【作者】 王萍萍；

【导师】 朱松；

【作者基本信息】 吉林大学 ， 口腔临床医学， 2008， 硕士

【摘要】 目的:研究四种充填用复合树脂材料SHOFU产BEAUTIFIL(B),DENTSPLY产SureFilTM(S),瑞士产TE-Econom(T),贺利氏产卡瑞斯玛(K)与牙釉质对磨时的磨损特点,利用扫描电镜观察复合树脂的磨损状态,以及总结出磨损量与复合树脂硬度,人工唾液pH值改变后的关系。方法:利用UMT-2微摩擦磨损实验机模拟口腔咀嚼状态,应用称重法计算磨损量,测试树脂硬度值,扫描电镜观察磨损表面形貌。结果:SEM显示,BEAUTIFIL, SureFilTM树脂中无机填料颗粒体积较大,TE-Econom树脂次之,卡瑞斯玛树脂相对较小且均匀。四种树脂无机填料颗粒周围均出现裂纹和脱落迹象,卡瑞斯玛树脂磨损面可见清晰的划痕走向; TE-Econom, BEAUTIFIL,SureFilTM树脂磨损为不等量磨损,卡瑞斯玛为等量均匀磨损;四种树脂的耐磨性与硬度关系,p>0.05。牙釉质在酸性环境浸泡时磨损表面出现特征性变化。人工唾液pH值降为4.0,BEAUTIFIL、SureFilTM、TE-Econom三种树脂磨损量显著增加,卡瑞斯玛磨损量变化不显著。结论:无机填料细小而且混合较均匀的复合树脂,磨损状态趋于等量磨损,无机填料颗粒大小不均匀的复合树脂磨损状态为不等量磨损;复合树脂耐磨性与树脂硬度间没有直接关系;降低pH值可以加速某些复合树脂的磨损。更多还原

【Abstract】 Objective To evaluate the wear resistance of four types of composite resin BEAUTIFIL, SureFilTM, TE-Econom and Charisma when they were opposed by human enamel antagonist.To study the relationship about the wear resistance between hardness and the pH value.Methods Mutual wear between four types of composite resins(3×20×1mm thick)with same rough surface and opposing enamel was evaluated in a wear simulator of UMT-2.Wear resistance was assessed as weight loss(g) and the hardness of composite resin was tested by digital micro-hardness meter.The worn surfaces were observed by scanning electron microscope(SEM).All data were statistically analyzed by one-sample T Test and one-way ANOVA and spearman rank correlation.(α=0.05)Results The weight loss of the BEAUTIFIL, SureFilTM, TE-Econom composite resin by every 6000 strokes was not equal,except Charisma composite resin.The wear resistance of the materials tested was not related to their hardness(p>0.05).SEM observation showed that the fillers particles of BEAUTIFIL, SureFilTM were bigger than the other, Charisma was the smallest and well-distributed.Many filler particles were loose or missing.There were many scratch on Charisma composite clearly. In the acid environment ,the enamel surface had the special appearance. The weight loss of the BEAUTIFIL, SureFilTM ,TE-Econom composite resins increased when pH value fell down to 4.0 (p<0.05),Resin Charisma did not changed remarkably (p>0.05).Conclusion If the filler particles of the composite resin was tiny and uniformed,the weight loss of the wear were consistent and less.The hardness of the composite resin can not reflect the wear resistance. The weight loss was accelerated while the pH value decreased.更多还原