Transverse and torque dental changes after passive self-ligating fixed therapy: A two-year follow-up study.

A new interesting article has been published in Am J Orthod Dentofacial Orthop. 2019 Jul;156(1):94-103. doi: 10.1016/j.ajodo.2018.08.019. and titled:

Transverse and torque dental changes after passive self-ligating fixed therapy: A two-year follow-up study.

Authors of this article are:

Lucchese A, Manuelli M, Albertini P, Ghislanzoni LH.

A summary of the article is shown below:

INTRODUCTION: Self-ligating appliances are purposed to expand the arches, but evidence on stability of the result is lacking. We measured the width of maxillary and mandibular arches and torque changes after treatment with the use of passive self-ligating appliances and assessed stability at the 2-year follow-up.METHODS: Maxillary and mandibular 3-dimensional (3D) models from 32 subjects (mean initial age 14.9 ± 0.9 years), consecutively treated with the use of self-ligating appliances, were obtained before, immediately after, and 2 years after treatment. Dental arches were examined with the use of 3D software to evaluate differences in transverse arch dimensions and torque values.RESULTS: An incremental increase of arch widths was recorded, especially regarding maxillary and mandibular premolars. The increase in the transverse diameters was associated with a significant positive torque gain. No significant changes in arch perimeter and depth were recorded. In the retention period, slight significant changes in transverse diameters were recorded, and a transverse diameter constriction detected. Torque values remained almost unchanged in the follow-up period.CONCLUSIONS: Transverse arch dimensions, along with torque values, increased significantly after treatment with the use of a passive self-ligating appliance. In the 2 years following treatment, a tendency to transverse diameter restriction, especially for the maxillary and mandibular premolars, was observed.Copyright © 2019 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.

Check out the article’s website on Pubmed for more information:



This article is a good source of information and a good way to become familiar with topics such as: Adolescent;Adult;Analysis of Variance;Bicuspid;Computer-Aided Design;Dental Arch;Dental Casting Technique;Dental Models;Female;Follow-Up Studies;Humans;Imaging, Three-Dimensional;Male;Malocclusion;Mandible;Maxilla;Nickel;Orthodontic Appliance Design;Software;Titanium;Tooth Crown;Tooth Movement Techniques;Treatment Outcome;Young Adult.

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