An in vitro evaluation of aligner force decay in artificial saliva

Chen, Shou-Min; Ho, Chun‐Te; Huang, Tsui‐Hsien; Kao, Chia‐Tze

doi:10.1016/j.jds.2023.04.017

Cited by 4 publications

(1 citation statement)

References 25 publications

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“… 11 In a study using 0.75 mm Duran T as the aligner sheet, when the sheet was expanded by 0.2 mm and immersed in artificial saliva for 1, 4, and 7 days, the residual strengths measured with a thin-film pressure sensor were 94%, 90%, and 85%, respectively. 14 In this study, when 0.75 mm Duran T aligner sheets were immersed in artificial saliva for 1, 4, and 7 days and subjected to a three-point bending test, the measured residual strengths were similar at 94%, 79%, and 74%, respectively. Although the thickness of the aligner sheets decreases after thermoplastic forming, the formed shape limits the release of residual stress, resulting in a higher rate of strength degradation in the three-point test compared to the forming aligners.…”

Section: Discussionmentioning

confidence: 68%

Force degradation study on aligner plates immersed in various solutions

Chen

Huang

et al. 2023

Journal of Dental Sciences

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Section: Discussionmentioning

confidence: 68%

Force degradation study on aligner plates immersed in various solutions

Chen

Huang

et al. 2023

Journal of Dental Sciences

Self Cite

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Effects of Attachment Design and Aligner Material on Mandibular Canine Distal Bodily Movement in Aligner Treatment

Chen,

Huang,

et al. 2024

J. Med. Biol. Eng.

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Purpose Dental crowding is a result of a mismatch between tooth size and arch dimensions, which leads to malocclusion; treatment often involves premolar extraction before orthodontic alignment. Clear aligners are limited in their ability to achieve canine distal bodily movement, a common orthodontic maneuver. This study investigated the impacts of attachment design and aligner material on the efficacy of canine distal bodily movement. Methods A finite element analysis was conducted to examine the impact of various attachment designs and two aligner materials, thermoplastic polyurethanes/polycarbonate (TPU/PC) and polyethylene terephthalate glycol-modified (PETG), on mandibular canine distal bodily movement. The investigation focused on the biomechanical responses in the periodontal ligament (PDL) and surrounding alveolar bone. Results Attachment configuration exerted a strong influence on mandibular canine movement. Vertically oriented attachment pairs positioned mesially (mesial occlusal–mesial cervical) resulted in the most effective canine distal bodily movement, followed by a rectangular attachment. TPU/PC aligners induced slightly higher principal stresses in the PDL and von Mises stress and strain in the surrounding alveolar bone compared with PETG aligners; however, the difference was negligible, amounting to less than 6%. Conclusion Attachment design, specifically vertically oriented pairs positioned mesially (mesial occlusal–mesial cervical), was determined to be the crucial factor influencing the efficacy of canine distal bodily movement. The choice of aligner material (TPU/PC or PETG) has minimal impact on this orthodontic procedure.

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