邻面去釉后牙釉质再矿化的体外研究

目的 探讨邻面去釉后牙釉质再矿化的方法.方法 以正畸减数的双尖牙为实验样本,共60个,随机平分为A,B组.A组采用去釉砂条去釉＋35％磷酸抛光；B组采用片切盘去釉＋35％磷酸抛光.每组再根据不同的氟保护剂随机平分为三个亚组.Ⅰ组去釉后应用氟保护漆,Ⅱ组应用氟化泡沫,Ⅲ组未处理,为对照组.经体外PH循环15 d后采用定量的显微硬度检测,进行统计学处理.结果 每组内的三个亚组间的显微硬度值差异均有统计学意义（P值分别为0.0015和0.0016）,其中,Ⅰ组最高,ⅠA为（282.64±25.20） kg/mm2,ⅠB为（264.90±24.32）kg/mm2；Ⅲ组最低,ⅢA为（187.92±45.53） kg/mm2,ⅢB为（170.90±30.73）kg/mm2.每组内,Ⅰ、Ⅱ组间均无统计学差别,而Ⅰ组比Ⅲ组均高,差异有统计学意义；Ⅱ组比Ⅲ组均高,差异有统计学意义.结论 体外实验提示,经去釉砂条或片切盘去釉＋35％磷酸抛光后,氟保护漆和氟化泡沫对去釉后的牙釉质均有良好的再矿化作用.

In vitro study of enaml remineralization after interproximal enamel reduction

Objective To compare the methods of enaml remineralization after interproximal enamel reduction.Methods Sixty premolars from orthodontic extraction were included.The teeth were divided evenly into group A and B randomly.In group A,the interproximal enamel reduction (IER) was done with stripping strip and polished with 35％ orthophosphoric acid.In group B,IER was done with stripping disk and polished with 35％ orthophosphoric acid.Each group was divided into 3 subgroups evenly and randomly.Subgroup Ⅰ was treated with fluor protector.Subgroup Ⅲ was treated with fluoride foam.Subgroup Ⅲ was served as control group.All the samples were treated with PH cycle in vitro for 15 days.The IER surface was detected by microhardness testing machine The data were statistically analyzed using SPSS13.0.Results Both in group A and B,subgroup Ⅰ was the highest in mean microhardness,ⅠA was (282.64±25.20)kg/mm2,ⅠB was (264.90±24.32)kg/mm2,subgruop Ⅲ the lowest,ⅢA was (187.92±45.53)kg/mm2,ⅢB was (170.90±30.73)kg/rnm2.There were highly significant differences between subgroups Ⅰ and Ⅲ.The mean microhardness in subgroup Ⅱ was significantly greater than that in subgroup Ⅲ.There were no statistically significant differences between subgroups Ⅰ and Ⅱ.Conclusions Both fluor protector and fluoride foam had good remineralization effect after.interproximal enamel reduction.