Comparison of Tightening Screw Accuracy of Electronic Torque Drivers.

PURPOSE: To compare the tightening torque accuracy of three electronic torque drivers. MATERIALS AND METHODS: Three electronic torque drivers were assessed using two measurement methods-pure output torque (POT) and clinical output torque (COT). For both methods, assessments were performed at set torques of 10, 20, 30, and 40 Ncm, 10 times for each setting, with each driver tested. Appropriate statistical analysis was performed according to data distribution (ie, normal vs non-normal) (alpha = .05). RESULTS: POT was significantly higher than COT at a set torque of 30 Ncm (P < .001). CONCLUSION: In fastening an implant screw at 30 Ncm, the operator should also consider the output torque generated in the electronic torque driver.