Abstract: A dental therapeutical apparatus comprising a plurality of utility units selectively connectable to a common energy supply unit, each of the utility units having different uses and being furnished with a form of energy suited for the therapeutical units.

Abstract: In dental instruments such as a dental handpiece and a syringe, a coupling device for detachably connecting a hose portion, which supplies air or liquid to these instruments, to an instrument body. The coupling device comprises a sleeve fitted over the hose portion with a clearance formed therebetween, a ball-like stop member inserted into at least one opening formed in a peripheral surface at the front end of the sleeve and movable in a diametral direction of the sleeve, a connection cylinder having one end coaxially mounted on the rear end of the instrument body and inserted into the sleeve, and an operating ring fitted over the sleeve and movable in an axial direction of the sleeve.