这个词是什么意思？
Devices used for influencing tooth position. Orthodontic appliances may be classified as fixed or removable, active or retaining, and intraoral or extraoral. (Boucher's Clinical Dental Terminology, 4th ed, p19)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009967 · MeSH 2026。
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