RMGIC联合自酸蚀粘接剂修复Ⅴ类洞粘接强度和边缘微渗漏的研究

Study on Shear Bond Strength and Marginal Microleakage of Class Ⅴ Cavities Restored by RMGIC Combined with Self-etching Adhesive

目的:研究树脂加强型玻璃离子联合自酸蚀粘接剂修复Ⅴ类洞时对粘接强度和边缘微渗漏的影响。方法:收集40颗新鲜拔除健康磨牙,随机等分为A1、A2和B1、B2四组。A组于离体牙颊面制备牙本质平面,A1组不做处理,A2组牙本质平面使用贺利氏ibond处理,随后利用模具及光固化灯将FujiⅡLC圆柱体粘接在牙本质平面上,万能测试机检测牙本质抗剪切粘接强度。B组于牙颈部制备Ⅴ类洞型,B1组不做处理,B2组窝洞使用贺利氏ibond处理,随后进行FujiⅡLC充填后常规修形及抛光,将标本置于37℃1g/L罗丹明B溶液中24h进行荧光染色后制作薄切片,激光共聚焦显微镜观察测量染料渗入深度。结果:A1、A2组牙本质抗剪切粘接强度分别为(5.15±0.69)、(14.91±1.33)MPa,B1、B2组的边缘微渗漏深度分别为(21.64±1.10)、(8.63±0.56)μm,A组与B组组内比较分别存在统计学差异(P<0.05)。结论:利用RMGIC充填牙颈部Ⅴ类洞时结合自酸蚀粘接剂可以明显提高牙本质粘接力强度并且可以明显减少充填体边缘微渗漏。

Objective： To evaluate shear bond strength and marginal microleakage of Class V cavities restored by resin modified glass ionomer cement combined with self--etching adhesive. Methods： Forty fresh extracted molars were collected and divided into four groups randomly： A1, A2, B1, and B2. The group A were prepared dentinal plane on buccal surface, the group A1 was not treated and the group A2 was handled with ibond. Resin modified glass ionomer cement cylinder was bonded to the dentinal plane by mold and Curing-- Lingt. The shear bond strength was detected by electronic universal force measurement machine. The group B were prepared Class V cavi- ties, the group B1 was not treated and the cavity of group B2 was handled with ibond. After FujiⅡLC filling, the routine modification and polishing were performed. The specimens were cut into thin sections after they were incu- bated at 37℃ lg/L rhodamine B solution for 24 hours and fluorescence staining. The depth of dye penetration was measured by confocal microscope. Results： The shear bond strengths of dentin in A1 and A2 were （5.15±0.69） and （14.91±1.33） MPa. The depths of marginal microleakage in group B1 and B2 were （21.64±1.10） were （8. 63±0.56） μm. Significant differences were observed in group A and group B （P〈0.05）. Conclusion： The using of self--etching adhesive could improve the bonding strength of dentin and reduce the marginal microleakage when fill- ing the Class V cavities with resin modified glass ionomer cement.