| Objective: The purpose of this study was to analysis the stress distribution in all-ceramic dental crown of the first premolar of maxillary, and to study the influence of different inclination of cusp on all-ceramic dental crowns' fracturing load, which can provides biomechanics basis for its clinical practice design.Methods: A standard first premolar of maxillary was selected and was scanned with spiral CT, the data in DICOM format generated by the CT was used directly to construct three-dimensional finite element models of different inclination of cusp designed prosthetic systems. A finite element analysis software MSC.Marc was used to study the stress distributions of the prosthetic systems and the fracturing load of the all-ceramic dental crowns when simulate load was applied at different points of the occlusal surface in two directions.Result: In any loading conditions, stress concentrates on the area of the loading point in the all-ceramic crowns. Stress distribution in the prosthetic systems changed with the changing of loading conditions. The fracturing load of the all-ceramic dental crowns were significantly different with the different inclination of cusp design when the loading was applied at the same point of the occlusal surface in the same direction, it declined with the increasing of the inclination of cusp design. The loading directions and the loading points influenced the fracturing load of the all-ceramic dental crowns either.Conclusions:1. The finite element method is a convenient and effective way in oral... |
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