The Root ZX II Low Speed Handpiece with OTR technology prepares root canals while displaying precise and accurate measurements. During file rotation, the torque is automatically measured. If the torque is less than the set value, the file rotation continues, but if the torque has reached the set value, the file reverses rotation by 90° and then continues in the cutting direction once again. OTR reduces file fatigue, as well as the possibility of file breakage. 

OTR offers 3 speed settings of 100, 300, and 500 rpm and 3 programmable memory modes. The module also offers operation in Normal Mode without the Optimum Torque Reverse function. In Normal Mode, 8 speed settings from 150 rpm to 800 rpm and 11 torque settings are available. This mode is useful for opening the upper part of the canal.