PROBLEM TO BE SOLVED: To discharge residual water within a water circuit in a dental treatment unit in a short time.SOLUTION: In the water circuit for reducing the pressure of the pressure water supplied from a water pressure source to usual pressure suitable for dental treatment to supply the reduced pressure water to the dental treatment unit, a high-pressure circuit 11 which is formed of a pressure pump 12 for pressurizing the pressure water of the water pressure source 2 to pressure higher than the usual pressure suitable for dental treatment and a solenoid valve 13 for temporarily supplying the pressurized high-pressure water to the water circuit 1, is provided at the water circuit 1 and the high-pressure water pressurized to pressure higher than the usual pressure by the pressure pump 12 is temporarily supplied to the water circuit 1 through the solenoid valve 13 to be supplied to an air turbine handpiece 6, a micromotor handpiece 7, a syringe 8, a supply water source 9, a bowl washer 10, and the like through respective control valves 5 to simply discharge residual water from the outlets of them along with the high-pressure water in a short time.COPYRIGHT: (C)2010,JPO&INPIT【課題】歯科診療ユニットにおける水回路内の残留水を短時間に排出する。【解決手段】水圧源から供給される圧力水を歯科診療用の通常圧に減圧して歯科診療ユニットに供給する水回路において、水圧源2の圧力水を歯科診療用の通常圧より高い圧に加圧する加圧ポンプ12と、加圧された高圧水を水回路1に一時的に供給する電磁弁13とからなる高圧回路11を水回路1に設け、加圧ポンプ12にて通常圧より高い圧に加圧した高圧水を、電磁弁13を介して水回路1に一時的に供給することにより、高圧水を各制御弁5を介してエアタービンハンドピース6、マイクロモータハンドピース7、シリンジ8、給水9、鉢洗い10などに供給し、それぞれの出口から残留水を高圧水と共に簡単かつ短時間に排出する。【選択図】図1
