Abstract
The purpose of this study is to evaluate the changes in the palatal alveolar bone thickness and find the factors related to the resorption of the palatal alveolar bone caused by tooth movement after the maxillary incisors were retracted and intruded during orthodontic treatment. The study group comprised of 33 skeletal Class II malocclusion patients who underwent extraction for orthodontic treatment. Palatal alveolar bone thickness changes and resorption factors were identified and analyzed. The changes of maxillary central incisors and palatal alveolar bone thickness were measured, and the corresponding sample t test was performed using SPSS (IBM SPSS version 22). The amount of palatal alveolar bone resorption was measured and various parameters were analyzed to determine which factors affected it. Correlation analysis adopting the amount of palatal alveolar bone resorption as a dependent variable demonstrated that the SNB, mandibular plane angle, and the inclination of the maxillary central incisor were significantly correlated with before treatment. On the other hand, mandibular plane angle, angle of convexity, the inclination of the upper incisor, and the occlusal plane (UOP, POP) were significantly correlated with post-treatment. In addition, the variables related to palatal contour (PP to PAS, SN to PAS, palatal surface angle) and occlusal planes (UOP/POP) were significantly correlated with the difference in palatal bone resorption. During initial diagnosis, high angle class II with normal upper incisor inclination can be signs of high-risk factors. In addition, maintaining the occlusal plane during treatment helps to prevent palatal bone loss.
Highlights
The purpose of this study is to evaluate the changes in the palatal alveolar bone thickness and to determine the factors related to the resorption of the palatal alveolar bone caused by tooth movement when the maxillary incisors were retracted and intruded during orthodontic treatment
The change of the palatal alveolar bone thickness following the retraction of maxillary central incisors was measured, and the correspondence sample t test analysis showed that R1–R5 moved 2.8 mm, 2.4 mm, 2.1 mm, 1.7 mm, 1.6 mm, on average, and T1–T5 reduced thickness by 0.8 mm, 0.61 mm, 0.39 mm, 022 mm, and 0.08 mm, respectively, based on the thickness of the calibration before and after the treatment and showed an average controlled tipping
Previous studies have shown that extraction treatment has a greater effect on root resorption and alveolar bone loss than non-extraction treatment[12], and in extraction treatment, the inclination and position of the anterior teeth played an important role in the stability of the treatment and function
Summary
The purpose of this study is to evaluate the changes in the palatal alveolar bone thickness and find the factors related to the resorption of the palatal alveolar bone caused by tooth movement after the maxillary incisors were retracted and intruded during orthodontic treatment. Correlation analysis adopting the amount of palatal alveolar bone resorption as a dependent variable demonstrated that the SNB, mandibular plane angle, and the inclination of the maxillary central incisor were significantly correlated with before treatment. If there is excessive lingual inclination of anterior teeth as a result of putting too much emphasis on the esthetic aspect without considering the alveolar bone remodeling response following orthodontic tooth movement, unwanted iatrogenic sequelae such as root resorption, alveolar bone loss and fenestration, dehiscence and gingival recession would likely occur[4,5,6,7,8,9,10]. Loss, and there is disagreement about whether the remodeling capacity of the alveolar bone can compensate for the bone loss in every c ase[1]
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