正确的临床检查是诊治疾病的前提和基础[1]。开口度的检查是口腔颌面外科专科检查中一项判断咀嚼功能的重要检查,因为开口受限必然影响咀嚼功能。检查开口度受限是以上下中切牙的切缘之间的距离为标准,正常开口度平均为3.7cm,小于3.7cm为受限,大于5.0cm为开口过大[2]。以往本科判断患者开口度都是由医护人员指导患者自己用示、中、无名三指合 Correct clinical examination is the prerequisite and basis for diagnosis and treatment of diseases [1]. The opening degree of inspection is an important inspection of oral and maxillofacial surgery check masticatory function check, because the opening is bound to affect the chewing function. Check the opening is limited by the distance between the incisors of the upper and lower incisors as the standard, the average normal opening 3.7cm, less than 3.7cm is limited to more than 5.0cm for the opening too large [2]. In the past to determine the degree of undergraduate open patients are guided by the medical staff to use their own show, in the nameless three fingers together