Abstract
BackgroundThis study was performed to evaluate the treatment effects of the antero-posterior lingual retractor (APLR), focusing on the 3-dimensional (3D) tooth movement of the maxillary anterior teeth and their alveolar bone levels.MethodsEn masse retraction was performed using either the C-lingual retractor (CLR, C-group, n = 9) or the antero-posterior lingual retractor (APLR, AP-group, n = 8). We evaluated 3D movement of the maxillary anterior teeth and alveolar bone levels, root length of the central incisors, long axes of the maxillary canines, and occlusal plane changes from CBCT images.ResultsAfter retraction, the central incisors were more significantly intruded and their root apex was more retracted in the AP-group. The long axis of the canine was well maintained in the AP-group. There were no differences in the steepness of occlusal plane and the incidence of alveolar bone loss or of root resorption during en masse retraction with the two retractors.ConclusionsThe clockwise bowing effect of the anterior segment was less with the APLR, which prevented unwanted canine movement.
Highlights
This study was performed to evaluate the treatment effects of the antero-posterior lingual retractor (APLR), focusing on the 3-dimensional (3D) tooth movement of the maxillary anterior teeth and their alveolar bone levels
An APLR consists of a C-lingual retractor (CLR) that is attached to the lingual surface of the six maxillary anterior teeth, a splinted segment of the posterior teeth, lever arms, and a tube to create a path for a guide bar
Alveolar bone level and root length (RL) changes of the maxillary central incisors Between the T0 and T1 stages, the labial alveolar bone levels were either maintained or increased, whereas the palatal alveolar bone levels significantly decreased in both groups (Table 3)
Summary
This study was performed to evaluate the treatment effects of the antero-posterior lingual retractor (APLR), focusing on the 3-dimensional (3D) tooth movement of the maxillary anterior teeth and their alveolar bone levels. The APLR produced a large amount of intrusion and retraction of the anterior teeth with alveolar bone remodeling in hyperdivergent Class II patients, and the alveolar bone volume on the pressure side was preserved [7]. Because this system has directional control, we hypothesized that it would
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