水对水门汀黏结强度和稳定性的影响

Effect of water on the bond strength and durability of cements

目的采用水中浸泡的人工老化方法,比较临床常用的三种水门汀的剪切黏结强度差异,分析水的溶解和降解因素对水门汀的影响作用,为临床合理选择水门汀提供科学依据。方法制作圆盘状镍铬合金试件和离体牙牙本质试件各90个,分别用日本松风公司的玻璃离子水门汀(CX)和聚羧酸锌水门汀(CE)、上海齿科材料厂的增强型玻璃离子水门汀(RGC)进行粘结,于37℃蒸馏水中保存24 h、1个月、6个月后,进行剪切黏结强度测试,并进行ANOVA分析。结果 CE、CX在水中浸泡24 h、1个月、6个月后的剪切黏结强度无显著变化(P>0.05),RGC浸泡6个月后的剪切黏结强度显著低于在水中浸泡24 h(P<0.05)。结论 RGC在水中浸泡6个月后其剪切黏结强度显著降低,由此说明该水门汀的抗水性和长期使用稳定性弱于其它两种水门汀。

Aim To compare the shear bond strength of three common clinical cements,and to analyze the dissolution and degradation of water on the cement so as to provide clinical scientific evidence.Methods 90 disk-shaped nickel-chromium alloy specimens and 90 nature of isolated teeth specimens were produced respectively and bonoled with Japanese pines glass ionomer cement（CX）and zinc polycarboxylate cement（CE）,and enhanced glass ionomer cement（RGC）made by Shanghai Dental Material Factory,then stored in distilled water at 37 ℃ for 24 h,1M,6M before the shear bond strength test and ANOVA analysis.Results When CE,CX were soaked in water for 24 h,1 M,6 M there was no significant change in shear bond strength（P0.05）,after soaking 6 M shear bond strength of RGC was significantly lower than that in water immersion 24 h（P 0.05）.Conclusion After being soaked in water 6 M the shear bond strength of RGC was significantly reduced,thus its cement water-resistance and long-term use stability is weaker than the other two kinds of cement.