Serial Evaluation of Orthodontic Intrusion using Intraoral Scans : A Preliminary Study

Abstract

Introduction : Study models are an essential component of diagnosis and treatment planning in orthodontics. In dentistry, a number of digital intraoral scanning systems, scanners, and configurations have been introduced and put into use. Among these, regular assessment of tooth movement is essential to achieve both functional and aesthetic outcomes and prevent unwarranted tooth movements. Hence this study was conducted to evaluate orthodontic intrusion using 3D intraoral scans at sequential intervals of time. Materials and Methods : The subjects consisted of 10 patients who were about to start their orthodontic treatment using fixed orthodontic appliances. A TMA intrusion spring was placed such that the cantilever arm was resting on the occlusal surface of the premolar included in the study. This provided a force apically in the vertical direction. The 3shape ortho analyzer program was used to assess the tooth movements using digital models. By superimposing the scanned models of T0 and T3 of each patient, the overall extent of intrusion was determined. To compare the level of intrusion in the study group, a parametric Independent t-test was used. Results : The mean distance between the standard occlusal plane and the premolar subjected to orthodontic intrusion was calculated. There was a statistically significant change (p=0.002) in the level of intrusion before treatment and after 12 weeks. Conclusion : The study examined the use of intraoral scanners to monitor intricate orthodontic tooth movements in patients subjected to fixed appliance therapy. Intraoral scanners could provide valuable periodic assessments, potentially improving the overall quality and outcomes of orthodontic therapy.