医学影像技术是正畸治疗术前常用的检查手段。

Medical imaging technique is commonly used prior to operative orthodontic treatment.

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研究设计：对153名学生进行检查和斑贴试验，其中有113名学生有皮肤穿刺史，70名大约10年前有牙齿正畸治疗史。

Study design. We examined and patch tested 153 students, of whom 113 had a history of pierced skin, and 70 a history of orthodontic treatment roughly 10 years earlier. Results.

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