摘要
目的评价葡萄籽提取物及维生素C钠2种抗氧化剂恢复漂白后,釉质粘接强度的作用。方法用离体牙制备釉质剪切粘接强度测试试件150块,根据表面处理方法的不同将试件随机分为10组(n=15):对照组(不漂白直接粘接),直接粘接组(漂白后直接粘接),2.5%、5%、10%、15%葡萄籽提取物处理组(漂白+葡萄籽提取物处理5 min后再粘接),2.5%、5%、10%、15%维生素C钠处理组(漂白+维生素C钠处理5 min后再粘接),测试其粘接后的剪切粘接强度,并用显微镜观察试件的断裂模式。另外选取20颗离体牙用前述方法制备试件并分为10组,垂直粘接界面切开试件后,用扫描电镜观察粘接界面的超微结构。结果漂白后,直接粘接组与2.5%葡萄籽提取物处理组和2.5%、5%、10%维生素C钠处理组间剪切粘接强度的差异无统计学意义(P>0.05),均低于对照组(P<0.05),其粘接界面的树脂与釉质间结合不紧密,渗入釉质的树脂突较短,形态不完整、不规则;5%、10%、15%葡萄籽提取物处理组和15%维生素C钠处理组的剪切粘接强度与对照组之间的差异无统计学意义(P>0.05),其粘接界面的树脂与釉质结合紧密,渗入釉质的树脂突较长,形态完整、规则。粘接界面断裂是全部实验组的主要断裂模式。结论漂白后,釉质粘接强度明显降低,用5%葡萄籽提取物或15%维生素C钠处理5 min即可恢复粘接强度。
Objective This work aimed to evaluate the ability of two kinds of antioxidants,namely,grape-seed extract and sodium ascorbate,in restoring bond strength at the resin-enamel interface after bleaching.Methods Ten groups of samples with 15 teeth per group were prepared for shear-bond-strength test at the resin-enamel interface after bleaching.The groups were as follows:control;no antioxidant;2.5%,5%,10%,or 15%grape-seed extract;and 2.5%,5%,10%,or 15%sodium ascorbate.The peak values of shear bond strength when resin was debonded from teeth and the failure modes under a microscope were recorded.Ten other groups of teeth with two teeth per group were prepared and treated in a similar approach before resin bonding.The samples were cut vertically to the bonding interface.The structures of the bonding interface were compared by scanning electron microscopy.Results No statistically significant difference in shear bond strength was found among the no-antioxidant,2.5%grape-seed extract,and 2.5%,5%,or 10%sodium ascorbate groups(P>0.05),which were statistically significantly lower than the control group(P<0.05).Evidence of marginal gap was observed at the resin-enamel interface,and resin tags in enamel were short,poorly defined,and fragmented.No statistically significant difference in shear bond strength was found among 5%,10%,or 15%grape-seed extract,15%sodium ascorbate,and control groups(P>0.05).No evidence of discontinuity was found at the adhesion interface,and resin tags in enamel were long,well defined,and structurally intact.Failure in the adhesive joint was the major debond mode in all experimental groups.Conclusion Immediately after bleaching,the bond strength of dental enamel significantly decreased.Bond strength can be restored by 5%grape-seed extract or 15%sodium ascorbate in 5 min.
作者
徐英新
李稳
苏敏
Xu Yingxin;Li Wen;Su Min(Center of Stomatology,Peking University Shenzhen Hospital,Guangdong Province Engineering Research Center of Oral Disease Diagnosis and Treatment,Shenzhen 518036,China)
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2021年第4期453-457,共5页
West China Journal of Stomatology
基金
广东省高水平临床重点专科(深圳市配套建设经费)(SZGSP008)
北京大学深圳医院基础研究基金(JCYJ2018018)
北京大学深圳医院教育教学研究基金(JX202004)。
作者简介
通信作者:徐英新,主任医师,博士,E-mail:doctorxuyingxin@sina.com。
