• 临床研究 •

### “2×4”矫治系统中前倾弯弓丝弯折位置变化对其力学行为影响的三维有限元分析

1. 吉林大学口腔医院正畸科, 吉林 长春 130021
• 收稿日期:2018-04-08 出版日期:2018-11-28 发布日期:2018-11-28
• 通讯作者: 胡敏,教授,博士研究生导师(Tel:0431-85579371,E-mail:humin@jlu.edu.cn) E-mail:humin@jlu.edu.cn
• 作者简介:贾一凡(1992-),男,河南省濮阳市人,在读医学硕士,主要从事口腔正畸生物力学和临床治疗方面的研究。
• 基金资助:
国家自然科学基金资助课题（81470764，81600898）；吉林省教育厅科研项目资助课题（吉教科合字[2015]第531号）

### Effect of variation of bending location of tip-forward bending arch wires on its mechanical behavior in “2×4” appliance system: A three-dimensional finite element analysis

JIA Yifan, HU Min

1. Department of Orthodontics, Stomatology Hospital, Jilin University, Changchun 130021, China
• Received:2018-04-08 Online:2018-11-28 Published:2018-11-28

Abstract: Objective: To construct a three-dimensional finite element model of "2×4" appliance system simulating the clinical reality, and to investigate the effect of variation of bending location of tip-forward bending arch wires on the mechanical behavior in "2×4" appliance system.Methods: The 3-dimensional finite element model of "2×4" appliance system including maxillary dentition and brackets of tip-forward arch wires were constructed by reverse engineering method and the tip-forward bending arch wires with different bending locations[arch wire length from the point of arch wire to the central point of central incisor bracket/arch wire length from the central point of the buccal tube to the central point of central incisor bracket (A/L) were 0.8,0.7,0.6,0.5,0.4,and 0.3]were designed. The forces and moments of teeth under different tip-forward arch wires and the initial displacement of teeth under molar tip-forward arch wires were calculated by finite analysis software.Results: The force system changed as the bending locations of tip-forward arch wires varied. There were no vertical forces existed at A/L=0.41 for the first molar and incisors. There were no neutral points existed in the vertical force system(make the vertical forces=0 N in vertical direction). The moment of the first molar reversed when A/L=0.38 and the moment of lateral incisor reversed when A/L=0.59.The central incisor was affected under extrusion force without force and moment reverse as the bending location varied. The initial displacement of tooth was not conducive to the correction of anterior tooth apertognathia when A/L=0.8.Conclusion: The force system of three-dimensional finite element model of "2×4" appliance system changes as the varying of bending location of tip-forward arch wires. The molar tip-forward arch wire is unfavorable when correcting the anterior tooth apertognathia and the auxiliaries should be added.

• R783.5