计算托槽脱落率和粘接材料残留指数。
The bond failure rate and the adhesive remnant index were calculated.
目的：比较15秒和6 0秒酸蚀后临床托槽脱落率的差异，从而探讨正畸临床适宜的牙釉质酸处理时间。
Objective:To investigate the most appropriate etching time in orthodontic treatment, by comparing the clinical failure rates of bracket bonded at 15 seconds and 60 seconds etching.
目的：比较15秒和6 0秒酸蚀后临床托槽脱落率的差异，从而探讨正畸临床适宜的牙釉质酸处理时间。
Objective:To investigate the most appropriate etching time in orthodontic treatment, by comparing the clinical failure rates of bracket bonded at 15 seconds and 60 seconds etching.
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