Model HJ638 fully computerized multi-purpose dental medical machine is a kind of latest stomatological medical equipment developed by our company. This machine has a humanist design, it is equipped with full-computer intelligent control system, safe and comfortable patient chair, and specially equipped with movable magnetic child pillow, which is specially provided to small and short children. Low voltage DC motor is adopted as the driving device, assisted with gas springs to keep balance. The balance arm uses a pneumatic locking device, equipped with low voltage LED film viewing lamp. The machine is equipped with constant temperature water supply system, electric gargle water device and flush water devices. It can make automatic position restoration and preset, set spittoon position, any three other positions, and can interlock with machine chair so as to meet different kinds of clinical requirements.