【摘要】 目的:采用一种新的界面处理方法,对不同类型牙本质粘接剂的粘接强度与界面形态进行研究。方法:选取人无龋磨牙,暴露咬合面牙本质,分别使用3种粘接剂(Single Bond,SB;Clearfil SE Bond,SE;ClearfilS 3Bond,S3)制备粘接样本。粘接样本切割成粘接界面约为0.9mm×0.9mm的柱形小条,用微拉伸测力仪测试粘接强度(n=15)。另外将粘接样本依次用6mol/L盐酸、5%次氯酸钠和0.08mg/ml透明质酸酶溶液处理,扫描电镜观察粘接界面形态。结果:3种粘接剂的牙本质粘接强度分别为:SB(35.50±6.40)MPa,SE(45.06±5.29)MPa,S3(30.46±3.82)MPa,三者之间差异具有统计学意义(P<0.05)。SB粘接界面的树脂突长约9～12μm,部分样本出现混合层易与粘接剂层分离。SE形成的树脂突长约9～14μm,无混合层与粘接剂层分离现象。使用S3后,树脂突稀疏,长约4～7μm,混合层与粘接剂层结合紧密。结论:牙本质粘接剂的粘接界面形态与粘接强度存在一定的相关性。更多还原

【Abstract】 Objective:To evaluate bond strength and interface of various dentin adhesives by a modified interface processing method.Methods:Nine extracted human molars were ground to expose fresh dentin surface.Three dentin adhesives(Single Bond,Clearfil SE Bond and Clearfil S3 Bond) were applied respectively and a block of composite resin was built up.The specimens were then stored in distilled water for 24 h at 37 ℃ and sectioned into beams of 0.9 mm×0.9 mm cross-sectional area.The microtensile bond strength was determined with Microtensile Tester(n=15).In addition,the bonding specimens were conditioned with 6 mol/L HCl,5% NaOCl and 0.08 mg/ml hyaluronidase to observe the adhesive interfaces by SEM.Results:Significant differences in bond strength were observed among the three adhesives(P<0.05):SE Bond(45.06±5.29) MPa> Single Bond(35.50±6.40) MPa> S3 Bond(30.46±3.82) MPa.Single Bond showed resin tags about 9-12 μm long and gaps between hybrid and adhesive layers.No obvious boundary between hybrid layer and adhesive were observed for both SE Bond and S3 Bond,while the length of resin tags were 9-14 μm and 4-7 μm for SE Bond and S3 Bond respectively.Conclusion:The morphology of the bond interface of dentin adhesive has a relationship with the bond strength.更多还原