title: Non-carious cervical lesions: influence of morphology and load type on biomechanical behaviour of maxillary incisors.
abstract: BACKGROUND
  The aim of this study was to measure the effect of simulating two different loads on maxillary incisors displaying eight morphological types of non-carious cervical lesions, unrestored and restored with an adhesive restoration, by quantifying the stress distributions generated using finite element analysis.
  
  
  METHODS
  Virtual models of maxillary incisors were generated using the CAD software (RhinoCeros). After composing virtual dental and supporting structures with and without non-carious cervical lesions, each model was meshed using a control mesh device (ANSYS Finite Element Analysis Software). All of the virtual models were subjected to two load types, oblique load and vertical load, to simulate occlusal forces of 100 N each. Comparisons were made between simulated teeth with non-carious cervical lesions, with and without composite resin restorations, and a simulated sound tooth. Data summarizing the stress distributions were obtained in MPa using von Mises criteria.
  
  
  RESULTS
  Oblique loading on simulated non-carious cervical lesions resulted in greater stress concentration compared with vertical loading, and non-carious cervical lesions with acute angles displayed higher stress concentrations at the depth of the lesion. Restoring the lesions with an adhesive restoration, such as composite resin, appeared to overcome this stress concentration.
  
  
  CONCLUSIONS
  Restoring NCCLs with adhesive restorative materials, such as a nanohybrid composite resin, appears to recover the biomechanical behaviour similar to sound teeth.
authors: Nucleus of Extension, Research and Teaching of NCCL, Operative Dentistry and Dental Materials Department, School of Dentistry, Federal University of Uberlandia, Brazil.
authors: P V
authors: PV
authors: Soares
authors: P C F
authors: PC
authors: Santos-Filho
authors: C J
authors: CJ
authors: Soares
authors: V L G
authors: VL
authors: Faria
authors: M F
authors: MF
authors: Naves
authors: J A
authors: JA
authors: Michael
authors: J A
authors: JA
authors: Kaidonis
authors: S
authors: S
authors: Ranjitkar
authors: G C
authors: GC
authors: Townsend
mesh_terms: D001696:Biomechanical Phenomena / Q000502:physiology; D001732:Bite Force; D003188:Composite Resins / Q000627:therapeutic use; D003764:Dental Materials / Q000627:therapeutic use; D003799:Dental Stress Analysis / Q000379:methods*; D020342:Finite Element Analysis; D006801:Humans; D007180:Incisor / Q000503:physiopathology*; D008437:Maxilla; D013718:Tensile Strength; D014072:Tooth Abrasion / Q000473:pathology / Q000503:physiopathology* / Q000628:therapy; D019237:Tooth Cervix
chemical_list: D003188:Composite Resins; D003764:Dental Materials
keywords: Biomechanical behaviour; composite resin; finite element analysis; non-carious cervical lesion; teeth