Abstract：
At present, stock linear distractors are used for internal maxillary distraction osteogenesis. However, the authors\' research group has demonstrated, through an in silico analysis, that linear distraction leads to bone deformities and malocclusion, whereas helical distraction can yield ideal outcomes. A system for designing and manufacturing custom helical distractors has recently been developed, and the feasibility of these appliances now needs to be assessed. This study was, therefore, conducted to gain an initial insight into their feasibility. The study had two goals. First, it aimed to demonstrate, in an in vitro model, that the novel system of custom helical distraction can produce appropriate clinical outcomes. The second aim was to compare the performance of custom helical distractors with that of stock devices and hybrid devices (i.e., linear appliances that feature patient-specific footplates). Interpreting the results as trends, this study showed that the system of custom helical distraction resulted in in vitro outcomes that were superior to those obtained with stock and hybrid devices.
摘要：
目前,股票线性牵张器用于上颌骨内部牵张成骨。然而,作者\'研究小组已经证明，通过计算机模拟分析，线性牵引会导致骨畸形和咬合不正,而螺旋分散可以产生理想的结果。最近开发了一种用于设计和制造定制螺旋牵引器的系统，现在需要评估这些设备的可行性。这项研究是,因此,进行初步了解他们的可行性。这项研究有两个目标。首先,它旨在证明，在体外模型中，定制螺旋牵引的新系统可以产生适当的临床结果。第二个目的是比较定制螺旋牵引器与库存设备和混合设备的性能（即，具有患者特异性脚板的线性矫治器)。将结果解释为趋势，这项研究表明，定制螺旋牵引系统导致的体外结果优于使用股票和混合设备获得的结果。
