Motor: pneumatic systems and electric systems

There are two systems for driving burs: pneumatic systems and electric systems.

In pneumatic systems, turbines and air motors are designed differently. For turbines, the rotor directly drives the bur. The impellers of the rotor are driven by compressed gas. The turbo can idle at speeds up to 400,000 rpm. The actual working speed depends on the applied force, which is about half of the idling speed, that is, about 150,000 to 250,000 rpm. The maximum power achievable in its speed range is 10-26 watts.

The air motor indirectly drives the bur through a contra-angle handpiece or a straight handpiece. The air motor can reach a maximum speed of 25,000 rpm. Contra-angle handpieces with different speed-up and speed-down ratios. Therefore, a contra-angle handpiece with an air motor equipped with a 2:1 reduction ratio can reach a speed of approximately 12,500 rpm. the

The electric motor can idle at speeds up to 40,000 rpm. For a 1:5 speed-up contra-angle handpiece, the speed of the corresponding bur is 200,000 rpm. The maximum power exceeds 60 watts, and the torque is about 3Ncm. This means that the electric contra-angle handpiece will not slow down or stop while the bur is cutting different dental tissues or orthopedic materials. The handpiece maintains an almost constant RPM, with or without load. Contra-angle handpieces have more stable burs than turbine handpieces. Contra-angle burs vibrate less than turbo burs. Increased stability means more precise work during preparation, faster speed and less heat generation on the tooth tissue.

The electric motor trend started in Europe. An important reason is the cost of installing new pneumatic lines in existing buildings. There is also an obvious reason why electric drives are not only simpler to install, but also more efficient to use. the

Electric motors have become very popular in both Europe and Asia. Technological innovations in design, materials, torque and lighting are also making electric motors popular in North America today. Electric motors make work in the dental office easier and faster.

The current range of straight and contra-angle handpieces includes the right instrument for every need. Most manufacturers offer products for a wide range of applications, as well as products for highly specialized clinical applications.