title: 3D-fEA of stress levels and distributions for different bases under a Class I composite restoration.
abstract: OBJECTIVE
  To investigate the level and distribution of stresses in composite-restored mandibular first molars with various combinations of base materials.
  
  
  METHODS
  The finite element package Abaqus was used for the stress analysis. Several different base materials were evaluated [light-cured glass ionomer (LC-GI), chemically-cured calcium hydroxide (CC-CH), and light-cured calcium hydroxide (LC-CH)] in combination with light-cured composite (LC-CP). Four models of restored molars with Class I deep cavity preparations were simulated, including (1) LC-GI/LC-CP, (2) CC-CH/LC-CP, (3) CC-CH/LC-GI/LC-CP, and (4) LC-CH/LC-GI/LC-CP. A 250N static single-point load was applied vertically on the central fossa of the tooth to simulate physical loading conditions.
  
  
  RESULTS
  In each case, the peak stresses were found to be concentrated mainly at the interfaces between the various materials and the dental tissues. In the residual tooth structures, the maximum Von Mises stresses were 20.01 MPa in model LC-GI/LC-CP, 23.85 MPa in model CC-CH/LC-CP, 23 MPa in model CC-CH/LC-GILC-CP and 21.83 MPa in model LC-CH/LC-GIILC-CP. In the LC-CP restorations, the maximum Von Mises stresses were 43.68 MPa in model LC-GILC-CP, 42.24 MPa in model CC-CH/LC-CP, 42.29 MPa in model CC-CH/LC-G/LC-CP and 42.55 MPa in model LC-CH/LC-GI/LC-CP. In the bases, the maximum Von Mises stresses were 5.71 MPa in model LC-GI/LC-CP, 0.85 MPa in model CC-CH/LC-CP, 4.69 MPa in model CC-CH/LC-GI/LC-CP, and 4.93 MPa in model LC-CH/LC-GILC-CP.
authors.affiliation: State Key Laboratory of Oral Diseases, Department of Orthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhengyu
authors.initials: Z
authors.lastname: Liao
authors.forename: Dan
authors.initials: D
authors.lastname: Liu
authors.forename: Zhan
authors.initials: Z
authors.lastname: Liu
authors.forename: Grant T
authors.initials: GT
authors.lastname: McIntyre
authors.forename: Fan
authors.initials: F
authors.lastname: Jian
authors.forename: Wei
authors.initials: W
authors.lastname: Lv
authors.forename: Jinbo
authors.initials: J
authors.lastname: Yang
authors.forename: Zhihe
authors.initials: Z
authors.lastname: Zhao
authors.forename: Wenli
authors.initials: W
authors.lastname: Lai
mesh_terms: D002126:Calcium Hydroxide; D003188:Composite Resins; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis / Q000379:methods; D055119:Elastic Modulus; D020342:Finite Element Analysis; D005899:Glass Ionomer Cements; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008953:Models, Anatomic; D003765:Models, Dental; D008963:Molar
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; D002126:Calcium Hydroxide