浓硫酸酸蚀聚醚酮酮的时间对其与牙本质剪切粘接强度的影响

Effects of concentrated sulfuric acid etching durations on the shear bond strength between polyether⁃ketone⁃ketone and dentin

目的研究浓硫酸酸蚀聚醚酮酮(polyether⁃ketone⁃ketone,PEKK)不同时间对其与牙本质剪切粘接强度的影响,为临床使用PEKK修复体的粘接操作提供科学依据。方法制备PEKK试件44个,随机平均分为A、B、C、D 4组:A组为对照组,仅用水磨砂纸打磨;B组、C组、D组为实验组,分别用98%浓硫酸酸蚀经打磨试件表面5 s、30 s、60 s。另外,每组随机抽取1个试件用慢速切割机制备出剖面,在扫描电镜下观察其剖面的表面形貌。4组试件与牙本质通过树脂粘接后在37℃蒸馏水浸泡24 h,测量剪切粘接强度后统计分析,通过扫描电子显微镜与体视显微镜检查试件断裂界面,统计粘接失败类型。结果B组PEKK试件酸蚀处理后剖面呈海绵状且孔隙大小均匀,C组、D组可见试件剖面有破坏状孔蚀样结构;剪切粘接强度B组(16.84±1.84)MPa、C组(12.33±1.22)MPa和D组(6.44±1.18)MPa均大于A组(3.99±1.06)MPa(P<0.05),其中B组与牙本质的剪切粘接强度最高(16.84±1.84)MPa。结论采用98%浓硫酸酸蚀PEKK表面5 s处理方法可以使PEKK与牙本质获得较好的剪切粘接强度。

Objective To study the effects of different concentrated sulfuric acid etching durations on the shear bond strength between polyether⁃ketone⁃ketone(PEKK)and dentin,providing a scientific basis for the clinical bonding procedures of PEKK prosthesis.Methods Forty⁃four PEKK specimens were prepared and randomly divided into four groups:group A was the control group,which was only polished with abrasive papers,group B,group C and group D were experimental groups,which were etched by 98%concentrated sulfuric acid for 5 s,30 s and 60 s,respectively.In addition,one sample was randomly selected from each group,and the profile was prepared by a slow cutting machine.The surface morphology of the profile was observed under SEM.After the four groups of specimens and dentin were bonded by resin,they were soaked in distilled water at 37℃for 24 h.After the shear bonding strengths were measured,the fracture interfaces of the specimens were examined by the scanning electron microscopy and stereomicroscopy,and failure models of bonding were analyzed.Results After acid etching treatments,the cross⁃sectional images in group B presented uniform spongy shapes,while the cross⁃sectional images in group C and group D showed destructive pore structures.The shear bond strengths of group B(16.84±1.84)MPa,group C(12.33±1.22)MPa and group D(6.44±1.18)MPa were higher than that of group A(3.99±1.06)MPa(P<0.05).The highest shear bond strength was ob⁃served in group B(16.84±1.84)MPa.Conclusion The surface treatment of 98%sulfuric acid etching for 5 s mani⁃fested the best bond strength between PEKK and dentin.