The purpose of this study is to calculate the 3D position of a virtual mini screw using CBCT imaging. Patient records and DICOM images (n=92) were obtained from USC Graduate Orthodontics. With the aid of patient photographs and casts, a virtual mini screw implant was implanted between the first and second premolar on the 3D image. 3D positions from anatomical landmarks were measured using InVivo software. Results showed that the average mini screw to second bicuspid root distance is 0.83 +/- .24 mm, and the mini screw to first molar root distance is 0.85 +/- .22 mm. The average implant to the molar root apex distance is 8.6 +/- 2.1 mm. Due to the lack of resolution of the 3D images, the horizontal measurements (lingual cortical plate to mini screw tip) could not be measured. Not all 3D coordinates could be measured with the given 3D data, but useful clinical data can be derived from the results.
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