Effect of Aging of Orthodontic Aligners in Different Storage Media on Force and Torque Generation: An In Vitro Study

The aim of this study is to the effect aging in different media (deionized water and artificial saliva) on force/torque generation by thermoplastic orthodontic aligners. Ten thermoformed aligners, made Essix ACE® sheets, were aged deionized saliva over two weeks at 37 °C, five each medium. generated upper second premolar (Tooth 25) a resin model was measured day 0 (before aging), 2, 4, 6, 10, 14, using biomechanical test set-up. results showed that aligners storage agent has no significant impact their decay. No differences also found between stored nor saliva. vertical extrusion-intrusion forces range 1.4 4.6 N, horizontal oro-vestibular 1.3 2.5 while torques mesio-distal rotation 5.4 41.7 Nmm. It could be concluded influence only mechanical properties can classified as insignificant, difference or observed.