PROBLEM TO BE SOLVED: To provide a dental treatment device that causes low attenuation of laser light.SOLUTION: A dental treatment device for eliminating dental calculi or dental plaques and sterilizing teeth includes: a vibration part which vibrates via a vibrator that generates ultrasonic vibration, and is structured so as not to come in direct contact with a shaft a chip part which is connected to the vibration part to transmit the ultrasonic vibration and outputs hydrogen peroxide water and laser light from a tip end thereof a flow passage which is formed in a shaft and in the chip part for discharging the hydrogen peroxide water from the chip part a laser light source and a laser optical lens system which are disposed on a side farther than the vibration part seen from the chip part and which emit laser light for photodegrading the hydrogen peroxide water and a light guide which is disposed in the flow passage in the shaft and in the chip part for transmitting the laser light from the laser light source and the laser optical lens system, is separated from the flow passage, and is made of material having a refraction index higher than that of the hydrogen peroxide water.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】レーザー光の減衰が生じにくい歯科治療装置を提供する。【解決手段】歯石又は歯垢の除去と歯の消毒とをする歯科治療装置であって、超音波振動を発生する振動子によって振動するとともに後記シャフトに直接に接触しないように構成される振動部と、前記振動部に接続されて前記超音波振動を伝達するとともに過酸化水素水と後記レーザ光を先端から出すためのチップ部と、前記チップ部から過酸化水素水を放出するためシャフト内及びチップ部に設けられた流路と、チップ部から見て振動部よりも遠い側に配置される過酸化水素水を光分解するレーザ光を照射するためのレーザ光源並びにレーザ光学レンズ系と、レーザ光源並びにレーザ光学レンズ系からのレーザ光を伝達するための前記シャフト内及びチップ部で前記流路中に配置され流路と分離され過酸化水素水よりも屈折率の高い材料からなるライトガイドと、を備える。【選択図】図1
