Evaluation of an experimental dental porcelain

The aim of this study was to evaluate fracture toughness, hardness, ceramic/metal bond strength and microstructure of experimental dental porcelain and compare it with commercial type. Specimens of specific dimensions were prepared. Fracture toughness was assessed by a three-point bending test. The...

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Bibliographic Details
Published in:Journal of the mechanical behavior of biomedical materials 2010-11, Vol.3 (8), p.610-618
Main Authors: Hamouda, Ibrahim M., El-Waseffy, Noha A., Hasan, Ahmed M., El-Falal, Abeer A.
Format: Article
Language:English
Subjects:
Bond strength
Bonding strength
Ceramic bonding
Ceramics
Dental materials
Dental porcelain
Dental Porcelain - chemistry
Failure
Fracture mechanics
Fracture toughness
Hardness
Materials Testing
Metals - chemistry
Microscopy, Electron, Scanning
Microstructure
Porcelain
Potassium aluminum silicates
Scanning electron microscopy
Shear Strength
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Summary:The aim of this study was to evaluate fracture toughness, hardness, ceramic/metal bond strength and microstructure of experimental dental porcelain and compare it with commercial type. Specimens of specific dimensions were prepared. Fracture toughness was assessed by a three-point bending test. The Vickers hardness was measured using a microhardness tester. The ceramometal bond strength was measured using a universal testing machine. The load was applied at the porcelain/metal interface via a chisel edged blade with a crosshead speed of 2.0 mm/min until fracture. The polished specimens of dental porcelain were chemically etched and the microstructure was analyzed with a scanning electron microscope. The results showed comparable fracture toughness and bond strength for both materials, while the experimental porcelain exhibited higher hardness. The experimental porcelain showed uniform cohesive failure while the commercial type showed mixed mode of failure. The microstructure of the experimental porcelain was tetragonal leucite crystals dispersed randomly in a glass matrix. The leucite crystals exist in two forms, acicular and rod like structures. It was concluded that the experimental porcelain has adequate fracture toughness and ceramic/metal bond strength that can resist the rapid crack propagation and its consequent catastrophic failure, which indicates a material serviceability in the oral cavity.
ISSN:1751-6161
1878-0180
DOI:10.1016/j.jmbbm.2010.07.011