基于计算机辅助设计和制造模板的口腔正畸微螺钉手术定位准确性研究。
Accuracy of surgical positioning of orthodontic miniscrews with a computer-aided design and manufacturing template.
机构信息
Department of Orthodontics, Shandong University, Jinan, China.
出版信息
Am J Orthod Dentofacial Orthop. 2010 Jun;137(6):728.e1-728.e10; discussion 728-9. doi: 10.1016/j.ajodo.2009.12.025.
INTRODUCTION
Our objective was to enable accurate miniscrew placement after preoperative simulation. We developed a new template for miniscrew placement and evaluated its accuracy.
METHODS
Eleven patients who had bimaxillary protrusion were scanned with computed tomography. The 3-dimensional computed tomography data were used to produce, with stereolithography apparatus, a template for accurate miniscrew placement. The interradicular space available for miniscrew placement was calculated in the 3-dimensional images. Postoperative computed tomography images were matched with preoperative images to calculate the deviations between the planned and actual placements.
RESULTS
The distance for placement of a miniscrew between 2 roots was 4.12 mm (SD, 0.25 mm; range, 3.7-4.5 mm). The placed miniscrews showed an average angular deviation of 1.2 degrees (SD, 0.43 degrees ; range, 0.6 degrees -2.41 degrees ) compared with the plan, whereas the mean linear distomesial deviation was 0.42 mm (SD, 0.13 mm; range, 0.15-0.6 mm) at the tip.
CONCLUSIONS
The proposed template has high accuracy and will be especially useful for patients who require precise miniscrew placement.
简介
我们的目标是实现术前模拟指导下的精准微螺钉植入。为此，我们开发了一种新的微螺钉植入模板，并评估了其准确性。
方法
对 11 例双颌前突患者进行锥形束 CT 扫描。利用三维 CT 数据，通过立体光刻技术制作用于精准微螺钉植入的模板。在三维图像上计算用于微螺钉植入的根间可用空间。将术后 CT 图像与术前图像进行匹配，以计算计划与实际植入位置之间的偏差。
结果
两颗相邻牙根间植入微螺钉的距离为 4.12mm（标准差为 0.25mm；范围为 3.7-4.5mm）。与计划相比，植入的微螺钉平均角度偏差为 1.2 度（标准差为 0.43 度；范围为 0.6 度-2.41 度），尖端的平均线性近中偏差为 0.42mm（标准差为 0.13mm；范围为 0.15-0.6mm）。
结论
所提出的模板具有较高的准确性，对于需要精确微螺钉植入的患者尤其有用。
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