Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Effect of Thermomechanical Aging of Orthodontic Aligners on Force and Torque Generation: An in vitro Study

Version 1 : Received: 15 February 2023 / Approved: 17 February 2023 / Online: 17 February 2023 (07:07:06 CET)

A peer-reviewed article of this Preprint also exists.

Elshazly T M, Nang D, Golkhani B, et al. Effect of thermomechanical aging of orthodontic aligners on force and torque generation: An in vitro study[J]. Journal of the Mechanical Behavior of Biomedical Materials, 2023: 105911. Elshazly T M, Nang D, Golkhani B, et al. Effect of thermomechanical aging of orthodontic aligners on force and torque generation: An in vitro study[J]. Journal of the Mechanical Behavior of Biomedical Materials, 2023: 105911.

Abstract

The aim of the study is to investigate the effects of artificial aging by thermocycling and mechanical loading on force/torque delivery by thermoplastic orthodontic aligners. Ten thermoformed aligners made of Zendura™ thermoplastic polyurethane sheets were aged over two weeks in deionized water by thermocycling alone (n=5) and by both thermocycling and mechanical loading (n=5). The force/torque generated on upper second premolar (Tooth 25) of a plastic model was measured before aging (as control), and after 2, 4, 6, 10, and 14 days of aging, using a biomechanical set-up. Before aging, the extrusion-intrusion forces were in the range of 2.4 to 3.0 N, the oro-vestibular forces were 1.8 to 2.0 N, and the torques on mesio-distal rotation were 13.6 to 40.0 Nmm. Pure thermocycling had no significant effect on the force decay of the aligners. However, there was a significant decrease in force/torque after 2 days of aging for both thermocycling and mechanical loading aging group, which is no longer significant over 14 days of aging. In conclusion, artificial aging of aligners in deionized water with thermocycling and mechanical loading results in a significant decrease in force/torque generation. However, the mechanical loading of aligners has a greater impact than thermocycling alone.

Keywords

Dentistry; Orthodontics; Biomechanics; Torque; Force; Tooth Movement; Removable Thermoplastic Appliance; Thermoforming; Aging.

Subject

Medicine and Pharmacology, Dentistry and Oral Surgery

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