Objective To explore the effect of different composite removal methods on enamel following bracket debonding by a scanning electron microscope and find an ideal method of removing residual composite.
结论:慢速碳钨车针损害最小,是理想的去粘结剂方法。
Aim: To explore the effects of five composite removal methods on enamel surface after metal bracket debonding and find an ideal method of removing residual composite.
去托槽后随机分为5组,每组10颗,分别用5种方法(A组:金刚砂车针;B组:不锈钢凸轮;C组:碳钨车针;D组:金刚砂车针+碳钨车针;E组:不锈钢凸轮+碳钨车针)去粘结,记录操作时间,用万能工具显微镜再次测量后计算釉质损失量,并在扫描电镜下观察。
Purpose In this study five composite removal methods were evaluated andcompared following metal bracket debonding, the purpose was to find anideal method of removing residual composite.
材料与方法：选择因正畸治疗需要拔除的正常上颌第一前磨牙50颗，包埋固定在测量基座中，用万能工具显微镜完成初次测量，常规粘结金属托槽于离体牙上，粘结剂充分固化后用托槽去除钳去除托槽，按去粘结剂方法不同随机分为5组，每组10颗，进行去粘结，记录所需操作时间，用万能工具显微镜再次测量，两次测量的差值即釉质损失量。
Objective: To study the de-epithelialization effect of different concentrations of AgNO3 solutions at different time points on intestines of rabbits and explore its clinical significance on enterocystoplasy.
目的：观察不同浓度的AgNO_3溶液在不同时间内对兔肠的去粘膜作用，探讨一种新的去粘膜方法。