title: [Establishment and biomechanical analysis of three-dimensional nonlinear finite element model of three-pieces segment arch].
abstract: OBJECTIVE
  To reconstruct a three-dimensional nonlinear finite element model of mandibular teeth with three-pieces segment arch, and analyze the mechanical properties of intrusive arch and the biomechanical characteristics of three-pieces segment arch.
  
  
  METHODS
  Three-dimensional nonlinear finite element model of mandible with three-pieces segment arch was reconstructed by multi-slice spiral CT scanning, Mimics, CATIA and Anasys software. Then, the mechanical properties of intrusive arch, the movement trend and stress distribution of three-pieces segment arch were calculated by Anasys software.
  
  
  RESULTS
  In the range of 5 degrees-25 degrees, with the degree of intrusive arch increased, the force of intrusive arch also increased rapidly. The maximal force was 0.604 8 N in 30 degrees; the force was about 0.59 N in 30 degrees-65 degrees range. In condition of three-pieces segment arch mechanics, lateral incisor tipped labially and intruded; the first moral tipped distally and rotating; other teeth did not move clearly. The largest stress distribution in the whole arch was in the one-third labial cervical area of the lateral incisor root and the root bifurcations of first moral.
  
  
  CONCLUSIONS
  Under an appropriate intrusive force, three-pieces segment arch can intrude incisors and control the extrusion of posterior teeth. It can be used to correct the deep overbite, especially with high mandibular planes, gummy smile or adult patients.
authors.affiliation: Dept. of Orthodontics, Suzhou Huaxia Stomatological Hospital Affiliated to Suzhou Health College, Suzhou 215000, China.
authors.forename: Shijun
authors.initials: S
authors.lastname: Lu
authors.forename: Zhendong
authors.initials: Z
authors.lastname: Wang
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Ni
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
mesh_terms: D003724:Dental Arch; D020342:Finite Element Analysis; D006801:Humans; D007180:Incisor; D008334:Mandible; D014092:Tooth Root