzed by 1-way analysis of variance and the post hoc Tukey honest significant differences test (α=.05).
The Vickers microhardness and degree of conversion values on the contact surfaces of the experiment groups were significantly lower than those of the control group (P<.05); the Vickers microhardness values on the section surfaces indicated that there was no significant difference at the same depth of different groups (P>.05). The scanning electron microscope observation showed that an approximately 10-μm deep unpolymerized layer was found in the experimental group.
Polyvinyl siloxane impression materials have an inhibitory effect on the polymerization of the composite resins, but just limited to within approximately 10 μm from the surface in contact with the impression material.
聚乙烯基硅氧烷印模材料已被广泛用作舌侧基质，用于用复合树脂重建缺失的牙齿结构。复合树脂在与聚乙烯基硅氧烷印模材料接触时进行光聚合。然而，聚乙烯基硅氧烷印模材料已被证明会与其他牙科材料相互作用。
本研究的目的是通过评估聚乙烯基硅氧烷的维氏显微硬度和转化率，来评估聚乙烯基硅氧烷印模材料对复合树脂聚合的影响。
复合树脂与3种聚乙烯基硅氧烷印模材料（Flexitime Easy Putty；President Light Body；Xantopren L Blue）接触进行光聚合（n = 8），并与作为对照组的基质条接触（n = 8）。测量接触表面的维氏显微硬度和转化率，以评估复合树脂的聚合情况。通过截面表面的维氏显微硬度评估影响深度，并用扫描电子显微镜观察。结果采用单因素方差分析和事后Tukey诚实显著差异检验进行分析（α = 0.05）。
实验组接触表面的维氏显微硬度和转化率值显著低于对照组（P < 0.05）；截面表面的维氏显微硬度值表明，不同组在相同深度处无显著差异（P > 0.05）。扫描电子显微镜观察显示，实验组中发现了一个约10μm深的未聚合层。
聚乙烯基硅氧烷印模材料对复合树脂的聚合有抑制作用，但仅限于与印模材料接触表面约10μm范围内。
