Dent Mater:单体类型对牙科复合树脂性能的影响

2017-04-03 MedSci MedSci原创

牙体材料的发展大大推进了牙体技术的进步,复合树脂在继金属之后成为牙科直接修复的主要材料,其性能的优化一直是近年来的热点。

牙体材料的发展大大推进了牙体技术的进步,复合树脂在继金属之后成为牙科直接修复的主要材料,其性能的优化一直是近年来的热点。

Fonseca AS等学者研究五种单体:BisGMA、BisEMA、BisEMA 30、UDMA和Fit 852,在TEGDMA 的共同作用下,对复合树脂C=C转化率、吸水性、溶解性以及色彩稳定性的影响。

实验中使用傅里叶红外光谱仪在近红外的范围内检测各组复合树脂的转化率和聚合反应动力学。在水中浸泡60天后,通过质量变化情况检测其吸水性和水溶性。在干燥储存24小时、水中浸泡60天后,使用数码分光光度计应用CIELab参数计算ΔE值。所有数据使用单因素方差分析和Tukey's检测(α=0.05)进行统计学分析。

结果发现:BisGMA为基础单体的复合树脂表现出最低的转化率(62±1%),BisEMA 30则为最高(95±2%)。并且BisEMA 30的吸水性和水溶性也最强,分别为12.2±0.8%和0.97±0.1%,BisEMA的吸水性和水溶性最低,分别为0.4±0.1%和0.03±0.01%。在色彩稳定上,BisEMA 30的7.3个色单位和Fit 852的3.8个色单位,它们色彩改变的ΔE值大于3.3,而这个ΔE值在临床上认定为不可接受。

因此,基础单体的化学成分和结构对于复合树脂的转化率、吸水性、水溶性和色彩稳定性都有一定影响作用。总体来说,BisEMA作为基础单体混合TEGDMA的复合树脂在各方面都展示出最佳性能。

树脂基质组成能够影响复合树脂的物理性质、讲解过程以及色彩稳定性。由这篇研究来看,以BisEMA为基础在材料发展中是非常有前景。

原始出处:


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    2017-04-05 xzw115
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    2017-04-05 chenshujs
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    2017-04-04 jacob9231

    谢谢分享,学习了

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