Department of Orthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China.
Department of Periodontology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Haidian District, Beijing, China.
Orthod Craniofac Res. 2021 Feb;24(1):87-95. doi: 10.1111/ocr.12408. Epub 2020 Jul 29.
To evaluate morphometric characteristics of alveolar bone around the incisors of high-angle skeletal class III patients receiving surgical orthodontic treatment.
Thirty high-angle skeletal class III patients (mean age, 20.94 ± 3.25 years) underwent cone-beam computed tomography before treatment (T0), after pre-surgical orthodontic treatment (T1) and after treatment (T2).
The vertical bone level (VBL), alveolar bone thickness (ABT), alveolar bone area (ABA) and position of upper and lower central incisors (UCIs and LCIs) were evaluated. The ABT included five levels (4, 6, 8 mm from the cemento-enamel junction, midroot and root apex level). One-way repeated measures ANOVA with Bonferroni's multiple-comparison test and matched t test was performed to compare variables.
Before treatment, the average labial ABT was approximately 1 mm in UCIs and 0.38 ~ 0.79 mm in LCIs, and the VBL of the LCIs was over 2 mm. After treatment, the VBL increased by 2.19 ± 1.96 mm (P < .001) on the lingual side of UCIs and 2.78 ± 2.29 mm and 3.09 ± 2.52 mm on the labial and lingual sides of LCIs, respectively (all P < .001). ABT at every level decreased significantly, decreasing by 1.66 ± 1.93 mm at the 8 mm level of UCIs and 1.06 ± 1.01 mm at the apex of LCIs (P < .001). The lingual ABA of UCIs and LCIs decreased by over 50% (P < .001).
In high-angle skeletal class III patients, the condition of alveolar bone around UCIs and LCIs was extremely poor before treatment. Further alveolar bone resorption occurred during surgical orthodontic treatment. More attention should be paid to the movement of anterior teeth in cases of severe alveolar bone loss.
评估接受正颌正畸治疗的高角骨骼 III 类患者切牙周围牙槽骨的形态特征。
30 例高角骨骼 III 类患者（平均年龄 20.94±3.25 岁）在治疗前（T0）、术前正畸治疗后（T1）和治疗后（T2）进行锥形束 CT 检查。
评估垂直骨水平（VBL）、牙槽骨厚度（ABT）、牙槽骨面积（ABA）和上、下中切牙（UCIs 和 LCIs）的位置。采用单因素重复测量方差分析和 Bonferroni 多重比较检验及配对 t 检验比较各变量。
治疗前，UCIs 的平均唇侧 ABT 约为 1mm，LCIs 为 0.38~0.79mm，LCIs 的 VBL 超过 2mm。治疗后，UCIs 舌侧 VBL 增加了 2.19±1.96mm（P<0.001），LCIs 唇侧和舌侧 VBL 分别增加了 2.78±2.29mm 和 3.09±2.52mm（均 P<0.001）。各部位 ABT 均显著降低，UCIs 8mm 处降低了 1.66±1.93mm，LCIs 根尖处降低了 1.06±1.01mm（均 P<0.001）。UCIs 和 LCIs 的舌侧 ABA 减少了 50%以上（P<0.001）。
在高角骨骼 III 类患者中，治疗前 UCIs 和 LCIs 周围牙槽骨状况极差。正颌正畸治疗过程中进一步发生牙槽骨吸收。在严重牙槽骨丧失的情况下，应更加注意前牙的移动。
