Torque Wrench Recalibration

Dellinges and Curtis, 1 subjected torque wrenches to 100 autoclave sterilization cycles. Their study showed that steam sterilization increased the preload 17% above the control value. Chemiclave cycles had increases as high as 71%. The study concluded that the sterilization cycle was a more significant factor in the altering of the control value than part wear. Prior to 100 cycles, the torque wrenches did not demonstrate significant increases as a result of autoclaving. From this study, one can see that a torque wrench is altered around 100 sterilization cycles. The wrench should be recalibrated after this approximate period of use. Additionally, the wrench, if 100 cycles has not been reached, should be reviewed for part wear and corrosion within 2 years of purchase or recalibration. 1 Dellinges and Curtis. Effects of infection control procedures on the accuracy of a new mechanical torque wrench system for implant restorations. J Prosthet Dent 1996;75:93-98