Aug 2026· American Journal of Orthodontics and Dentofacial Orthopedics· 0 citations· 36 references
Medicine
TL;DR
The achieved rotation of maxillary canines after the wear of an initial series of Invisalign aligners differed from the planned movements in both magnitude and direction for planned rotations of ≥5°.
Abstract
INTRODUCTION
This retrospective study aimed to assess the accuracy of planned moderate-to-severe rotation changes (≥5°) of maxillary canines with the Invisalign (Align Technology, Tempe, Ariz) appliance. The secondary aim was to evaluate the influence of the planned rotation direction on the accuracy.
Methods
Digital models representing the initial malocclusion, the planned occlusions, and the achieved occlusions after the wear of an initial series of Invisalign aligners by adult patients were measured using metrology software. A method to define rotation directions was formulated. The sample was then divided into 5 categories by rotation type: mesial-in, mesial-out, distal-in, distal-out, and combination rotations. This categorization enabled subsequent analyses to determine whether the planned rotation directions were met and whether rotation direction influenced accuracy.
Results
A total of 114 maxillary canines from 75 patients satisfied the inclusion criteria. Overall, the mean accuracy of the planned rotation was 64%. Rotation direction had no statistically significant influence on the accuracy of the planned rotations. Planned rotation directions were achieved in 77% of the maxillary canines evaluated. Combination rotations demonstrated the greatest variability, with 51% rotating in a direction other than that planned. A 1° increase in rotational velocity per aligner correlated with a 5.35° shortfall in the accuracy of this rotation (P < 0.05).
Conclusions
The achieved rotation of maxillary canines after the wear of an initial series of Invisalign aligners differed from the planned movements in both magnitude and direction for planned rotations of ≥5°. A method for classifying rotation types was developed, which may facilitate further research to guide clinicians and optimize treatment outcomes.
The findings can help clinicians better understand the planning of space opening for PMLIs before clear aligner therapy commences and provide baseline information for future research.
Maurice J Meade, Yannii Pouferis, T. Weir· American Journal of Orthodon...· 0 citations
The results of individual studies suggest that aligners could be a viable technique for the correction of mild to moderate open bite with good vertical control in contrast to deep bite malocclusions where treatment efficacy is still limited.
Hajar Ben Mohimd, Houda Neani, F. Zaoui et al.· Journal of Orofacial Orthope...· 0 citations
Objective To evaluate the three-dimensional movements of ectopically erupted maxillary canines (EEMCs) during orthodontic leveling and alignment with continuous archwires. Methods Eight patients with EEMCs were treated with a 0.014-inch CuNiTi archwire fully seated in self-ligating maxillary brackets. Seven intraoral scans were obtained per patient from baseline (T1) to 12 weeks thereafter (T2–T7). Geometric morphometric analysis incorporating principal component analysis (PCA) examined the (1) positional and angular changes of the EEMC and adjacent teeth and (2) alterations in the triangular relationship formed by the brackets of the lateral incisors, canines, and premolars. Results The PCA revealed consistent EEMC extrusion, despite differences in the initial conditions, with the canines reaching apicocoronal alignment with the neighboring teeth after 12 weeks. All EEMCs showed uprighting. The triangular bracket configuration changed systematically, with the distance between the lateral incisor and premolar increasing as the canine was extruded. Conclusions Despite the small sample size, this brief report revealed a consistent space-opening effect and EEMC uprighting during alignment.
Linda Schwarz, Philipp Mitteroecker, M. Bertl· The Korean Journal of Orthod...· 0 citations
Investigation of transverse dental changes following modified asymmetric rapid palatal expansion (ARPE) based on cone-beam computed tomography (CBCT) records found modified ARPE may be beneficial for treatment of a unilateral CB.
Guzin Bilgin Buyuknacar, Mehmet Ali Yavan· Applied Sciences· 0 citations
Patients with a thin gingival biotype have increased risk of periodontal recession and reduction of gingival thickness while retraction of anterior teeth, and Orthodontic treatments should consider appropriate measures to retract teeth keeping the biotype of gingiva in mind to preserve gingival health.
Muhammad Ihtisham Munawar, A. Afzal, Ehsan et al.· Pakistan Journal of Medical...· 0 citations
This study aimed to compare the accuracy of maxillary repositioning using 2 types of CAD/CAM-fabricated splints (the traditional intermediate wafer and a customized maxillary repositioning guide) with a specific focus on dental interferences between the upper and lower arches during maxilla-first orthognathic surgery. Patients who exhibited dental interferences after maxillary movement during surgical simulation were enrolled. The intermediate wafer was designed to virtually open the patient's mandible, thereby avoiding tooth interference, whereas the guide was created independently of dental contacts. Accuracy was assessed by superimposing postoperative cone-beam computed tomography images onto preoperative virtual simulation data. Eighteen patients were included, with 13 in the guide group and 5 in the wafer group. The absolute error distance was larger in the wafer group for all landmarks. Errors exceeding 2 and 1 mm were more frequent in the wafer group than in the guide group (P=0.01 and 0.43, respectively). However, no significant differences were found between groups for three-dimensional error distances at each reference point, and no consistent error direction was observed. The customized maxillary repositioning guide demonstrated superior accuracy within the 2 mm discrepancy range compared with the intermediate wafer, especially in situations requiring mandibular position modification for intermediate wafer fabrication.
Unknown authors· The Journal of craniofacial...· 0 citations
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