title: [A three-dimensional finite element study of the temporomandibular joint with different curve of Spee].
abstract: OBJECTIVE
  To analyze the stress distribution in temporomandibular joint (TMJ) with different depth of curve of Spee (CS) by three-dimensional finite element model (3D-FEM).
  
  
  METHODS
  FEM with different depth of CS were established. The depth was 2.50, 0 and 4.50 mm (model 0, 1, 2). The stress distribution were analyzed by software Abaqus. The change of stress were analyzed by paried t test.
  
  
  RESULTS
  The stress distribution patterns in TMJ with different depth of CS were similar. The Von Mises on the anterior surface of condyle and the Von Mises on the intermedial zone of the disc was higher. The S. Max. Principal of the condyle was mainly tensile stress. The S. Min. Principal of the condyle was mainly compressive stress. The S. Max. Principal of the disc was mainly tensile stress. The S.Min. Principal of the disc was mainly compressive stress.In model 0, the eviations of the Von Mises, the S.Max. Principal and the S.Min. Principal on the anterior surface of condyle were 0.1057 - 0.2298 MPa, -0.2243 - -0.3738 MPa and -0.3494 - -0.1165 MPa. The eviations of the Von Mises, the S.Max. Principal and the S. Min. Principal on the intermedial zone of the disc were 0.1099 - 0.6880 MPa, -0.3217 - 0 MPa and -1.2000 - -0.1000 MPa. The D-values of of Von Mises of condyle and disk between different models were extremely significant (P < 0.01).
  
  
  CONCLUSIONS
  With the same plane of occlusion, the stress distribution patterns of TMJ with different depth of CS is similar to that of normal occlusion. The final results also validate the anterior surface of condyle and intermediate zone of articular disc are the weight-bearing areas in TMJ. The changes of depth of CS change the value of the stress.
authors.affiliation: Department of Prosthodontics, School of Stomatology, Jilin University, Changchun 130021, China.
authors.forename: Ying-ming
authors.initials: YM
authors.lastname: Wan
authors.forename: Ming
authors.initials: M
authors.lastname: Bi
authors.forename: Hui
authors.initials: H
authors.lastname: Han
authors.forename: Jing-yun
authors.initials: JY
authors.lastname: Wang
mesh_terms: D002508:Cephalometry; D003766:Dental Occlusion; D003799:Dental Stress Analysis / Q000379:methods; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008335:Mandibular Condyle / Q000502:physiology*; D013314:Stress, Mechanical; D013704:Temporomandibular Joint / Q000502:physiology*; D019224:Temporomandibular Joint Disc / Q000502:physiology*