Effect of 3D anchorage attachment on the alleviating tipping/extrusion of premolars for en-mass distalization of maxillary molars with clear aligners:A finite element study  

作　　者：Lurong Jia Chunjuan Wang Yao He Chao Wang Antonio Apicella Jinlin Song Yubo Fan 

机构地区：[1]Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences,Chongqing,China [2]Stomatological Hospital of Chongqing Medical University,Chongqing,China [3]Key Laboratory of Biomechanics and Mechanobiology,Ministry of Education,Beijing Advanced Innovation Center for Biomedical Engineering,School of Biological Science and Medical Engineering,School of Engineering Medicine,Beihang University,Beijing,China [4]Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education,Chongqing,China [5]Polytechnique School of Engineering and Base Science,University of Campania,Italy

出　　处：《Medicine in Novel Technology and Devices》2023年第2期272-280,共9页医学中新技术与新装备（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.12072055,11872135,U20A20390,U22A20314);Natural Science Foundation of Beijing(Grant No.L212063);the Fundamental Research Funds for the Central Universities,the 111 Project(No.B13003);the National Research Program of China(Grant No.2022YFC2504200);Orthodontic research project of youth clinical research fund of Chinese Stomatological Association(Grant No.CSA-O2020-07);Municipal graduate tutor team construction project(dstd201903).

摘　　要：This study aimed to explore the optimal invisible orthodontic force system during the en-mass distalization of two maxillary molars to minimize the side effect of anchorage loss by changing the direction of the application of the orthodontic force system.A high bio-fidelity 3D finite element model including maxilla,periodontal ligament,dentition,clear aligner,3D anchorage attachment and mini-implant was established.Different lengths of lateral hooks of 3D-printed anchorage attachments and mini-implant positions into the palatal alveolus were considered.A 200 g distal force was applied to the lateral hooks of different horizontal lengths(3.26 mm,6.52 mm and 9.78 mm)with the mini-implant as the application point.Using ABAQUS software,orthodontic tooth movements under 12 different clinical treatment designs were analyzed and calculated.The 3D anchorage attachment enhanced the anchorage of anterior teeth and alleviated the tipping/extrusion of premolars.In contrast to without clear aligners,length of the lateral hook had a negligible effect on both mesial tipping and buccal tipping with clear aligners,which could then be ignored.The change in mesial tipping was less and nearly remained constant despite of the different heights of the mini-implant.The 3D anchorage attachment assisted clear aligner can avoid the side effects of anterior tooth proclination caused by insufficient anchorage.The length of the lateral hook,and height of the mini-implant in this invisible orthodontic force system hardly affects the tooth movement of anchorage units.Clear aligners can effectively control the rotation and tipping of anchorage units caused by 3D anchorage attachment.

关 键 词：Clear aligner ORTHODONTICS 3D printing Three-dimensional finite element ATTACHMENTS Reinforced anchorage 

分 类 号：R783[医药卫生—口腔医学]