A torque wrench for preventing transmission of torque in excess of a threshold level to avoid damage to replaceable scaler tips and hand pieces of ultrasonic dental instruments. The torque wrench has a housing with a core seated therein, with a cam mechanism or spring engagement between the core and...http://www.google.fr/patents/US7159494?utm_source=gb-gplus-shareBrevet US7159494 - Torque limiting wrench for ultrasonic scaler tip insertion
Torque limiting wrench for ultrasonic scaler tip insertion
