title: [The study of cyclic fatigue and lifetime for all-ceramic crown after cementation].
abstract: OBJECTIVE
  To study mechanical and cyclic fatigue behavior of IPS Empress2 under cyclic loading, and to establish guidelines for the use and design of all-ceramic crowns.
  
  
  METHODS
  A 3-D finit element method model of tooth and crown were established. The strength and lifetime of all-ceramic crowns under cyclic loading in centric occlusion were investigated using computational techniques of the Abaqus and MSC Fatigue software.
  
  
  RESULTS
  Most of the fatigue and fracture of all-ceramic crown occurred within the veneering material at cervical marginal of the crown. The number of loading cycles before failure occurred varied within specified limits 2,506,109-6,950,243. The lifetime of the crown decreased significantly as loading increased and decreased gradually as loading time increased as well.
  
  
  CONCLUSIONS
  The mechanical and fatigue behavior of ceramic materials and restorations need to be improved before clinical use in order to guarantee clinical long-term success of all-ceramic crown. properly in order to increase the longevity of all-ceramic crowns.
authors: Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China. xhthmj@fmmu.edu.cn
authors: Hai-tao
authors: HT
authors: Xin
authors: Wei-guo
authors: WG
authors: Guo
authors: Yu-long
authors: YL
authors: Li
mesh_terms: D003776:Dental Porcelain; D003830:Denture, Partial, Fixed; D020342:Finite Element Analysis; D008422:Materials Testing
chemical_list: D003776:Dental Porcelain