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
Palone Mario, Longo Mattia, Arveda Niki, Nacucchi Michele, De Pascalis Fabio, Spedicato Giorgio Alfredo, Siciliani Giuseppe, Lombardo Luca,
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( Palone Mario ) - University of Ferrara Postgraduate School of Orthodontics
( Longo Mattia ) - University of Ferrara Postgraduate School of Orthodontics
( Arveda Niki ) - University of Ferrara Postgraduate School of Orthodontics
( Nacucchi Michele ) - Research Centre of Brindisi Division for Sustainable Materials
( De Pascalis Fabio ) - Research Centre of Brindisi Division for Sustainable Materials
( Spedicato Giorgio Alfredo ) - University of Bologna School of Economics, Management and Statistics
( Siciliani Giuseppe ) - University of Ferrara School of Dentistry Department of Translational Medicine
( Lombardo Luca ) - University of Ferrara Postgraduate School of Orthodontics
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.
키워드
Gap width; Aligner thickness; Thermoforming procedure; Clear aligner therapy
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