洪欣玉 1张文轩 1戚思瑶 1杨兰 1沈文欣 1刘剑1
作者信息
- 1. 南昌大学附属口腔医院正畸科 江西省口腔生物医学重点实验室江西省口腔疾病临床医学研究中心,南昌 330006
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摘要
Abstract
Objective 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 re-tracting anterior teeth with clear aligners.Methods This retrospective study included 15 patients(2 males and 13 fe-males)with maxillary protrusion,who underwent bilateral maxillary first premolar extraction and anterior tooth retrac-tion with clear aligners.Cone beam computed tomogra-phy images were collected at T1,T2,and T3(≥18 mon-ths post-treatment)for the measurement of vertical alve-olar bone height(labial,palatal,mesial,and distal as-pects)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.Results 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 cervi-cal alveolar bone of the maxillary lateral incisors and canines exhibited significant thinning(P<0.05).At T3,the labio-palatal 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 al-veolar bone resorption during treatment and bone regeneration during retention(labial height of maxillary central inci-sors:r=-0.597,P<0.05).Conclusion 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 alve-olar bone thickness at the cervical and middle root levels of the upper lateral incisors and canines decreased remark-ably.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 pretreat-ment levels were not reached.Notably,the degree of bone resorption during treatment may influence the remodeling potential at T3.关键词
无托槽隐形矫治/前牙内收/上颌前突/牙槽骨高度/牙槽骨厚度Key words
clear aligner/anterior tooth retraction/maxillary protrusion/alveolar bone height/alveolar bone thickness分类
医药卫生
