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

作者全名："Jia, Lurong; Wang, Chunjuan; Wang, Chao; Song, Jinlin; Fan, Yubo"

作者地址："[Jia, Lurong; Wang, Chunjuan; Song, Jinlin] Chongqing Key Lab Oral Dis & Biomed Sci, Chongqing, Peoples R China; [Jia, Lurong; Wang, Chunjuan; Wang, Chao; Song, Jinlin] Chongqing Med Univ, Stomatol Hosp, Chongqing, Peoples R China; [Wang, Chao; Fan, Yubo] Beihang Univ, Beijing Adv Innovat Ctr Biomed Engn, Beijing, Peoples R China; [Song, Jinlin] Chongqing Municipal Key Lab Oral Biomed Engn High, Chongqing, Peoples R China; [Wang, Chao; Fan, Yubo] Beihang Univ, Minist Educ, Key Lab Biomech & Mechanobiol, Beijing 100191, Peoples R China"

通信作者："Song, JL (通讯作者)，Chongqing Key Lab Oral Dis & Biomed Sci, Chongqing, Peoples R China.; Wang, C; Song, JL (通讯作者)，Chongqing Med Univ, Stomatol Hosp, Chongqing, Peoples R China.; Wang, C (通讯作者)，Beihang Univ, Beijing Adv Innovat Ctr Biomed Engn, Beijing, Peoples R China.; Song, JL (通讯作者)，Chongqing Municipal Key Lab Oral Biomed Engn High, Chongqing, Peoples R China.; Wang, C (通讯作者)，Beihang Univ, Minist Educ, Key Lab Biomech & Mechanobiol, Beijing 100191, Peoples R China."

来源：COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING

ESI学科分类：COMPUTER SCIENCE

WOS号：WOS:000758610100001

JCR分区：Q4

影响因子：1.6

年份：2022

卷号：　

期号：　

开始页：　

结束页：　

文献类型：Article; Early Access

关键词：3D finite element analysis; orthodontic tooth movement; multi-layers of clear aligners; biomechanical properties; en-mass retraction of anterior teeth

摘要："Background: 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. Methods: 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. Results: 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. Conclusions: 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."

基金机构："National Natural Science Foundation of China [11872135, 12072055, 12172034, U20A20390]; Natural Science Foundation of Beijing [L212063]; Chongqing Graduate Tutor Team, China"

基金资助正文："The authors gratefully acknowledge the support from the National Natural Science Foundation of China (Grant No. 11872135, Grant No. 12072055, Grant No. 12172034 and Grant No. U20A20390), Natural Science Foundation of Beijing (Grant No. L212063) and Chongqing Graduate Tutor Team, China (2019)."