预酸蚀乳牙牙本质对自酸蚀粘接系统粘接强度的影响

目的:探讨预酸蚀乳牙牙本质对自酸蚀粘接系统粘接强度的影响。方法:随机选取28颗健康乳磨牙,磨除颊舌面釉质,暴露牙本质粘接面,沿近远中向劈开形成56个样本,随机分为7组(n=8)。直接涂布组(A1组,A2组和A3组)分别涂布AdperTM Easy One(AEO),Xeno-V(XV)和OptiBond All In One(AIO)三种自酸蚀粘接剂,预酸蚀组(B1组,B2组和B3组)在涂布三种自酸蚀粘接剂前先使用35%磷酸酸蚀乳牙牙本质15 s,对照组(C组)使用Prime&Bond NTTM(NT)全酸蚀粘接剂,每个样本用Z350复合树脂堆砌成直径为3 mm的树脂小柱,通过剪切试验测试剪切粘接强度,并通过扫描电子显微镜观察断裂表面形态。结果:B1组,B2组的剪切粘接强度值明显高于A1组,A2组(P<0.001);B3组与A3组的剪切粘接强度值比较无明显差别(P=0.94)。A2组的剪切粘接强度值低于C组(P<0.05);B1组的剪切粘接强度值明显高于C组(P<0.001)。扫描电镜观察结果显示各组试件断裂面形态多为牙本质和复合树脂界面破坏。直接涂布组(A1组,A2组和A3组)断裂多发生在混合层的底部,树脂突较少且低于小管口。B1组和B2组试件断裂面可见多数牙本质小管被树脂突填满,断裂多发生在混合层的中上部。B3组试件断裂面可见牙本质小管空虚,树脂突较少。结论:预酸蚀乳牙牙本质可以提高AEO,XV两种自酸蚀粘接剂的剪切粘接强度。自酸蚀粘接剂处理乳牙牙本质可以达到全酸蚀粘接剂处理的粘接强度,但应用自酸蚀粘接剂前预酸蚀乳牙牙本质可以获得更高的粘接强度。

Effect of Additional Acid Etching on the Shear Bond Strength of Self-etching Adhesive Applied to Primary Teeth Dentin

ABSTRACT Objective: To investigate the effect of additional acid etching on the shear bond strength of Self-etching adhesive applied to primary teeth dentin. Methods: 28 healthy deciduous teeth were randomly selected, the lip and cheek enamel were removed, the dentin bonding surface was exposed, and 56 samples along the proximal and distal directions were formed. They were randomly divided into 7 groups (n=8), nonetching groups(A1,A2,A3 group)was coated with Adper ^TM Easy One (AEO), Xeno-V (XV) and OptiBond All In One (AIO) self-etching adhesive, and additional etching groups(B1, B2, B3 group)were etched with 35% phosphoric acid for 15 s before application of the Self-etching adhesive. Control group(group C)was primed with Bond & Bond NTTM (NT), and then use Z350 composite resin to build a resin column with a diameter of 3 mm. Shear test was conducted to test the shear bond strength and the morphology of the fracture surface was observed by scanning electron microscopy. Results: The shear bond strength values of group B1 and group B2 were significantly higher than those of group A1 and group A2(P<0.001). There was no significant difference in the shear bond strength between group B3 and group A3(P=0.94). The shear bond strength value of group A2 was lower than that of group C (P<0.05). The shear bond strength of group B1 was significantly higher than that of group C(P<0.001). The result of TEM observation indicates that the fracture surface morphology of each group was mostly dentin and composite resin interface damage. Nonetching groups(group A1, A2, and A3) mostly occurred at the bottom of the mixed layer, and the resin protrusions were less and lower than the small nozzles. In the fracture surface of the specimens of group B1 and group B2, most of the dentinal tubules were filled with resin protrusions, and the fracture occurred mostly in the upper middle part of the mixed layer. In the fracture surface of the B3 group, the dentinal tubules were emptied and the resin was less. Conclusion: Additional acid etching improve the shear bond strength of AEO and XV self-etching adhesives applied to primary teeth dentin.The self-etching adhesive agent of the deciduous dentin can achieve the bond strength of the total-etching adhesive agent, but the use of a one-step self-etch adhesive with prior acid etching can result in a greater bond strength in primary tooth dentin.