PURPOSE: to study the effect of maxillary and mandibular lip bumper on tooth and dental arch in late mixed dentition.
目的：研究上下颌唇挡同时应用对替牙晚期儿童牙牙合的影响。
The experiment also show the removable heavy labial wire anchorage system is better than Nance palatal arch and lip bumper.
实验研究也显示在阻止磨牙近中移动方面，该系统优于腭托及唇挡。
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