Incidence and risk factors of alveolar bone dehiscences and fenestrations after clear aligner therapy with Class II elastics: a retrospective study

作者：Chenxu Wang, Yang Zhao, Feng Guo, Houxuan Li, Lang Lei · 发表于：BMC Oral Health · 年份：2025 · DOI：10.1186/s12903-025-06023-0 · 被引用次数：4 · 研究领域：Orthodontics and Dentofacial Orthopedics、dental development and anomalies、Dental Implant Techniques and Outcomes

BACKGROUND: In clear aligner therapy (CAT), Class II elastics are widely used to reinforce the anchorage during the distalization of upper molars, however, their association with alveolar bone dehiscences (ABDs) and fenestrations (ABFs) in the anterior region remains unclear. The aim of this research is to assess the incidence of ABDs/ABFs in adult patients undergoing non-extraction CAT with Class II elastics, and to explore risk factors associated with the occurrence of ABDs/ABFs. METHODS: Thirty adult patients with Class II malocclusion who underwent non-extraction CAT with Class II intermaxillary elastics were enrolled in this study. Cone-beam computed tomography (CBCT) images were obtained before (T0) and immediately after (T1) CAT to assess the occurrence of ABDs/ABFs on the labial and lingual sides of anterior teeth. Chi-square tests were used to compare the incidence of ABDs/ABFs at T0 and T1, meanwhile, binary logistic regression was utilized to analyze the risk factors associated with ABDs/ABFs at T1. RESULTS: On the labial side, the incidence of ABDs increased significantly in the mandibular central incisors (from 36.7 to 62.8%, P < 0.05), mandibular lateral incisors (from 36.7 to 70.0%, P < 0.05), mandibular canines (from 31.7 to 53.3%, P < 0.05) and maxillary canines (from 30.0 to 55.0%, P < 0.05). While on the lingual side, it increased significantly in the maxillary central incisors (from 1.7 to 23.3%, P < 0.05), lateral incisors (from 6.7 to 38.3%, P < 0.05), a...