Mechanical and thermal properties of hot pressed CoCrMo–porcelain composites developed for prosthetic dentistry

In this study, mechanical and thermal properties of CoCrMo–porcelain composites for dental restorations have been evaluated. These metal–ceramic composites were produced by powder metallurgy and hot pressing techniques from the mixtures of metal and ceramic powders with different volume fractions. Y...

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Bibliographic Details
Published in:Journal of the mechanical behavior of biomedical materials 2014-02, Vol.30, p.103-110
Main Authors: Henriques, B., Gasik, M., Souza, J.C.M., Nascimento, R.M., Soares, D., Silva, F.S.
Format: Article
Language:English
Subjects:
CoCrMo alloy
Composite
Dental materials
Dental Porcelain - chemistry
Dental Prosthesis
Dentistry
Elastic Modulus
Hot Temperature
Materials Testing
Mechanical Phenomena
Mechanical properties
Porcelain
Powder metallurgy
Restoration
Scanning electron microscopy
Shear
Shear Strength
Surface Properties
Thermal expansion
Thermal properties
Vitallium - chemistry
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Summary:In this study, mechanical and thermal properties of CoCrMo–porcelain composites for dental restorations have been evaluated. These metal–ceramic composites were produced by powder metallurgy and hot pressing techniques from the mixtures of metal and ceramic powders with different volume fractions. Young's moduli and the coefficient of thermal expansion of materials were evaluated by dynamic mechanical analysis (DMA) and dilatometry (DIL) tests, respectively. The strength in flexion and shear was measured with a universal test machine and hardness with a respective tester. The microstructures and fracture surfaces were inspected by the means of optical microscopy and Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS). Shear strength, Flexural strength and Young' moduli of ceramic and metal-matrix composites were found to increase with higher metal particles content. The DMA tests performed at different frequencies showed no frequency-dependent features of the materials studied, indicating no viscoelastic behavior. The fracture surfaces analysis suggests the load-transfer mechanism be possibly responsible for this behavior, as the differences in CTE are low enough to cause significant thermal stresses in these materials. The results might be included in a materials properties database for further use for design and optimization of dental restorations.
ISSN:1751-6161
1878-0180
DOI:10.1016/j.jmbbm.2013.10.023