Abstract
This study aimed to assess the accuracy of a method of predicting post-movement root position during orthodontic treatment using a 3D digital crown/root model (3DCRM) created with pre-movement records of both cone-beam computed tomography (CBCT) and dental arch digital scans. Pre- and post-movement CBCT scans and dental arch digital scans of five patients who had completed orthodontic treatments were used in this study. The 3DCRM was superimposed onto the post-movement scanned dental arch to identify the post-movement root position (test method). Post-movement CBCT (referenced as the current method) served as the control to identify the actual post-movement root position. 3D-coordinate analysis revealed no significant differences between the test and current methods along the X and Y axes. However, the discrepancy on the Z axis (especially in cases of intrusion) was greater than that in all other directions for all three tooth types examined (p < 0.05). A strong positive correlation between the degree of discrepancy and the distance of tooth movement was observed on the Z axis (r = 0.71). The 3DCRM method showed promising potential to accurately predict root position during orthodontic treatments without the need for a second CBCT. However, root resorption, which affected the Z axis prediction, needs to be closely monitored using periapical radiographs to complement this method.
Highlights
Introduction iationsThe goal of orthodontic treatment is to establish ideal three-dimensional crown and root position in a functional, stable, and esthetic occlusion
Creating 3D digital crown/root models (3DCRM) by integrating digital scan crowns and cone-beam computed tomography (CBCT) root with patient data has become a feasible approach. This method first introduced by Lee et al in 2014 will be an ideal modality. This is a retrospective study using clinical cases, and the aims of this study were (1) to assess the accuracy of this new method of predicting post-movement root position compared to the current method of using post-movement CBCT, (2) to analyze the association of accurately predicting the root position in each of the three tooth types, and (3) to analyze the association between the accuracy of the test method and the amount of actual root apex movement
The pre- and post-movement CBCT images and scanned dental arches were obtained from the patient database of the Division of Orthodontics, Tomography 2022, 8 dental arches were obtained from the patient database of the Division of Orthodontic
Summary
The goal of orthodontic treatment is to establish ideal three-dimensional crown and root position in a functional, stable, and esthetic occlusion. Proper root position and parallelism are imperative for adequate occlusal function, periodontal health, implant placement, and restorative treatment [2,3,4,5]. Root position and parallelism are important factors for achieving even distribution of occlusal forces to create an ideal function and for establishing proper contours and emergence profiles of restorations [2,3,4,5]. Root proximity may lead to rapid periodontal breakdown and horizontal bone loss instead of intrabony defects that are amenable to regeneration [6,7,8,9,10,11].
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