Comparação tridimensional dos movimentos ortodônticos de rotação, inclinação e angulação planejados e obtidos em dentes anteriores com alinhadores transparentes: um estudo retrospectivo

Abstract

Removable transparent aligners are increasingly being used, and due to its popularity new companies are emerging in the market. Therefore, it is important to evaluate the movement accuracy of these devices. The aim of this study was to compare digitally planned orthodontic movements of rotation, vestibulolingual tip, and mesiodistal tip with the clinical movements obtained in anterior teeth using transparent orthodontic aligners from a Brazilian manufacturer (Smart Aligner®) in a three-dimensional manner. The sample size was calculated and the methodology was applied to 28 patients. It could be observed that for mesiodistal tip movements in the upper arch, the average error between the planned and obtained movements of each group ranged from 5.04° to 7.62°; in the lower arch, from 5.63° to 7.47°. For rotation movements in the upper arch, it ranged from 4.5° to 6.63°, and in the lower arch, from 5.84° to 6.56°. For vestibulolingual tip movements, in the upper arch it ranged from 2.81° to 3.01°, and in the lower arch from 2.55° to 3.58°. Using the Kruskal-Wallis test with Bonferroni correction to compare the movements performed, a statistically significant difference was detected between the planned and actually achieved movements in this sample. When comparing what was simulated with the obtained results, a statistically significant difference was observed only when comparing vestibulolingual tip with rotation and vestibulolingual tip with mesiodistal tip. There was no significant difference when comparing mesiodistal tip with rotation. It can be concluded that there is a difference between planned and obtained movements of rotation, vestibulolingual tip, and mesiodistal tip using transparent aligners. Despite the high average discrepancy between planned and obtained movements, the standard deviation showed a similar order of magnitude, indicating both positive and negative results. Among the movements studied, vestibulolingual tip was the movement that showed the most accurate results.