1. Modern dental chair The traditional sense of the dental chair generally refers to the sale price of less than 10,000 yuan of simple dental treatment machine. It is more common in townships and individual clinics where conditions are limited. Older chairs generally do not have a doctor and assistant chair, some even do not have a spittoon, saliva inhaler, a veritable "dental chair". Despite their simplicity, these chairs can meet the needs of general dental treatment. In our country's vast rural and urban communities, individual dental clinics still have a considerable market for such dental chairs. According to the survey showed that in 1999 accounted for 80% of total sales, this survey, although there is a decline still accounted for 72% of the total demand around. "People-oriented" dental chair design is the emergence of the design concept in recent years, mainly to facilitate, comfortable, safe and hygienic several aspects of the design for the purpose. In the convenience, comfort, safety: high-grade chairs generally have a variety of personalized operating procedures, can rely on the personality of the physician's habits, set up different treatment positions (upper and lower palate teeth and rescue position), and can be programmed to do storage. Chair control part, has risen from the initial mechanical, electric control to valve control, solenoid valve control and other advanced control stage; priced at more than 70,000 yuan of mid-range and high-end chairs are usually also equipped with fully automated console, chair position adjustment can be adjusted through the backrest and knee joints of the integrated movement, rising, falling, tilting adjustment. Make the patient position more suitable for treatment; and equipped with non-slip doctor's chair and multi-function foot control device, the doctor can be in the treatment process according to the need for foot control, in the case of no need to stop the operation of the instrument to achieve the water, gas gun switch action. The middle and high grade treatment table is also equipped with a variety of steering cold light, strong bass vacuum negative pressure pump, which can make gas-liquid separation, suction and low noise. Shanghai Victory Dental Medical Instrument Factory in the country's original AM6010 model designed for children, the lowest height of the fully computerized electric chair is only 43cm, which provides convenience for the treatment of small patients. In terms of hygiene and environmental protection: According to the data of epidemiology, there is a serious problem of cross-infection in oral diagnosis and treatment in China. Hepatitis B infection rate of dentists is 3-6 times higher than that of the general population, the HBV positive rate of dentists is 25.8%, and the total positive rate of HBV contamination of dental handpieces is 62%. Therefore, preventing cross-infection of dental equipment is an important factor to be considered in the design of dental chairs. Handpiece is the most basic and important configuration of dental chair equipment. At present, the domestic use of high-speed imported turbine handpiece brand NSK, DN, Bien Air and W&H, etc., the speed up to 350,000r/min (0.25Mpa when), generally can withstand conventional 120 ℃ and rapid 135 ℃ high temperature, high pressure sterilization. Needle loading and unloading methods are divided into wrenches to change the needle and press the button to change the needle of two kinds; the interface is divided into international standard two-hole, four-hole type. The low-speed handpiece is generally divided into two kinds of straight and elbow, and the pneumatic motor for 1:1 equal speed rotation. When the handpiece stops rotating, due to inertia, it will produce a suction back airflow, resulting in broken chippings and pollutants inhaled into the handpiece, which is an important way of cross-infection in oral health care. Therefore, the anti-suckback handpiece device has become an important configuration of high-grade products. At present, the anti-suckback handpiece in high-grade chairs mainly adopts the patented technology of Japan and Germany. In the middle and high-grade products are equipped with replaceable discrete water supply, disinfection and timed rinsing of the automatic sanitation system; Shanghai Dental Instrumentation Factory's latest CS1000A comprehensive dental treatment machine, in the PU elastomer frame, paint using nano-antibacterial technology, mouthwash pellet, oral lamp and lamp shade also has antibacterial health care functions.