| 摘要 |
<p>PURPOSE:To efficiently subject a hard tissue to safe and sure scaling, route planing, etc., while vibrating the grinding chip with the extremely small power at which a soft tissue is not damaged. CONSTITUTION:The grinding chip 30 which is formed by curving front end of the chip to a required shape and has a prescribed natural vibration frequency is connected to a vibrating element 25 of a hand piece 20 and excitation signals are generated by excitation signal generating means 120, 130. These signals are outputted to the vibrating element 25. On the other hand, an operator changes the generation frequencies of the excitation signals generated by the excitation signal generating means 120, 130 by operating a frequency generating means 131 while displaying the signals on a frequency display means 135 at need. The frequencies are thus surely matched with the oscillation frequency adequate for the vibration of the grinding chip 30, more preferably the natural oscillation frequency of the grinding chip.</p> |
