下颌前突(prognathism or mandibular protrusion)，牙齿正常咬合时，上前牙总是盖住下前牙。如果出现相反的情况，即下前牙兜着了上前牙，这就是人们所说的“地包天”，医学上称为下颌前突及前牙反突畸形。
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结果：下颌前突患者的术后满意率90 . 9%。
Results: 90.9% patients with mandibular protrusion are satisfied after the operation.
目的作者对骨性下颌前突伴偏斜患者的牙弓和牙齿代偿现象进行研究。
Objective To investigate the compensation of dental arch and teeth in patients with skeletal protrusion and deviation of mandible.
结论 下颌前突组，（1） 舌骨向下移位，舌背上抬，舌根向后移动。
Conclusions Of the patients with mandibular prognathism, 1. the hyoid bone shifted downward, the dorsum lingua raised and the base of the tongue moved posteriorly;
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