Phillips J H, Rahn B A
Sunnybrook Medical Centre, Toronto, Ontario, Canada.
Plast Reconstr Surg. 1989 Mar;83(3):447-58. doi: 10.1097/00006534-198903000-00007.
The choice of an internal fixation system for maxillofacial surgery is made difficult because of lack of information with respect to functional load. This study attempted to clarify some of the controversy with respect to maxillofacial use of these implants. Maximal compressive force to torque values were measured in standardized bone thicknesses of 1, 2, 3, and 4 mm. The screws tested were pretapped AO 1.5-, 2.0-, 2.7-, and 3.5-mm rescue screws and self-tapping Luhr, Champy, and AO 1.5- and 2.0-mm screws. Ten measurements were made for each screw type/bone thickness combination using a piezoelectric washer and torque screwdriver. It was apparent that for 1- and 2-mm bone thicknesses the use of self-tapping screws resulted in the highest compression values. In 3- and 4-mm bone thicknesses, pretapped screws offered the highest compression values. As expected, self-tapping screws had the highest torque values on insertion owing to torque loss in cutting the screw threads. The 2.7-mm screw offered no advantage over the 2.0-mm screws in 1- and 2-mm bone thicknesses but resulted in higher compression values in 3- and 4-mm bone thicknesses.
由于缺乏关于功能负荷的信息，颌面外科内固定系统的选择变得困难。本研究试图澄清这些植入物在颌面应用方面的一些争议。在1、2、3和4毫米的标准化骨厚度中测量最大压缩力与扭矩值。测试的螺钉为预攻丝的AO 1.5、2.0、2.7和3.5毫米救援螺钉以及自攻丝的卢尔、尚皮螺钉和AO 1.5和2.0毫米螺钉。对于每种螺钉类型/骨厚度组合，使用压电垫圈和扭矩螺丝刀进行十次测量。很明显，对于1毫米和2毫米的骨厚度，使用自攻丝螺钉可获得最高的压缩值。在3毫米和4毫米的骨厚度中，预攻丝螺钉提供了最高的压缩值。正如预期的那样，由于攻丝时的扭矩损失，自攻丝螺钉在插入时具有最高的扭矩值。在1毫米和2毫米的骨厚度中，2.7毫米螺钉相对于2.0毫米螺钉没有优势，但在3毫米和4毫米的骨厚度中产生了更高的压缩值。
