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KMID : 0361920210510020135
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Korean Journal of Orthodontics
2021 Volume.51 No. 2 p.135 ~ p.141
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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
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Palone Mario
Longo Mattia
Arveda Niki
Nacucchi Michele
De Pascalis Fabio
Spedicato Giorgio Alfredo
Siciliani Giuseppe
Lombardo Luca
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Abstract
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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.
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KEYWORD
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Gap width, Aligner thickness, Thermoforming procedure, Clear aligner therapy
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