Abstract: A rotatable file dental treating device (1) driven by a motor (2) includes elements (3, 18) for determining a root-canal position instruction related to a tooth apex, elements (4) for stopping the motor according the file (1) position with respect to the position instruction and first members (5, 6) for measuring and calculating the canal length (L) remaining between the file and the position instruction. The device includes second members (7, 7a, 7b) for calculating a value (D) derived from the remaining canal length and third members (8, 8a, 8b, 8c, 8d, 8e) for combining the derived value and the remaining canal length and the combination of the derived value. The canal length produced by the calculating elements (6, 7, 8, 8a, 8b, 8c, 8d, 8e) controls the motor turn-off in such a way that the rotation of the file is stopped in anticipation of the position instruction.

Abstract: The invention concerns a system (1) for managing rotary cutting tools (2,2a,2b. . . ) mounted on a motor-driven appliance (7) receiving and driving the rotary cutting tools designed to manage dentist's files comprising mainly: first identifying means (6, 8) for identifying the cutting tools, means for recording (8) reference data of each cutting tool identified by the first identifying means (6,8), means (9a, 9b) for transmitting preprogrammed values of the cutting tool to the motor-driven appliance (7), means (9a, 9b) for transmitting measurements of the operating conditions of the cutting tools from the motor-driven appliance (7) to recording means (8), means for evaluating the fatigue of the cutting tools, a computing device (12) adapted to compute a fatigue level of the cutting tools based on the reference data recording means (8) and the evaluating means.

Abstract: A rotatable file dental treating device (1) driven by a motor (2) includes elements (3, 18) for determining a root-canal position instruction related to a tooth apex, elements (4) for stopping the motor according the file (1) position with respect to the position instruction and first members (5, 6) for measuring and calculating the canal length (L) remaining between the file and the position instruction. The device includes second members (7, 7a, 7b) for calculating a value (D) derived from the remaining canal length and third members (8, 8a, 8b, 8c, 8d, 8e) for combining the derived value and the remaining canal length and the combination of the derived value. The canal length produced by the calculating elements (6, 7, 8, 8a, 8b, 8c, 8d, 8e) controls the motor turn-off in such a way that the rotation of the file is stopped in anticipation of the position instruction.