Biomechanical analysis for different mandibular total distalization methods with clear aligners: A finite element study
오세웅, 최윤경, 김성훈, Ko Ching-Chang, 김기범, 김용일,
소속 상세정보
오세웅 ( Oh Se-Woong ) -
최윤경 ( Choi Youn-Kyung ) - Pusan National University Hospital Department of Orthodontics
김성훈 ( Kim Sung-Hun ) -
( Ko Ching-Chang ) -
김기범 ( Kim Ki-Beom ) - Saint Louis University Department of Orthodontics
김용일 ( Kim Yong-il ) -
Abstract
Objective: The purpose of this finite element method (FEM) study was to analyze the biomechanical differences and tooth displacement patterns according to the traction direction, methods, and sites for total distalization of the mandibular dentition using clear aligner treatment (CAT).
Methods: A finite element analysis was performed on four FEM models using different traction methods (via a precision cut hook or button) and traction sites (mandibular canine or first premolar). A distalization force of 1.5 N was applied to the traction site by changing the direction from ?30 to +30° to the occlusal plane. The initial tooth displacement and von Mises stress on the clear aligners were analyzed.
Results: All CAT-based total distalization groups showed an overall trend of clockwise or counterclockwise rotation of the occlusal plane as the force direction varied. Mesiodistal tipping of individual teeth was more prominent than that of bodily movements. The initial displacement pattern of the mandibular teeth was more predominant based on the traction site than on the traction method. The elastic deformation of clear aligners is attributed to unintentional lingual tipping or extrusion of the mandibular anterior teeth.
Conclusions: The initial tooth displacement can vary according to different distalization strategies for CAT-based total distalization. Discreet application and biomechanical understanding of traction sites and directions are necessary for appropriate mandibular total distalization.
키워드
Finite element method; Clear aligner; Distalization
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