title: A comparative analysis of restorative materials used in abfraction lesions in tooth with and without occlusal restoration: Three-dimensional finite element analysis.
abstract: OBJECTIVE
  The present comparative analysis aimed at evaluating the mechanical behavior of various restorative materials in abfraction lesion in the presence and absence of occlusal restoration.
  
  
  METHODS
  A three-dimensional finite-element analysis was performed. Six experimental models of mandibular first premolar were generated and divided into two groups (groups A and B) of three each. All the groups had cervical abfraction lesion restored with materials and in addition group A had class I occlusal restoration. A load of 90 N, 200 N, and 400 N were applied at 45° loading angle on the buccal inclines of buccal cusp and Von Mises stresses was chosen for analysis.
  
  
  RESULTS
  In all the models, the values of stress recorded at the cervical margin of the restorations were at their maxima. Irrespective of the occlusal restoration, all the materials performed well at 90 N and 200 N. At 400 N, only low-shrink composite showed stresses lesser than its tensile strength indicating its success even at higher load.
  
  
  CONCLUSIONS
  Irrespective of occlusal restoration, restorative materials with low modulus of elasticity are successful in abfraction lesions at moderate tensile stresses; whereas materials with higher modulus of elasticity and mechanical properties can support higher loads and resist wear.
  
  
  CONCLUSIONS
  The model allows comparison of different restorative materials for restoration of abfraction lesions in the presence and absence of occlusal restoration. The model can be used to validate more sophisticated computational models as well as to conduct various optimization studies.
authors.affiliation: Department of Conservative Dentistry and Endodontics, The Oxford Dental College, Hospital and Research Centre, Bangalore, Karnataka, India.
authors.forename: A
authors.initials: A
authors.lastname: Srirekha
authors.forename: Kusum
authors.initials: K
authors.lastname: Bashetty
keywords: Abfraction lesion; finite-element analysis; low-shrink composite; nano-filled restorative materials; resin-modified glass-ionomer; stress distribution