托槽去除后不同牙面处理方法的比较

目的：观察正畸托槽去除后2种牙面处理方法对牙表面结构的影响,为正畸治疗后牙面处理提供参考依据。方法：选择因正畸治疗需要拔除的前磨牙30颗,按照牙面处理方法不同随机分为2组,每组15颗。分别用常规方法（金刚砂车针加橡皮轮）和日本产矽粒子进行牙面处理,记录所需操作时间。用粗糙度轮廓仪测量抛光后牙面粗糙度（Ra）,并作扫描电镜观察、照相。操作时间及牙面粗糙度测量值（Ra）采用SPSS13.0软件包进行配对t检验。结果：托槽去除后2种牙面处理方法的操作时间及处理后牙面粗糙度无显著差异（P〉0.05）。扫描电镜显示,矽粒子处理后牙表面划痕较常规组细而浅。结论：矽粒子对正畸托槽去除后牙表面的处理结果可以达到临床要求。

Comparison of different means for tooth surface polishing after bracket debonding

PURPOSE: To observe the tooth surface after acid etching and removing of bonding adhesive by two means for polishing. METHODS: Thirty extracted premolars for orthodontic purpose were used in this experiment. The brackets were adhered and debonded. Then the premolars were randomly divided into two groups. They were treated by traditional method and silicone particles, and observed by roughness instrument and scanning electronic microscope. The polishing-time and surface roughness value(Ra) were recorded. SPSS13.0 software package was used for paired t test. RESULTS: There was no significant difference in Ra and polishing-time between the two groups (P>0.05). Under SEM, the scratches on tooth surface polished by silicone particles were shallower and thinner. CONCLUSION: The silicone particles could provide good requirement for tooth polishing after bracket debonding clinically.