
·To substitute the intermittent use by the continuous contact
With high speed rotary hand piece the intermittent use is necessary to prevent the tooth overheating. With ultrasound the heating is much less and it can be used continuously. More than this, continuous use must be made to compensate its smaller cutting speed. Or either, despite the cutting speed being smaller with ultrasound, it becomes efficient with the continuous use.
·To allow small movements
With high speed rotary hand piece it is necessary great control and firm hand. With ultrasound the cutting speed is much smaller and the risk of cutting beyond the necessary almost does not exist. Moreover, to make small movements increases the cutting efficiency.
·To reduce the pressure on the tip while it cuts
The pressure necessary to cut with ultrasound is much smaller than with high speed rotary hand piece. In average, one third of the pressure is necessary. Since the cutting speed of the ultrasound is smaller, the tendency of the professional, in the first uses, is to pressure more (as if it was using a blind drill). This worsens the situation, because pressuring more hinders the vibration movement. Only with a very small pressure the tip vibrates freely and the cutting is efficient.
·To prevent cutting with the lateral surface
The best cutting positions are the thrusting with the nib of the tip and the planning with front and back surfaces. The laterals cut less and can be used for finishing.
.To never use as handspike
The use of the CVDentus tips as handspike can cause the delamination of the diamond and the reduction of its useful life.