But the patient tried to spit the sputum and blew the nose repeatedly after the operation,this resulted in the complication of subcutaneous emphysema.But the cause of oroantral fistula was unsure.

• 该牙拔除顺利、完整,术后患者反复擤涕、咳痰,导致皮下气肿形成,但上颌窦穿孔是否与擤涕、咳痰有关,则不能确定。