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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