Restoration of maxillary premolars: a finite element analysis of three repair methods and four kinds of dental restoration materials

doi:10.3969/j.issn.2095-4344.0059

Abstract

Abstract:

BACKGROUND: Prognosis in tooth restoration is affected by different repair methods due to the different biomechanical effects.

OBJECTIVE: To analyze three kinds of repair methods and four kinds of repair materials by using three-dimensional finite element analysis.

METHODS: Tomographic images of isolated human maxillary first premolars were obtained by Micro CT scanning with a thickness of 0.019 mm. The Mimics output point cloud was used to generate the surface in Geomagic studio and the tooth model was generated respectively. The model was introduced into ABAQUS 6.13 software for Boolean operation, to simulate Inlay, Onlay of the medullary cavity retention type, and Core & Crown repair model. After the grid was divided into four ways of mechanical loading, six-point vertical loading or two-point loading at an angle of 0^o, 45^o, 90^owith the long tooth shaft was done. The loading force was 75 N at each point. Four repair materials, cobalt-chrome, pure titanium, zirconia, IPS e.MAX, were used in this study.

RESULTS AND CONCLUSION: (1) Under the four loading conditions of the same material, the maximum principal stress in the remaining dentin after Inlay restoration was the highest, followed by the Onlay repair and Core＆Crown group. (2) Under the four loading conditions via the same approach, the maximum principal stress of the cobalt-chrome alloy in the enamel was the largest, and that of the IPS e.MAX porcelain was the smallest after repair. (3) The stress distribution of the parts was uniform after tooth restoration with the Core & Crown and the Onlay. To conclude, from the stress distribution, the Core＆Crown and the Onlay are two ideal methods. Moreover, from the aspects of stress distribution and dentin preservation, Onlay is a more rational and safer way for large-area tooth defects.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Inlays, Chromium Alloys, Finite Element Analysis, Tissue Engineering

CLC Number:

R318

Fu Hong-yu, Feng Guang-zhi. Restoration of maxillary premolars: a finite element analysis of three repair methods and four kinds of dental restoration materials[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(6): 858-864.

Figures/Tables 7

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