Finite element analysis of orthodontic bracket tie wing deformation due to labial crown torque

[摘要] To measure the tie wing deformation of conventional orthodontic bracket during applied archwire torque using finite element analysis (FEA). Maxillary (upper) right central incisor stainless steel (SS) conventional orthodontic bracket dimensions were obtained using profile projector. A three-dimension model of the bracket was done. A finite element (FE) model of the bracket was constructed. A SS archwire applied torque was obtained theoretically for the angles of twist from 5° to 40°. Rectangular archwire labial crown torque was applied as a couple in two positions into the bracket slot. Further, the SS bracket profile was considered as ceramic to study the effect of materials. The FE results showed that there was increased bracket tie wing deformation with increasing torque in both the materials. The tie wing deformation varies from 0.24 μm to 12.4 μm and 0.153 μm to 6.65 μm for SS and ceramic respectively. The deformation of occlusal side tie wings was more than the gingival side tie wings. Tie wing deformation leads to the loss of applied torque and might delay the tooth movement. This insilico study visualizes the orthodontic bracket tie wing deformation to clinicians.

[发布机构] Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram; Tamilnadu; 603203, India^1;Teeth N Jaws Center, Lake Area, Nungambakkam, Chennai; Tamilnadu; 600034, India^2;Alumnus, Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram; Tamilnadu; 603203, India^3

[关键词] Archwires;Ceramic bracket;In-silico;Orthodontic brackets;Three dimension modeling;Tooth movement;Wing deformation