Three-dimensional finite element analysis of different pontic designs in the extraction area of clear aligners during the distalization of canine
- VernacularTitle:拔牙区域不同形式连接桥体在隐形矫治远移尖牙过程中的三维有限元分析
- Author:
Ziyuan GUO
1
;
Jiahui LI
;
Xizhong ZHANG
;
Yifan WANG
Author Information
- Publication Type:Journal Article
- Keywords: tooth abnormalities; orthodontic appliances; finite element analysis; clear aligner technology
- From: Tianjin Medical Journal 2025;53(7):741-746
- CountryChina
- Language:Chinese
- Abstract: Objective To explore the effect of different pontic designs in resisting stress interruption effect and roller coaster phenomenon through three-dimensional finite element analysis,providing clinical guidance for the application of clear aligners in extraction cases.Methods Four three-dimensional finite element models of different pontic designs in the extraction area of clear aligners were established,including the pontic-free connection design,the conventional hollow pontic design,the partially solid-filled pontic design and the fully solid-filled pontic design.All four aligner models were individually assembled with the dental arch model.A 0.2 mm distal movement of the canine was simulated to observe the initial displacement and periodontal ligament stress distribution of canine and second premolar in each group of models.Results The initial displacement tendency diagram revealed that in all experimental conditions,both the canine and second premolar exhibited tipping movement patterns.However,significant variations in initial displacement magnitudes were observed across different pontic designs.The fully solid-filled pontic-connected clear aligner model exhibited the greatest initial displacement values(both crown and root)and the maximum initial displacement magnitude.Notably,this kind of design displayed movement characteristics closer to bodily movement,indicating superior control efficacy in tooth positioning.Periodontal ligament stress analysis revealed that the fully solid-filled pontic-connected clear aligner model generated the highest maximum principal stress in the periodontal ligament.Conclusion This three-dimensional finite element study reveals that the application of solid-filled pontic in clear aligner therapy could improve biomechanical control at extraction sites by minimizing aligner distortion,reducing stress interruption effect and preventing the roller coaster phenomenon.
