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目的:用螺环原酸酯膨胀单体对牙科BisS-GMA基体树脂进行改性的研究。方法:分别以BisS-GMA和Bis-GMA作树脂基质,TEGDMA为稀释单体,加入和不加入螺环原酸酯膨胀单体,配制四种基体树脂。以CQ/DMAEMA为光引发体系,光固化后测定并比较其体积收缩率、聚合转化率、粘接拉伸强度和固化时间。结果:含膨胀单体的BisS-GMA基体树脂的体积收缩率较低,聚合转化率和粘接拉伸强度较高,且固化时间合适。结论:螺环原酸酯膨胀单体的开环聚合反应能使BisS-GMA基体树脂的体积收缩率显著降低,并能提高其聚合转化率和粘接拉伸强度。
OBJECTIVE: To study the modification of Dental BisS-GMA matrix resin with spiro orthoester swelling monomer. Methods: Bis-GMA and Bis-GMA as matrix resin, TEGDMA as dilution monomer, with or without spiro cyclic ester extender, four kinds of matrix resin were prepared. Using CQ / DMAEMA as photoinitiator system, the volume shrinkage, polymerization conversion, adhesive tensile strength and curing time were measured and compared after light curing. Results: The BisS-GMA matrix resin containing intumescent monomer had lower volumetric shrinkage, higher polymerization conversion and higher tensile bond strength, and suitable curing time. CONCLUSION: The ring-opening polymerization of spiroorthoester expandable monomer can significantly reduce the volumetric shrinkage of BisS-GMA matrix resin and increase the polymerization conversion and adhesive tensile strength.