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目的研制一种基于口内入路的抓钩式内支撑颧弓骨折固定器并比较此固定器与其它固定的力学稳定性。方法将20侧颧弓制备成二线型骨折,按实验的先后顺序分成4组:只复位而不予固定(对照组);微钛板微钛钉固定(微钛板组);抓钩式内支撑颧弓骨折固定器固定,抓钩末端达颧弓中轴线(抓钩1组),抓钩末端未达颧弓中轴线(抓钩2组)。对4组颧弓进行垂直加载试验,记录各组的最大载荷和抓钩1组、抓钩2组和微钛板组载荷-位移曲线中0.5 mm、1.0 mm、1.5 mm和2.0mm位移所对应的载荷。结果对照组的最大载荷小于抓钩1组和抓钩2组;微钛板组的最大载荷大于抓钩1组和抓钩2组;抓钩1组和抓钩2组的最大载荷差异无显著性。0.5 mm、1.0 mm、1.5 mm和2.0 mm位移所对应的载荷,微钛板组大于抓钩1组、抓钩2组;抓钩1组和抓钩2组差异无显著性。结论抓钩式内支撑颧弓骨折固定器使用方便、固定牢靠,能有效防止外在压力对已复位骨折造成再移位。
Objective To develop a grasping hook-shaped internal support zygomatic arch fracture fixation device based on intraoral approach and compare the mechanical stability of this fixation device with other fixation. Methods 20 sides of the zygomatic arch were made into 2-line fractures, which were divided into 4 groups according to the experimental order: only resetting and not fixing (control group); micro-titanium plate micro-titanium nail fixation Support the zygomatic arch fracture fixation device, grasping the end of the hook up zygomatic arch axis (grapple 1 group), grasping hook end of the zygomatic arch axis (Grasp group 2). Vertical loading test was conducted on the four zygomatic bows. The maximum load of each group and the displacement of 0.5 mm, 1.0 mm, 1.5 mm and 2.0 mm in the load-displacement curves of the grasping hooks 1, grasping hooks 2 and the micro-titanium plate group were recorded The load. Results The maximum load of the control group was less than that of the first group and the second group of grasping hooks. The maximum load of the micro-plate group was greater than that of the first group and the second group of grasping hooks. Sex. 0.5mm, 1.0mm, 1.5mm and 2.0mm displacement corresponding to the load, micro-titanium plate group than the grasping group 1, grasping the two groups; grasping a group and grasping hook group 2 no significant difference. Conclusion Grasping hook-type internal support zygomatic arch fracture fixation device easy to use, fixed firmly, can effectively prevent the external pressure on the reset fracture caused by re-displacement.