adj. premaxillary
他偶然发现了一个450万年前的有袋动物的颌骨。
He came across the jawbone of a 4.5 million-year-old marsupial.
用主动矫治器行双侧唇腭裂术前矫治前突的前颌骨是合理和有效的手段。
Using active preoperative orthopedics to reposit the protruding premaxilla of bilateral cleft palate is a reasonable and effective approach.
目的：探讨下颌升支矢状骨劈开术（SSRO）前徙下颌后，在不同颌周肌肉作用下，下颌升支手术区内的应力分布情况，从理论力学的角度为临床治疗提供依据。
Objective: To study the distribution of stress caused by different mastication muscles in mandibular ramus operative area after sagittal split ramus osteotomy (SSRO), so as to guide the clinical work.
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