【摘要】 目的:通过体外pH循环实验,研究不同方法邻面去釉后釉质表面的粗糙度。方法:选择因正畸治疗需要拔除的健康前磨牙30颗,分为3组,每颗牙随机选择1个邻面为实验面,另1个邻面为对照面。3组实验面的邻面去釉方法依次为碳化钨钢车针去釉后Sof-Lex系统抛光、碳化钨钢车针去釉后用10%马来酸配合Sof-Lex系统抛光、碳化钨钢车针去釉后Sof-Lex系统抛光并应用氟保护剂。全部样本进行体外pH循环60d。用粗糙度轮廓仪测量邻面釉质的表面粗糙度,并在扫描电镜下观察。应用SPSS 13.0软件包进行配对t检验和单因素方差分析。结果:3组实验面的表面粗糙度均大于对照面,差异显著(P<0.01);3组实验面之间表面粗糙度的差异无统计学意义(P>0.05)。扫描电镜下,第2、3组实验面的釉质表面较第1组平滑。结论:邻面去釉后,釉质表面粗糙度增加,建议临床操作时局部应用氟化物。更多还原

【Abstract】 PURPOSE: To assess the surface roughness after application of interproximal enamel reduction(IER) with different methods under a pH cycling experiment in vitro.METHODS: Thirty healthy premolars were used after removal for orthodontic reasons and divided into three groups.One proximal surface underwent IER as the experimental surface while the other was untreated as control.Each group underwent IER according to one of the following techniques: tungsten carbide bur and Sof-Lex disks(group 1);tungsten carbide bur and 10% maleic acid on Sof-Lex disks(group 2);tungsten carbide bur,Sof-Lex disks and fluor protector(group 3).All samples were treated using the pH cycling experiment everyday for 60 days.Enamel surface roughness value(Ra) was measured with profilemetry and morphology was observed under scanning electron microscopy(SEM).Statistical analysis was performed using SPSS 13.0 software package by means of paired t test or one way ANOVA.RESULTS: Ra of the experimental surface increased significantly than that of control in each group(P<0.01).There was no significant difference among the experimental surfaces among the three groups(P>0.05).SEM images demonstrated that enamel surfaces were smoother in the group 2 and group 3 compared with the experimental surfaces in group 1.CONCLUSIONS: IER significantly increases surface roughness of the proximal enamel.The application of topical fluride on the enamel surface seems to be advantageous.更多还原