Wood James S, Marlow Nicole M, Cayouette Monica J
Gen Dent. 2015 Nov-Dec;63(6):e20-2.
The aim of this in vitro study was to compare the actual torque of 2 manual wrench systems to their stated (target) torque. New spring- (Nobel Biocare USA, LLC) and friction-style (Zimmer Dental, Inc.) manual dental torque wrenches, as well as spring torque wrenches that had undergone sterilization and clinical use, were tested. A calibrated torque gauge was used to compare actual torque to target torque values of 15 and 35 N/cm. Data were statistically analyzed via mixed-effects regression model with Bonferroni correction. At a target torque of 15 N/cm, the mean torque of new spring wrenches (13.97 N/cm; SE, 0.07 N/cm) was significantly different from that of used spring wrenches (14.94 N/cm; SE, 0.06 N/cm; P < 0.0001). However, the mean torques of new spring and new friction wrenches (14.10 N/cm; SE, 0.07 N/cm; P = 0.21) were not significantly different. For torque measurements calibrated at 35 N/cm, the mean torque of new spring wrenches (35.29 N/cm; SE, 0.10 N/cm) was significantly different (P < 0.0001) from the means of new friction wrenches (36.20 N/cm; SE, 0.08 N/cm) and used spring wrenches (36.45 N/cm; SE, 0.08 N/cm). Discrepancies in torque could impact the clinical success of screw-retained dental implants. It is recommended that torque wrenches be checked regularly to ensure that they are performing to target values.
这项体外研究的目的是比较两种手动扳手系统的实际扭矩与其规定（目标）扭矩。对新型弹簧式（美国诺贝尔生物科技有限责任公司）和摩擦式（登士柏西诺德公司）手动牙科扭矩扳手，以及经过消毒和临床使用的弹簧扭矩扳手进行了测试。使用校准扭矩计将实际扭矩与15和35 N/cm的目标扭矩值进行比较。通过带有Bonferroni校正的混合效应回归模型对数据进行统计分析。在目标扭矩为15 N/cm时，新型弹簧扳手的平均扭矩（13.97 N/cm；标准误，0.07 N/cm）与使用过的弹簧扳手的平均扭矩（14.94 N/cm；标准误，0.06 N/cm；P < 0.0001）有显著差异。然而，新型弹簧扳手和新型摩擦扳手的平均扭矩（14.10 N/cm；标准误，0.07 N/cm；P = 0.21）没有显著差异。对于校准为35 N/cm的扭矩测量，新型弹簧扳手的平均扭矩（35.29 N/cm；标准误，0.10 N/cm）与新型摩擦扳手（36.20 N/cm；标准误，0.08 N/cm）和使用过的弹簧扳手（36.45 N/cm；标准误，0.08 N/cm）的平均扭矩有显著差异（P < 0.0001）。扭矩差异可能会影响螺丝固位牙科植入物的临床成功率。建议定期检查扭矩扳手，以确保其按目标值运行。
