Stomatological Hospital of Chongqing Medical University, Chongqing, China.
Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.
Orthod Craniofac Res. 2023 Nov;26(4):618-631. doi: 10.1111/ocr.12657. Epub 2023 Apr 1.
To 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.
Forty-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.
After 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).
Although 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.
分析成年人和青少年在正畸治疗关闭间隙并保持 18-36 个月后上颌和下颌前牙槽骨的形态学变化。
共纳入 42 名因 4 颗第一前磨牙拔除而接受前牙内收治疗的患者，并将其分为两个年龄组：成年组（男性 4 名，女性 17 名，平均年龄 23.67±5.29 岁，治疗持续时间 27.95 个月，保持持续时间 26.96 个月，ANB：4.8±2.1，U1-L1：117.2±9.2，U1-PP：120.2±7.2，L1-MP：99.2±5.3）和青少年组（男性 6 名，女性 15 名，平均年龄 11.52±1.21 岁，治疗持续时间 26.18 个月，保持持续时间 25.79 个月，ANB：5.2±2.1，U1-L1：116.0±8.6，U1-PP：119.8±4.9，L1-MP：99.7±4.9）。使用锥形束计算机断层扫描（CBCT）在治疗前（T1）、治疗后（T2）和保持阶段（T3）对两组患者的牙槽骨高度和前牙厚度进行测量。采用单因素重复测量方差分析评估牙槽骨变化。进行体素叠加以测量牙齿移动量。
正畸治疗后，两组患者的上颌和下颌牙槽骨的舌侧高度和厚度以及下颌牙槽骨的唇侧高度均显著降低（P<.05）。两组患者的上颌牙槽骨的大部分唇侧高度和厚度保持不变（P>.05）。保持后，两组患者的牙槽骨舌侧高度和厚度均显著增加（P<.05）。成人的牙槽骨高度增加范围为 1.08-1.64mm，青少年为 0.78-1.21mm，牙槽骨厚度增加范围为 0.23-0.62mm，青少年为 0.16-0.36mm。在保持阶段未发现前牙明显移动（P>.05）。
尽管青少年和成年人在正畸治疗过程中出现了牙槽骨舌侧吸收，但在随后的保持阶段仍持续发生改建，这为双颌前突的临床治疗计划提供了参考。
