Selected physicochemical properties of the experimental endodontic sealer.
Selected physicochemical properties of the experimental endodontic sealer.
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DOI：
10.1007/s10856-009-3873-3
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发表时间：
2010-02
期刊：
影响因子：
--
通讯作者：
Skrtic D
中科院分区：
文献类型：
--
作者：
Johns JI;O'Donnell JN;Skrtic D
本研究探讨了用作根管封闭剂的实验性无定形磷酸钙(ACP)复合材料的吸水性、吸湿性、机械强度和离子释放。光固化(LC)和双固化(DC)树脂由氨基甲酸酯二甲基丙烯酸酯(UDMA)、甲基丙烯酸羟乙酯(HEMA)、邻苯二甲酸甲基丙烯酰氧乙酯(MEP)和高相对分子质量齐聚单体聚乙二醇缩UDMA(PEGU)(简称UPHM树脂)组成。为了制备复合材料，将质量分数为60%的UPHM树脂与质量分数为40%的现制(Am-)或研磨(g-)ACP混合。以玻璃填充复合材料作为对照。DC和LC ACP UPHM复合材料都表现出相对较高的吸水率，并伴随着显着的吸湿膨胀。后者可能有助于抵消在这些材料中形成的高聚合应力。实验材料的离子释放谱证实了它们有可能再生矿物质缺乏的牙齿结构。经过3个月的水浸泡后，其中等到低的机械强度并没有降低作为牙髓封闭剂的热情。对于这种应用，DC g-ACP复合材料似乎是最合适的，但需要进行微渗漏和定量浸出性研究，以充分确定它们的适用性。
This study explores water sorption, hygroscopic expansion, mechanical strength and ion release from the experimental amorphous calcium phosphate (ACP) composites formulated for application as endodontic sealers. Light-cure (LC) and dual-cure (DC; combined light and chemical cure) resins comprised urethane dimethacrylate (UDMA), 2-hydroxyethyl methacrylate (HEMA), methacryloyloxyethyl phthalate (MEP) and a high molecular mass oligomeric co-monomer, poly(ethyleneglycol)-extended UDMA (PEG-U) (designated UPHM resin). To fabricate composites, a mass fraction of 60% UPHM resin was blended with a mass fraction of 40% as-made (am-) or ground (g-) ACP. Glass-filled composites were used as controls. Both DC and LC ACP UPHM composites exhibited relatively high levels of water sorption accompanied by a significant hygroscopic expansion. The latter may potentially be useful to offset high polymerization stresses that develop in these materials. Ion release profiles of the experimental materials confirmed their potential for regeneration of mineral-deficient tooth structures. Their moderate to low mechanical strength after 3 months of aqueous immersion did not diminish the enthusiasm for the proposed use as endodontic sealers. For that application, DC g-ACP composites appear to be the most adequate, but micro-leakage and quantitative leachability studies are needed to fully establish their suitability.
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