Based on advices from clinic-al experts and information from market surveys. The turbine was developed in 2000 and launched to the market in early 2002.It was a real success. It features high precision, high speed, low noise, strong clamping force and large output torque. It can undergo autoclave sterilization up to 135c.Its insert joint can rotate 360c and can effectively prevent back suction .It also has the advantages of firm connection ,tidy exterior and non-leakage in operation.