Objective to study the change of masticatory efficiency in 7 ~ 9 year-olds with primary molar defect after treatment.
目的研究7 ~ 9岁乳磨牙缺损患儿治疗后咀嚼效能的变化。
In this article, we describe the autotransplantation of a supplemental premolar to replace an extracted first permanent molar in a 12-year-old boy.
在本文中，我们描述了自体补充臼齿以取代提取第一恒磨牙在12岁的男孩。
Results: The more distance of maxillary molar and more obvious inhibition of maxilla bone growth forward in group of 7~8 year old children were detected than those in group of 10~11 year old children.
结果：发现7～ 8岁组患儿上磨牙远移的距离大于10～ 11岁组的患儿，7～ 8岁组患儿上颌骨向前生长所受抑制较10～ 11岁组明显，7～ 8岁组患儿替牙期选用口外弓的治疗效果较10～ 11岁组为好。
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