气体加压技术对两步法自酸蚀粘接系统树脂牙本质粘接效果的影响

Effect of gas pressure technology on bonding performance of resin/dentine in two-step self-etch bond system

探讨使用不同压力气体吹拂两步法自酸蚀粘接剂对树脂牙本质粘接界面微观形貌及微拉伸粘接强度的影响。20颗离体的完整无龋第3磨牙去除冠釉,按粘接过程中气体吹拂处理方法不同随机分为4组(处理剂和粘合剂均轻吹;处理剂强吹,粘合剂轻吹;处理剂轻吹,粘合剂强吹;处理剂和粘合剂均强吹。轻吹气压为0.1MPa,强吹气压为0.3 MPa),每组5颗牙。各组粘接完成后,37℃水浴24 h,每颗牙切出1片薄片状试件利用场扫描电子显微镜(SEM)观察4组粘接界面微观形貌(n=5),另外每颗牙制成8根长方体形试件测试微拉伸强度(μTBS)(n=40)。SEM观察显示,第1组的粘接剂层最厚,树脂突最短小稀疏;第2组和第3组的粘接剂层较薄,树脂突更长更致密更均匀;第4组的粘接剂层最薄,但是树脂突更长更致密更均匀。第2组的μTBS最高(41.32±3.76)MPa,其次为第3组(31.17±4.80)MPa、第1组(26.24±5.21)MPa,第4组最低(14.89±2.31)MPa。在两步法自酸蚀粘接中,采用气体加压技术吹拂处理剂可显著提高树脂牙本质粘接强度。

The effect of air blowing pressure on the bonding interfacial micro morphology and micro-tensile bonding strength of resin/dentine in the two-step self-etch bond system was investigated.The occlusal enamel of 20 teeth was removed, then the teeth were randomly divided into 4 groups based on the different bonding procedures. After 24 hours in water bath at 37℃, one slab from each tooth was collected and then examined with scanning electron microscope （SEM） results （n=5）. 8 sticks from each tooth were collected, then tested the micro-tensile bond strengths （μTBS） （n=40）.SEM results shows that the first group’s adhesive layer is the thickest, while resin tags are the shortest and sparsest; the fourth group’s adhesive layer is the thinnest, while resin tags are the longest and densest; the second group and third group fall in between. The order of μTBS is： the second group〉the third group〉the first group〉the fourth group.The air blowing pressure influences resin/dentine bond strength significantly in the two-step self-etch bond system.