Accuracy of surgical positioning of orthodontic miniscrews with a computer-aided design and manufacturing template.
BACKGROUND
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.
Liu
Hong
H
Department of Orthodontics, Shandong University, Jinan, China.
Liu
Dong-xu
DX
Wang
Guangchun
G
Wang
Chun-ling
CL
Zhao
Zhen
Z
D001863:Bone Screws; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D006801:Humans; D007180:Incisor / Q000473:pathology; D007568:Jaw / Q000000981:diagnostic imaging; D008953:Models, Anatomic; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation* / Q000379:methods*; D012986:Software Validation; D025321:Surgery, Computer-Assisted; D014057:Tomography, X-Ray Computed; D014584:User-Computer Interface