Foley W L, Frost D E, Tucker M R
University of North Carolina, Chapel Hill.
J Oral Maxillofac Surg. 1990 Mar;48(3):264-7. doi: 10.1016/0278-2391(90)90391-e.
Multiple systems for internal screw fixation are presently in use in oral and maxillofacial surgery. These systems differ in screw diameter, material, and design. This study evaluated the uniaxial pullout strength of five screw systems. Two-millimeter, 2.7-mm, and 3.5-mm screws were initially evaluated for pullout strength. Pretapped and self-tapped screws were then inserted into the same hole multiple times before pullout testing. Results of pullout testing revealed no significant difference in pullout strength of pretapped and self-tapped screws of equal diameter (P greater than .05). Increased screw diameter produced increased pullout strength. No significant difference in pullout strength was noted in pretapped or self-tapped screws inserted into the same hole one, two, or three times before pullout testing (P greater than .05).
目前，口腔颌面外科中使用多种内固定螺钉系统。这些系统在螺钉直径、材料和设计上有所不同。本研究评估了五种螺钉系统的单轴拔出强度。最初对2毫米、2.7毫米和3.5毫米的螺钉进行拔出强度评估。然后在拔出测试前，将预攻丝螺钉和自攻丝螺钉多次插入同一个孔中。拔出测试结果显示，相同直径的预攻丝螺钉和自攻丝螺钉在拔出强度上没有显著差异（P大于0.05）。螺钉直径增加，拔出强度也增加。在拔出测试前，将预攻丝螺钉或自攻丝螺钉插入同一个孔中一次、两次或三次，在拔出强度上没有发现显著差异（P大于0.05）。
