期刊
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
卷 59, 期 -, 页码 236-240出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmbbm.2015.11.037
关键词
Dental prosthesis; Zirconia/veneer bi-material joint; Interface crack; Fracture criteria; Modified maximum tangential; stress criterion
资金
- Zachry Department of Civil Engineering at Texas AM University
The veneering porcelain sintered on zirconia is widely used in dental prostheses, but repeated mechanical loadings may cause a fracture such as edge chipping or delamination. In order to predict the crack initiation angle and fracture toughness of zirconia/veneer bilayered components subjected to mixed mode loadings, the accuracy of a new and traditional fracture criteria are investigated. A modified maximum tangential stress criterion considering the effect of T-stress and critical distance theory is introduced, and compared to three traditional fracture criteria. Comparisons to the recently published fracture test data show that the traditional fracture criteria are not able to properly predict the fracture initiation conditions in zirconia/veneer bi-material joints. The modified maximum tangential stress criterion provides more accurate predictions of the experimental results than the traditional fracture criteria. (C) 2015 Elsevier Ltd. All rights reserved.
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