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Abstract：
OBJECTIVE: To evaluate the morphometric changes in maxillary and mandibular anterior alveolar bone after orthodontic treatment and retention for 18-24 months by cone-beam computed tomography (CBCT).
METHODS: Thirty-four adolescent patients (12 males and 22 females; mean age: 14.29 ± 1.24 years) diagnosed with bimaxillary dentoalveolar protrusion and with extractions of the 4 first premolars were included.
METHODS: The labial and lingual (palatal) alveolar bone thickness, height and root length of the maxillary and mandibular anterior teeth were assessed using CBCT imaging at the pre-treatment (T1), post-treatment (T2) and retention phases (T3). Voxel-based superimpositions of the T2 and T3 images were performed, and the distances of incisal and apical movement between T2 and T3 were measured to determine whether relapses occurred.
RESULTS: After orthodontic treatment, the labial and lingual (palatal) bone height decreased significantly (P < .05) and the labial thickness at the crestal (L1), midroot (L2), and apical levels (L3) had no significant change, while the lingual (palatal) bone thickness at all three levels decreased significantly (P < .05). After 18-24 months of retention, the lingual (palatal) height and the lingual (palatal) thickness at the crestal (L1) level increased significantly (P < .05). There were no obvious incisal and apical movements of the anterior teeth between T2 and T3 (P > .05), indicating that no relapses occurred.
CONCLUSIONS: Even though lingual (palatal) alveolar loss occurred due to the orthodontic treatment, the cervical alveolar bone seemed to recover over time. Therefore, appropriate camouflage treatment can be used in patients with bimaxillary dentoalveolar protrusion, and this treatment will not irreversibly deteriorate periodontal health and affect the orthodontic treatment stability.
METHODS: Thirty-four adolescent patients (12 males and 22 females; mean age: 14.29 ± 1.24 years) diagnosed with bimaxillary dentoalveolar protrusion and with extractions of the 4 first premolars were included.
METHODS: The labial and lingual (palatal) alveolar bone thickness, height and root length of the maxillary and mandibular anterior teeth were assessed using CBCT imaging at the pre-treatment (T1), post-treatment (T2) and retention phases (T3). Voxel-based superimpositions of the T2 and T3 images were performed, and the distances of incisal and apical movement between T2 and T3 were measured to determine whether relapses occurred.
RESULTS: After orthodontic treatment, the labial and lingual (palatal) bone height decreased significantly (P < .05) and the labial thickness at the crestal (L1), midroot (L2), and apical levels (L3) had no significant change, while the lingual (palatal) bone thickness at all three levels decreased significantly (P < .05). After 18-24 months of retention, the lingual (palatal) height and the lingual (palatal) thickness at the crestal (L1) level increased significantly (P < .05). There were no obvious incisal and apical movements of the anterior teeth between T2 and T3 (P > .05), indicating that no relapses occurred.
CONCLUSIONS: Even though lingual (palatal) alveolar loss occurred due to the orthodontic treatment, the cervical alveolar bone seemed to recover over time. Therefore, appropriate camouflage treatment can be used in patients with bimaxillary dentoalveolar protrusion, and this treatment will not irreversibly deteriorate periodontal health and affect the orthodontic treatment stability.
摘要：
目的：通过锥形束计算机断层扫描（CBCT）评估正畸治疗和保留18-24个月后上颌和下颌前牙槽骨的形态变化。
方法：纳入34例青少年患者（男12例，女22例；平均年龄：14.29±1.24岁），诊断为双颌牙槽突突，并拔除了4个第一前磨牙。
方法：唇和舌（腭）牙槽骨厚度，在治疗前（T1）使用CBCT成像评估上颌和下颌前牙的高度和根长，后处理（T2）和保留期（T3）。对T2和T3图像进行基于体素的叠加，测量T2和T3之间的切点和根尖运动距离以确定是否发生复发。
结果：正畸治疗后，唇和舌（腭）骨高度显着下降（P<.05）和唇骨厚度（L1），中根(L2),根尖水平（L3）无明显变化，而三个层面的舌（腭）骨厚度均显著下降（P<0.05）。保留18-24个月后，舌部（腭）高度和舌部（腭）厚度显著增加（P<0.05）。在T2和T3之间，前牙没有明显的切牙和根尖运动（P>0.05）。表明没有复发。
结论：尽管由于正畸治疗而发生了舌（腭）牙槽丢失，宫颈牙槽骨似乎随着时间的推移而恢复。因此,适当的伪装治疗可用于双颌牙槽突症患者，这种治疗不会不可逆地恶化牙周健康和影响正畸治疗的稳定性。
方法：纳入34例青少年患者（男12例，女22例；平均年龄：14.29±1.24岁），诊断为双颌牙槽突突，并拔除了4个第一前磨牙。
方法：唇和舌（腭）牙槽骨厚度，在治疗前（T1）使用CBCT成像评估上颌和下颌前牙的高度和根长，后处理（T2）和保留期（T3）。对T2和T3图像进行基于体素的叠加，测量T2和T3之间的切点和根尖运动距离以确定是否发生复发。
结果：正畸治疗后，唇和舌（腭）骨高度显着下降（P<.05）和唇骨厚度（L1），中根(L2),根尖水平（L3）无明显变化，而三个层面的舌（腭）骨厚度均显著下降（P<0.05）。保留18-24个月后，舌部（腭）高度和舌部（腭）厚度显著增加（P<0.05）。在T2和T3之间，前牙没有明显的切牙和根尖运动（P>0.05）。表明没有复发。
结论：尽管由于正畸治疗而发生了舌（腭）牙槽丢失，宫颈牙槽骨似乎随着时间的推移而恢复。因此,适当的伪装治疗可用于双颌牙槽突症患者，这种治疗不会不可逆地恶化牙周健康和影响正畸治疗的稳定性。
