Luebke N H, Brantley W A
Department of Restorative Sciences, Marquette University School of Dentistry, Milwaukee, WI.
J Endod. 1991 Jul;17(7):319-23. doi: 10.1016/s0099-2399(06)81699-7.
A laboratory study was performed on stainless steel Gates Glidden drills to determine their torsional and metallurgical properties. Samples of #1 to #6 drills from the two manufacturers that distribute these instruments in the United States were tested in incremental and continuous clockwise torsional loading by using a digital torque meter. The values of mean torque at fracture obtained with these tests generally showed no statistically significant differences for the same drill size and a given manufacturer. However, it was not possible to completely evaluate drill sizes #5 and #6 because the torsional moments developed during testing exceeded the capacity of the test instrument. Scanning electron microscope examination confirmed the occurrence of ductile torsional fracture processes, which were evident from visual observation of the instruments after fracture. This study is part of a continuing investigation to establish standards for all rotary endodontic instruments.
对不锈钢盖茨-格利登钻进行了一项实验室研究，以确定其扭转性能和冶金性能。从在美国经销这些器械的两家制造商处获取的1号至6号钻的样本，使用数字扭矩计进行了递增和连续顺时针扭转加载测试。对于相同的钻头尺寸和给定的制造商，这些测试获得的断裂时平均扭矩值通常没有统计学上的显著差异。然而，由于测试过程中产生的扭矩超过了测试仪器的容量，无法对5号和6号钻头尺寸进行全面评估。扫描电子显微镜检查证实了韧性扭转断裂过程的发生，这从断裂后器械的目视观察中很明显。这项研究是建立所有旋转牙髓器械标准的持续调查的一部分。
