Dérand Per, Hirsch Jan-Michael
Consultant, Department of Surgical Sciences, Oral and Maxillofacial Surgery, Medical Faculty, Uppsala University, Uppsala, Sweden.
J Oral Maxillofac Surg. 2009 Aug;67(8):1640-3. doi: 10.1016/j.joms.2009.03.039.
The purpose of this study was to investigate the possibility of virtually designing and manufacturing a template for reconstruction plate bending, to be used during treatment of congenital or acquired bony entities. The outcome was compared with plates bent by the freehand approach in a stereolithographic skull model.
From a computed tomography examination, a polygon skull was created and the corresponding stereolithographic model retrieved. A polygon mesh of a Compact UniLock 2.4-mm plate was obtained from Synthes (Bettlach, Switzerland). The polygon plate was bent virtually around the mandible and rendered in all 3 dimensions, and a template was created. Five 10-hole plates were bent using this template, and five 10-hole plates were bent using a stereolithographic model as the template. The 2 groups were compared using the Wilcoxon signed rank test. P values less than .001 was considered to be statistically significant.
No statistical difference was seen between the 2 methods. The median discrepancy between the 2 groups was 0.1 mm.
Within the constraints of this investigation, by use of a virtually produced template based on a virtually planned reconstruction, it is possible to bend a reconstruction plate with the same degree of accuracy as that of the traditional freehand approach.
本研究旨在探讨虚拟设计和制造用于重建钢板弯曲的模板的可能性，该模板将用于先天性或后天性骨病变的治疗。将结果与在立体光刻颅骨模型中通过徒手方法弯曲的钢板进行比较。
通过计算机断层扫描检查创建多边形颅骨，并获取相应的立体光刻模型。从Synthes（瑞士贝特拉赫）获得2.4毫米Compact UniLock钢板的多边形网格。将多边形钢板围绕下颌骨进行虚拟弯曲，并进行三维渲染，从而创建一个模板。使用该模板弯曲五块10孔钢板，使用立体光刻模型作为模板弯曲五块10孔钢板。使用Wilcoxon符号秩检验对两组进行比较。P值小于0.001被认为具有统计学意义。
两种方法之间未观察到统计学差异。两组之间的中位数差异为0.1毫米。
在本研究的限制范围内，通过使用基于虚拟规划重建的虚拟生成模板，可以以与传统徒手方法相同的精度弯曲重建钢板。
