发明授权
US4927360A Triwing orthodontic bracket 失效
三角正畸托架

Triwing orthodontic bracket
摘要:
A triwing orthodontic bracket for mandibular teeth, and having a single wide occlusal tie wing of enhanced structural strength, and a pair of spaced-apart gingival tie wings which enable rotational tooth movement and simplified ligature installation.
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