Boyle J M, Frost D E, Foley W L, Grady J J
Department of Oral and Maxillofacial Surgery, University of North Carolina, Chapel Hill.
J Oral Maxillofac Surg. 1993 Jan;51(1):45-50. doi: 10.1016/s0278-2391(10)80389-1.
Insertional torque (IT), stripping torque (ST), and uniaxial pullout tests were performed to evaluate the effectiveness of six screw systems (Wurzburg, Techmedica, Synthes, Timesh, Steinhouser, Luhr) in thin porcine rib. The Timesh 2.2-mm self-tapping screw produced the largest insertional and stripping torque of all systems tested as well as the largest difference between the insertional and stripping torque. The Timesh emergency screw also had the largest insertional and stripping torque as well as the largest difference between the insertional and stripping torque. In pullout tests, the Timesh screw was found to be the most retentive. The overall data indicated that the ideal self-tapping screw should have the largest difference possible between drill size and external diameter, a channel, and at least three self-tapping threads for maximum retention.
进行了插入扭矩（IT）、拧出扭矩（ST）和单轴拔出试验，以评估六种螺钉系统（维尔茨堡、泰克梅迪卡、辛迪斯、时代、施泰因豪泽、卢尔）在薄猪肋骨中的有效性。在所有测试系统中，时代2.2毫米自攻螺钉产生的插入扭矩和拧出扭矩最大，且插入扭矩与拧出扭矩之间的差异最大。时代应急螺钉的插入扭矩和拧出扭矩也最大，插入扭矩与拧出扭矩之间的差异也最大。在拔出试验中，发现时代螺钉的固位力最强。总体数据表明，理想的自攻螺钉应在钻头尺寸和外径之间具有尽可能大的差异、一个通道以及至少三个自攻螺纹，以实现最大固位力。
