Oral and maxillofacial panoramic X-ray machine is designed and manufactured according to the principle of X-ray curved surface tomography. It uses special X-ray tube for dentistry, with small focus and clear image. Exposure is controlled by X-ray exposure hand switch. The maxillofacial panoramic photography can be taken at one time. The maxillary, sinus, nasal cavity, mandibular structure and all 32 teeth can be seen in the maxillofacial panoramic photography, and the temporal lobe, mandibular joint and occlusal relationship can also be seen. When used for oral and maxillofacial panoramic photography, rotational exposure takes 16.5 seconds at one time, and motor lifting is used. It is suitable for people of different heights and can also be used Surgery and extrafacial and facial surgery are widely used. However, X-ray radiation can not be underestimated, Therefore, the use of china push button switch to control the exposure of oral and maxillofacial panoramic X-ray machine is the best protection method for medical staff engaged in X-ray examination all the year round. Because of small oral area and low X-ray dose, a china push button switch can meet the needs.