In the invisible orthodontic treatment, composite thermoforming film materials have become the focus of orthodontic clear aligners. The orthodontic efficacy of clear aligners which consisted of multi-layers materials remains unclear. This study aims to evaluate the biomechanical effects of various multi-layers of clear aligners on en-mass retraction of maxillary anterior teeth.A patient-specific 3D non-linear finite element model numerical analysis was constructed to simulate the en-mass retraction of maxillary anterior teeth with clear aligner after extraction of the first premolars. Four kinds of multi-layers clear aligners with different proportion of film materials were simulated. The biomechanical responses of four different clear aligners on invisible orthodontics were calculated. The tooth displacement in all directions, the hydrostatic pressure of periodontal ligament, the orthodontic deformation of clear aligner, and the stress distribution of alveolar bone were compared and investigated.In all experimental models, the maximum equivalent deformation of alveolar bone, the vector displacement of tooth and the compressive/tensile stress of periodontal ligament decreased with the increase of soft layer thickness. The elastic strain of clear aligners also decreased with the increase of the ratio of soft/hard layers.The multi-layers clear aligner is better than the single-layer clear aligner in tooth movement, stress distribution of periodontal ligament and mechanical loading of alveolar bone, especially when the ratio of soft layer to hard layer is more than 50%. Moreover, the side effects of the multi-layers clear aligner are significantly less than those of the single-layer one.

Lurong Jia

Chunjuan Wang

Chao Wang

Jinlin Song

Yubo Fan

Computer Methods in Biomechanics & Biomedical Engineering

生物力学和生物医学工程中的计算机方法的主要目的是提供一种交流生物力学和生物医学工程领域正在取得的进展的方法，并激发人们对这些多学科学科中不断出现的基于计算机的技术的兴趣。生物力学和生物医学工程中的计算机方法也将重点关注将工程学科与医学技术和临床专业知识相结合的重要性。这种整合将对未来的医疗保健产生重大影响。

The primary aim of the journal "Computer Methods in Biomechanics and Biomedical Engineering" is to provide a platform for communicating the latest advancements in the fields of biomechanics and biomedical engineering, while also stimulating interest in the emerging computer-based technologies within these multidisciplinary areas. The journal will emphasize the importance of integrating engineering disciplines with medical technologies and clinical expertise, which will have a significant impact on the future of healthcare.

《Computer Methods in Biomechanics and Biomedical Engineering》期刊的主要目的是提供一个交流生物力学和生物医学工程领域最新进展的平台，并激发对这些多学科领域中不断涌现的计算机技术的兴趣。该期刊还将重点关注工程学科与医学技术及临床专业知识结合的重要性，这种整合将对未来的医疗保健产生深远的影响。

Computer Methods in Biomechanics and Biomedical Engineering

Efficacy of various multi-layers of orthodontic clear aligners: a simulated study

The multi-layersclear aligner is better than the single-layer clear aligner in tooth movement, stress distribution of periodontal ligament and mechanical loading of alveolar bone, especially when the ratio of soft layer to hard layer is more than 50%.

Category	Quartile
医学	4
医学, 计算机跨学科应用	4
医学, 工程生物医学	4

Efficacy of various multi-layers of orthodontic clear aligners: a simulated study

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Journal Info

Category	Quartile
ENGINEERING, BIOMEDICAL	3