上颌的一个表皮硬骨，在前颌骨的后面。
A dermal bone of the upper jaw which lies posterior to the premaxillary.
咬合必须是下颌突出式咬合，就是说，下颌的门牙必须比上颌的门牙向前突出一些。
Jaws must be undershot. The incisors of the lower jaw should protrude over the upper incisors.
赛米奥奴是医院整形外科研室的主任，她与12个专家组成医疗小组，一起重建了一个失去右眼，鼻，上颌的女病人的面部。
Siemionow, director of plastic surgery research at the hospital, worked with a dozen specialists to rebuild the face of a woman who was missing her right eye, nose and upper jaw.
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