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Accuracy of 3D Imaging Software in Cephalometric Analysis

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Technical Report

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Naval Postgraduate Dental School, Uniformed Services University Of The Health Sciences Bethesda United States

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Introduction The rapidly emerging availability of cone beam computed tomography CBCT equipment and technology is expanding the use of 3D imaging. However, there is a lack of data regarding the accuracy of linear measurements obtained from 3D CBCT data constructed from orthodontic software. Studies to assess accuracy and precision are mandatory to validate these software tools. Purpose The purpose of this study is to compare the accuracy of linear measurements made from 3D reconstructions generated from CBCT data using a proprietary orthodontic image and analysis program with measurements made on three ex vivo porcine skulls using a coordinate measuring machine. Methods The research design is an observational comparative laboratory study. Three ex vivo porcine skulls will be used as the standard measurement models. Seventeen craniofacial anatomic landmarks will be identified on each of the three skulls. Using a coordinate measuring machine, each anatomic landmark will be measured three times and a mean standard deviation value calculated for each of the three specimen skulls. CBCT data of the specimens will be imported into a proprietary orthodontic software program used for measurement and analysis of craniofacial dimensions. The same 17 cephalometric landmarks will be located and marked on the 3D surface of the image measurements between specific landmarks will be made using the orthodontic software. The mean values obtained via the computer software will be compared to the values obtained by the coordinate measurement machine via Paired Sample t-Tests. Results The study has been approved by the Department of Research Programs,WRNMMC. Data collection will begin as soon as the software is available. Discussion The findings have the potential to validate or cause us to question the use of orthodontic software as a tool used in establishing anatomical relationships, improving diagnosis, treatment planning, and prognosis.

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