Affiliation:
1. Stomatological Hospital of Chongqing Medical University Chongqing China
2. Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences Chongqing China
3. Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education Chongqing China
Abstract
AbstractObjectivesTo analyse the morphometric changes in the anterior alveolar bone of both the maxilla and mandible after space closure and retention for 18‐36 mo in adults and adolescents.Materials and MethodsForty‐two subjects with 4 first premolars extracted followed by retracting anterior teeth were included and divided into two age groups: adult group (4 males, 17 females, mean age: 23.67 ± 5.29 y, treatment duration: 27.95 mo, retention duration: 26.96 mo, ANB: 4.8 ± 2.1, U1‐L1: 117.2 ± 9.2, U1‐PP: 120.2 ± 7.2, L1‐MP: 99.2 ± 5.3) and adolescent group (6 males, 15 females, mean age: 11.52 ± 1.21 y, treatment duration: 26.18 mo, retention duration: 25.79 mo, ANB: 5.2 ± 2.1, U1‐L1: 116.0 ± 8.6, U1‐PP: 119.8 ± 4.9, L1‐MP: 99.7 ± 4.9). Alveolar bone height and thickness of anterior teeth in both groups were measured using cone beam computed tomography (CBCT) imaging performed at the pretreatment (T1), posttreatment (T2) and retention phases (T3). One‐way repeated‐measure ANOVAs were performed to evaluate the alveolar bone changes. Voxel‐based superimpositions were performed to measure the amount of tooth movement.ResultsAfter orthodontic treatment, the lingual bone height and thickness of both arches and the labial bone height of the mandible decreased significantly in both age groups (P < .05). Most of the labial bone height and thickness of the maxilla in both groups remained unchanged (P > .05). After retention, the lingual bone height and thickness increased significantly in both age groups (P < .05). The amounts of increased height ranged from 1.08 to 1.64 mm in adults and from 0.78 to 1.21 mm in adolescents, and the amounts of increased thickness ranged from 0.23 mm to 0.62 mm in adults and from 0.16 mm to 0.36 mm in adolescents. Obvious movements of the anterior teeth during retention were not found (P > .05).ConclusionsAlthough lingual alveolar bone loss occurred in adolescents and adults during orthodontic treatment, continuous remodelling occurred in the later retention phase, which provides a reference for clinical treatment planning of bimaxillary dentoalveolar protrusion.
Subject
Otorhinolaryngology,Oral Surgery,Surgery,Orthodontics
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献