银汞合金粘结修复后微渗漏及抗力性能的研究

目的研究不同银汞合金粘结剂微渗漏及抗力性情况。方法在新鲜离体牙上制备标准的Ⅰ类洞型并随机分为三组。在洞壁分别涂上牙本质树脂粘结剂、玻璃离子并建立空白对照组，冷热交替试验（4～60℃，循环600次），观察修复体与洞壁间边缘微渗漏的差异及抗压测试银汞合金或牙齿断裂时的压力。结果玻璃离子和牙本质树脂粘结剂作为银汞合金粘结剂与对照组相比，能更好的减少微渗漏（P〈0．05），玻璃离子粘结剂能起到更好的封闭修复体边缘的作用（P〈0．01）。两者与对照组相比都可以增大牙体承载的压力（P〈0．05），但两者之间差异无统计学意义（P〉0．05）。结论玻璃离子和牙本质树脂粘结剂作为银汞粘结剂都可以起到很好的边缘封闭作用，并能增大牙体的承受能力。

Objective To study the microleakage and resistance capacity of diffrerent amalgam binder. Method Freshly extracted teeth with class Ⅰ criteria were divided into 3 groups randomly. Dentin in the wall were painted resin cement, glass ionomer and also the control group was established, alternating hot and cold test （4 - 60℃, 600 cycles） was applied to observe the difference of microleakage and tooth fracture pressure between the wall and amalgam. Results As dental amalgam binder, glass ionomer and dentin adhesive resin cement were better to reduce the microleakage compared with the control group （P 〈 0.05 ） , glass ionomer was a better restoration to play a role of the edge closure （ P 〈 0. 01 ）. Compared with the control group they both could increase the compression pressure （ P 〈 0. 05 ）, but there was no difference between them （ P 〉 0. 05 ）. Conclusion Glass ionomer and amalgam dentin adhesive resin cement can be used as avaliable material to play the role of the marginal seal and can increase the compression capacity of teeth.