Micro-computed tomography evaluation of general trends in aligner thickness and gap width after thermoforming procedures involving six commercial clear aligners: An in vitro study
10.4041/kjod.2021.51.2.135
- Author:
Mario PALONE
1
;
Mattia LONGO
;
Niki ARVEDA
;
Michele NACUCCHI
;
Fabio De PASCALIS
;
Giorgio Alfredo SPEDICATO
;
Giuseppe SICILIANI
;
Luca LOMBARDO
Author Information
1. Postgraduate School of Orthodontics, University of Ferrara, Ferrara, Italy
- Publication Type:Brief Report
- From:The Korean Journal of Orthodontics
2021;51(2):135-141
- CountryRepublic of Korea
- Language:English
-
Abstract:
Objective:To assess the effects of thermoforming on aligner thickness and gap width in six aligner systems with the same nominal thickness.
Methods:Six passive upper aligners of different brands were adapted to a single printed cast. Each sample was evaluated with high-resolution micro-computed tomography.To investigate aligner thickness and gap width, two-dimensional (2D) analysis was conducted assessing the effects of the following variables: tooth type (central incisor, canine, and first molar), 2D reference points, and aligner type. Data were analyzed and compared using analysis of variance and Tukey’s post-hoc tests (p < 0.05).
Results:Tooth type, dental region, and aligner type affected both the gap width and aligner thickness. The aligner thickness remained moderately stable across the arch only in the F22.
Conclusions:All thermoformed samples displayed smaller aligner thickness and gap width at anterior teeth and both gingival and coronal centers than at posterior teeth and occlusal surfaces.
