Accuracy of maxillary molar distalization with clear aligners in three-dimension: a retrospective study based on CBCT superimposition

作者：Ruyue Qiang, Haolin Zhang, Yuerong Xu, Xu Zhang, Fang Jin, Zuolin Jin, Wen Qin, Jie Gao · 发表于：Clinical Oral Investigations · 年份：2025 · DOI：10.1007/s00784-025-06218-3 · 被引用次数：10 · 研究领域：Orthodontics and Dentofacial Orthopedics、Temporomandibular Joint Disorders、Cleft Lip and Palate Research

BACKGROUND: To measure the actual moving direction and displacement of the root and crown of maxillary teeth before and after treatment in molar distalization cases using clear aligners(CAs). MATERIALS AND METHODS: This retrospective study included 28 adult patients who received maxillary distalization treatment with CAs. The pre- and post-treatment CBCT were superimposed and the crown and root of all maxillary teeth were marked. Achieved and predicted three-dimensional displacement of maxillary teeth were then compared using the paired t test. Mixed-effect model was used to explore the influence of different staging design (one-molar distalization vs. two-molar distalization) and anchorage (TAD vs. Class II elastic vs. no extra anchorage management). RESULTS: Labial displacement happened to the anterior teeth even the palatal displacement was prescribed. Body distalization of maxillary posterior teeth could not be fully achieved as predicted. The premolars and molars achieved greater distal tipping, buccal inclination, and less distal displacement than predicted. In buccal-palatal dimension, the greatest buccal tipping tendency happened to the 2nd premolar and decreased toward the distal portion of the aligner. In the mesial-distal dimension, the highest accuracy of molar distalization was found in the 2nd molars while the lowest in the 1st premolars. No significant difference was found between two molar distalization patterns. Extra anchorage management devices could not di...