摘要
目的:研究不同浓度磷酸酸蚀对氟斑牙釉质微拉伸粘接强度的影响。方法:实验分为4组,对照组30颗正常牙,实验组90颗氟斑牙按照TFI评分分为3组:轻度氟斑牙组、中度氟斑牙组和重度氟斑牙组。每组牙再分为3个亚组,分别采用35%、40%和45%磷酸酸蚀。进行微拉伸粘接强度测试,扫描电镜观察牙釉质粘接界面,光学显微镜观察断裂模式。结果:氟斑牙粘接强度相比对照组降低(P<0.05),氟斑牙在不同浓度磷酸酸蚀下粘接强度有显性差异(P<0.05),40%酸浓度时粘接强度最大,对照组在45%酸浓度下粘接强度最小。结论:氟斑牙的粘接强度低于正常牙;对于氟斑牙采取不同浓度酸蚀剂会改变其全酸蚀粘接强度,但酸浓度过高反而会导致粘接强度下降。
Objective：To evaluate the effect of different concentrations of phosphoric acid etching on the microtensile bonding strength of fluorosed enamel.Methods：The specimens were divided into four groups：thirty health teeth in the control group and ninty fluorosed teeth in three experimental groups.The three experimental groups were divided mild group,moderated fluorosis group and severe fluorosis group by TFI standard.Each group was divided into three sub-groups by different concentrations of phosphoric acid treatment.The micro-tensile bonding strength（MTBS）was tested and the enamel surfaces were observed by SEM.Results：The MTBS in fluorosis group was lower than that in the control group（P〈0.05）.The bonding strength was significantly different when enamels were treated with different concentrations of phosphoric acid（P〈0.05）.For fluorosis teeth,the MTBS was the highest when treated with 40% acid.However,for the normal teeth,the MTBS was the highest when treated with45% acid.Conclusion：The MTBS in the fluorosed group was lower than that of the control group.The bonding strength of dental fluorosis can be altered by etching with different concentrations of acid,but excessively high concentration of acid can conversely lead to an apparent decline of bonding strength.
出处
《口腔医学研究》
CAS
北大核心
2017年第1期51-54,共4页
Journal of Oral Science Research
基金
四川省教育厅课题(编号:112B128)
关键词
磷酸
氟斑牙
牙釉质
粘接强度
Phosphoric acid
Dental fluorosis
Enamel
Bonding strength
