下颌关节脱位是下颌骨的关节头从关节窝内脱位,可分单侧脱位和双侧脱位;急性脱位和慢性脱位。慢性脱位又叫习惯性或复发性脱位。多因受外伤、大开口、打哈欠而发生。下颌关节脱位病人常表现为开口状态,唾液外流,言语不清,咀嚼和吞咽困难,脸形变长,颊部变平。单侧脱位时,下颌向 Mandibular dislocation of the mandible joint head from the joint socket dislocation, can be divided into unilateral and bilateral dislocation; acute dislocation and chronic dislocation. Chronic dislocation, also known as habitual or recurrent dislocation. Mostly due to trauma, opening, yawning and occurred. Patients with mandibular dislocation often show open state, salivary flow, ill-defined, chewing and swallowing difficulties, face shape longer, cheek flatten. Unilateral dislocation, the mandibular