目的 确定Scotch-bondMP粘结剂对增加银汞充填后牙尖无基釉抗折力的作用。方法 取健康新鲜离体、牙体的近远中径及颊舌径一致、牙尖高度相等的双尖牙20颗。磨除近远中邻面，使之近远中径为4mm，在颊牙尖釉质层下制备4mm×4mm×3mm的洞型并随机分成两组。实验组在洞璧上涂一层粘结剂，自然固化60秒后填入调拌好的银汞合金，对照组仅填入银汞合金。37℃生理盐水中保存1周，在Instron测试机上测定使牙尖折裂的力。结果 实验组和对照组的力值分别为775.7±551.7和589.7±302.0（牛顿），但统计学检验无显著性差异。结论 Scotch-bondMP粘结剂增加余留牙体抗折的力量是有限的。%Objective Determining cusp enamel reinforcement of Scotch-bond MPto bonded amalgam teeth. Methods 20 fresh extracted,same size in mesiodistal and height of cusp,1st up-premolars were taken for this study.The tooth preparations were enamel wall of test cavities were treated with Scotch-bond,then amalgam was condensed,the others were filled with amalgam only.After one week store in 37 ℃ NaCl solution,the breaking strenth were measured with an Instron. Results Mean force for fracture of test and control groups was 775.7 N and 589.7 N separately analysis showed that deviation of means had no statistical significance(P>0.05). Conclusion Reinforcement of cusp statistical nobase enamel with amalgam by Scotch-bond was limited.
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