上颌窦穿孔1. Oroantral fistula and subcutaneous emphysema after upper third molar extraction:Report of one case; 上颌第三磨牙拔除术后上颌窦穿孔与皮下气肿1例报告2. Clinical cause analysis of oroantral fistula after the upper third molar extraction report of one ease 上颌第三磨牙拔除致上颌窦...