Chinese Journal of Tissue Engineering Research ›› 2016, Vol. 20 ›› Issue (12): 1806-1811.doi: 10.3969/j.issn.2095-4344.2016.12.020

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Finite element analysis of maxillary central incisor all-ceramic crowns in different occlusal states

Xiao Yan1, Xiong Kang2, Quan Fei-fei3   

  1. 1Medical School of Hubei Polytechnic institute, Xiaogan 432100, Hubei Province, China; 2Department of Stomatology, Second Affiliated Hospital of Jianghan University, Wuhan 430050, Hubei Province, China; 3Department of Endodontics, Xiaogan Stomatological Hospital, Xiaogan 432000, Hubei Province, China
  • Received:2015-12-30 Online:2016-03-18 Published:2016-03-18
  • About author:Xiao Yan, Master, Lecturer, Medical School of Hubei Polytechnic institute, Xiaogan 432100, Hubei Province, China

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Abstract:

BACKGROUND: The strength of all-ceramic crowns is affected by many factors. At present there are many studies concerning the neck edge shape, cutting thickness, binder and convergence angle, but little has been reported on the effects of different occlusions on all-ceramic crowns. OBJECTIVE: To explore the maxillary central incisor all-ceramic crowns in different occlusal states by finite element analysis.
METHODS: Three-dimensional finite element models of the maxillary central incisor all-ceramic crowns were established. Empress II and In-Ceram Zirconia were selected. The normal overbite position and deep overbite position were applied to force a load of 230 N, with the long axis of the tooth at a 45° angle. Distribution of inner stress and edge stress was analyzed at different occlusal states.
RESULTS AND CONCLUSION: (1) The stress distribution of all-ceramic crowns under different occlusion relationship was different. The stress peaks of cementum, alveolar bone and periodontium in the deep overbite were lower than those in the normal overbite. The stress peaks of all-ceramic crowns and binder were higher than in the deep overbite than the normal overbite. The stress peak of the dentin in the Empress II group was higher in the deep overbite than in the normal overbite. The stress peak of the dentin in the In-Ceram Zirconia group was lower in the deep overbite than in the normal overbite. Different all-ceramic crowns had no influence on the stress distribution, but in the deep overbite, the stress was mainly concentrated in the occlusal contact area, and in the normal overbite, the stress was mainly concentrated in the occlusal contact area and at the labial cervical margin. (2) The stress distribution of different all-ceramic crowns under the same occlusal state was different. In the normal overbite, different all-ceramic crowns had no evident influence on the stress peak, and in the deep overbite, there was a certain effect of different all-ceramic crowns on the stress peak, but there was no significant difference. The stress peaks of blinder and dentin were obviously affected by all-ceramic crowns. The stress peaks of blinder and dentin in Empress II group were higher than those in the In-Ceram Zirconia group.