Accuracy of Digital Three-Dimensional Root Position Prediction via Digitized Models

Abstract

Background: Accurate root position is integral for successful orthodontic treatment. Current methods of monitoring root position are either inaccurate, exhibit poor resolution, or use relatively large amount of radiation relative to the benefits for the patient. The purpose of this study was to present an approach that can monitor root position during orthodontic treatment with minimal radiation. Methodology: At "Timepoint 0" a Cone-Beam Computed Tomography (CBCT) was taken for the patient before the start of the treatment. At "Timepoint 1" a CBCT was taken as a Reference Standard along with a digital extra-oral scan. A Predicted Root Position (PRP) assembly was made and compared to the Reference Standard to detect discrepancies between both. Results: Mesiodistal tip analysis after indirect superimposition found displacement differences of 1.85± 1.09mm for the maxillary roots and 1.79 mm ± 1.16 mm for the mandibular roots. For buccolingual torque, displacement differences of 2.13± 1.52mm for the maxillary roots and 2.29 mm ± 1.59 mm for the mandibular roots. For root tip displacement, displacement differences of 1.57± 0.86mm for the maxillary roots and 1.44 mm ± 0.82 mm for the mandibular roots. Conclusions: This method was found to have the potential to accurately predict the root position during treatment in three dimensions.