本发明涉及一种牙科手持件，其包含两个通过连接装置沿轴向彼此连接，通过操作其中Triebwellen-和用于所述至少一个冷却介质冷却剂管线区段被布置在把手手柄部件彼此再次分离。 所述连接装置包括设置在一手柄部分，延伸的导向凸起，该凸起接合在那里形成针对用于轴向两个机头部件旋转的止动另一手机部件的开槽引导件。 导向突起（33），用于防止旋转，作为提供用于引导一个冷却剂管线部分（34）。 两个冷却剂管线区段（25，34）的连接被设置为插件与密封装置（40），在其间形成连接。 这里还提供了锁定装置（35，36）设置有在手持件的一部分，这是在其它机头部分布置有径向弹性的保持部件（36）（10）反部件（35），用于轴向耦合两个机头Telle公司（9,10）自动地相互混合并 按手柄脱离。 （40）此外，弹性压力装置本，这在授予两个机头部分时联接器的齿轮连接的啮合的精确定位（23，24）的接合位置（9,10）连接在一起驱动器，因为部分（5,6），手持件部件（9 ，10）轴向抵靠的止挡（63，按64）。

The invention relates to a dental handpiece, which contains two axially interconnected by means of a connecting device, separable from one another again by actuating a handle handpiece parts in which Triebwellen- and coolant line sections are arranged for at least one cooling medium. The connecting device includes a arranged on a handpiece part, extending guide projection, which engages in a slot guide on the other handpiece part and forms a stop against rotation of the two handpiece parts axially. The guide projection (33) for preventing rotation is provided as if to guide the a coolant line section (34). The connection of the two coolant line sections (25, 34) is designed as a plug-in connection with sealing means (40) therebetween. There are further provided locking means (35, 36) with radially resilient retaining members (36) provided on one handpiece part, which with the other handpiece part (10) arranged counter-members (35) for axial coupling the two handpiece parts (9, 10) automatically with each other in and at actuation of the handle to disengage. In addition, elastic pressure means (40) are present, which in the engaged position to grant an exact positioning of the tooth engagement (23, 24) of the gear connection of the coupling of the two handpiece parts (9, 10) each detachable drive shaft sections (5, 6) the handpiece parts (9 , 10) axially pressing against a stop (63,64).