不同涂布方式对牙本质粘结微拉伸强度的影响

摘要

AIM: To evaluate the effects of different painting ways of four dental adhesives on the bond strength to dentin. METHODS: A total of 80 intact human premolars extracted for orthodontic reansons were used. The teeth were randomly divided into 16 groups. The enamel of occlusal surfaces of these teeth was removed and surperficial dentin was exposed. Different paining methods, namely gentle painting (G) , vigorous painting (V) , 1 layer painting (1) and 2 layers painting (2) were used to apply the bonding adhesive and resin crowns were bonded. The microtensile bond strength of all specimens was tested by CMT7104 universal testing machine. RESULTS:The bond strength was as follows; G2 > V2 > V1 > G1. G2 group showed significantly higher bonding strength than the other three groups (P<0.05). There was no significant differences between V1 group and Gl group ( P > 0. 05 ). CONCLUSION: Painting methods of adhesive showed effect on microtensile dentin bond strength. Two layers gentle painting in the same direction showed higher bonding strength.%目的:观察不同涂布方式对4种牙本质粘结剂牙本质微拉伸粘结强度的影响.方法:选择80个离体前磨牙制备牙本质粘结面后,随机分为16组,每组5个,分别以轻涂(G)、重涂(V)、涂1层(1)、涂2层(2)等不同方式涂布牙本质粘结剂,并修复树脂“冠”.CMT7104型万能材料测试机测试各组试件的微拉伸强度.结果:不同涂布方式下4种牙本质粘结剂的微拉伸粘结强度依次是G2组＞V2组＞V1组＞G1组；G2组明显高于其他3组(P ＜0.05)；V1组和G1组间、V1和V2无明显统计学差异(P＞0.05).结论:不同涂布方式对牙本质粘结剂微拉伸强度具有一定的影响,轻涂2遍(G2)获得的微拉伸强度最高.