Three-dimensional finite element analysis of the biomechanical effects of different traction hook heights on dis-tal movement of maxillary canines
LI Yi-ning
PENG You-jian
SHE Wen-ting
LI Ruo-han
Abstract：Objective To investigate the biomechanical properties of maxillary canines during distal displacement un-der different traction hook heights through three-dimensional finite element analysis,with the aim of determining the op-timal traction hook height and exploring its relationship with the impedance center position.Methods Construct a three-dimensional finite element model of maxillary dentition-periodontal ligament-alveolar bone,including the peri-odontal ligament,tooth,alveolar bone and archwire,and divide it into linear and nonlinear groups based on whether the periodontal ligament in the model is assumed to be a homogeneous and isotropic linear elastic body.Set the height of the traction hook to 6 working conditions of 1 mm,4 mm,7 mm,8 mm,9 mm and 10 mm.Apply a 1.47 N traction force to-wards the far center and towards the first molar at the hook end(i.e.loading point)of the traction hook.Analyze the equiv-alent stress,maximum compressive stress,maximum tensile stress,and maximum principal stress values of the periodon-tal ligament on the inner and outer sides of the tooth under the 6 working conditions of linear and nonlinear groups,and the movement of the canine teeth was also analyzed.Results In the six working conditions of this study,when the height of the traction hook was 8 mm,the absolute values of the equivalent stress,maximum tensile stress,and maximum compressive stress of the periodontal membrane of the maxillary canines in the linear and nonlinear groups were the smallest,and a good stress area with the maximum range appeared on the far and middle surfaces,without any dangerous stress areas.As the height of the traction hook increased,the linear and nonlinear tooth roots gradually moved from mesi-al to distal,and the dental crown gradually moved from distal to mesial.When the height of the traction hook was 8 mm,both the tooth root and crown moved distally,and the displacement was similar(＜1 mm).In addition,the 8 mm-high traction hook was closer to the impedance center.Conclusion Among the six working conditions in this study,the traction hook closer to the impedance center(with a height of 8 mm)is more capable of controlling the root displacement of maxillary canines,and effectively reduces the risk of root resorption.
Keywords：maxillary caninetraction hookorthodontic forceorthodontic tooth movementfinite element analysis
Publication Date：2025-02-27
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 54-59 )