title: [Three-dimensional stress analysis of periodontal ligament of mandible incisors fixed bridge abutments under dynamic loads by finite element method].
abstract: OBJECTIVE
  Three-dimensional finite method was used to analyze stress and strain distributions of periodontal ligament of abutments under dynamic loads.
  
  
  METHODS
  Finite element analysis was performed on the model under dynamic loads with vertical and oblique directions. The stress and strain distributions and stress-time curves were analyzed to study the biomechanical behavior of periodontal ligament of abutments.
  
  
  RESULTS
  The stress and strain distributions of periodontal ligament under dynamic load were same with the static load. But the maximum stress and strain decreased apparently. The rate of change was between 60%-75%. The periodontal ligament had time-dependent mechanical behaviors. Some level of residual stress in periodontal ligament was left after one mastication period. The stress-free time under oblique load was shorter than that of vertical load.
  
  
  CONCLUSIONS
  The maximum stress and strain decrease apparently under dynamic loads. The periodontal ligament has time-dependent mechanical behaviors during one mastication. There is some level of residual stress left after one mastication period. The level of residual stress is related to the magnitude and the direction of loads. The direction of applied loads is one important factor that affected the stress distribution and accumulation and release of abutment periodontal ligament.
authors.affiliation: Dept of Prosthetics, Guanghua Graduate School of Stomatology, Sun Yat-Sen University, Guangzhou 510060, China.
authors.forename: Da
authors.initials: D
authors.lastname: Ma
authors.forename: Liang
authors.initials: L
authors.lastname: Tang
authors.forename: Yan-Huan
authors.initials: YH
authors.lastname: Pan
mesh_terms: D003830:Denture, Partial, Fixed; D020342:Finite Element Analysis; D006801:Humans; D007180:Incisor; D008334:Mandible; D008409:Mastication; D010513:Periodontal Ligament; D014070:Tooth