Alveolar bone height and thickness changes in the maxillary anterior region were assessed before treatment (T1), after treatment (T2), and during the retention phase (T3) in patients with maxillary protrusion treated with clear aligners combined with premolar extraction. The aim was to provide clinical insights for safely retracting anterior teeth with clear aligners. This retrospective study included 15 patients (2 males and 13 females) with maxillary protrusion, who underwent bilateral maxillary first premolar extraction and anterior tooth retraction with clear aligners. Cone beam computed tomography images were collected at T1, T2, and T3 (≥18 mon-ths post-treatment) for the measurement of vertical alveolar bone height (labial, palatal, mesial, and distal aspects) and horizontal alveolar bone thickness (labial, palatal, and total). Statistical analysis was performed using SPSS 26.0, and changes across phases and correlations were assessed. After orthodontic treatment, the palatal and mesial alveolar bone height of the maxillary anterior teeth significantly decreased (P<0.05). Concurrently, the labial midroot and apical thickness of the maxillary central incisors showed a significant increase, whereas the palatal cervical alveolar bone of the maxillary lateral incisors and canines exhibited significant thinning (P<0.05). At T3, the labiopalatal alveolar bone height of the maxillary central incisors significantly increased (palatal height increase: 0.46 mm±0.57 mm; P<0.05). Although the palatal alveolar bone thickness of the maxillary lateral incisors and canines continued to decrease, the differences were not statistically significant (P>0.05). A negative correlation was observed between alveolar bone resorption during treatment and bone regeneration during retention (labial height of maxillary central incisors: r=-0.597, P<0.05). After the retraction of maxillary anterior teeth with clear aligners, the alveolar bone height on the mesial and palatal sides of the upper anterior teeth showed considerable reduction. The palatal alveolar bone thickness at the cervical and middle root levels of the upper lateral incisors and canines decreased remarkably. By contrast, the labial alveolar bone thickness at the middle and apical root levels of the upper central incisors significantly increased. At T3-T2, the partial recovery of alveolar bone height and thickness was observed, but pretreatment levels were not reached. Notably, the degree of bone resorption during treatment may influence the remodeling potential at T3. 目的: 借助锥形束CT（CBCT）评估上颌前突患者运用无托槽隐形矫治技术拔牙矫治前（T1）、后（T2）及保持期（T3）的上颌前牙区牙槽骨高度与厚度变化，为临床上使用无托槽隐形矫治器安全内收前牙提供一定参考。方法: 本回顾性研究纳入15例上颌前突患者（男性2例，女性13例），拔除2颗上颌第一前磨牙并采用无托槽隐形矫治技术内收前牙。收集患者治疗前、治疗后及随访期的CBCT影像资料，测量上颌前牙区各牙位唇腭侧、近远中向牙槽骨高度，唇腭侧、总牙槽骨厚度变化。采用SPSS 26.0软件对测量数据进行统计学分析，探究正畸阶段与保持阶段牙槽骨高度、厚度的变化情况，并检验2个阶段牙槽骨变化的相关性。结果: 正畸治疗后，上颌前牙腭侧及近中牙槽骨高度显著减小（P<0.05），上颌中切牙唇侧根中、根尖部厚度显著增加，上颌侧切牙、上颌尖牙腭侧根颈部牙槽骨显著变薄（P<0.05）。保持阶段上颌中切牙唇腭侧牙槽骨高度显著增加（腭侧牙槽骨高度增加量0.46±0.57 mm，P<0.05），上颌侧切牙、尖牙腭侧牙槽骨厚度持续减小，但差异不具有统计学意义（P>0.05）。治疗期牙槽骨吸收量与保持期牙槽骨再生量呈负相关（上颌中切牙唇侧高度r=-0.597，P<0.05）。结论: 使用无托槽隐形矫治器内收上前牙后，治疗前后相比，上颌前牙近中、腭侧牙槽骨高度显著降低;上颌侧切牙、上颌尖牙根颈部及根中部腭侧牙槽骨厚度显著减少，上颌中切牙唇侧牙槽骨厚度在根中、根尖部显著增加。保持期牙槽骨高度和厚度部分恢复，但未达治疗前水平，治疗期骨吸收程度可能影响保持期修复潜力。.
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