Correlation between fracture toughness and leucite content in dental porcelains

César, Paulo Francisco; Yoshimura, Humberto Naoyuki; Júnior, Walter Gomes Miranda; Okada, Cristina Yuri

doi:10.1016/j.jdent.2005.02.001

Cited by 83 publications

(72 citation statements)

References 19 publications

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“…Dental ceramics are brittle materials that fracture into two or more pieces when they are submitted to tensile forces 23 . Thus, determination of fracture toughness of these materials is important to predict the clinical performance once measures the ability of a material to withstand crack propagation 7,19 .…”

Section: Discussionmentioning

confidence: 99%

“…According to some authors, high leucite content, particle size and homogeneous particle distribution can improve ceramic strength 6 . Then, high fracture toughness of EMP can be attributed to its leucite content (35%), once there is a positive correlation between leucite content and fracture toughness because leucite increases the resistance to crack propagation 19,26 . Additionally, fracture toughness increases with greater particle size 6 , corroborating the results of the present study where greater crystals (5 to 10 micrometer) are present in EMP.…”

Section: Discussionmentioning

confidence: 99%

“…Thermal mismatch, chemical stress and mechanical process such as cyclic loading can lead to crack initiation at surface, and these microscopic cracks propagate trough bulk of the restorations, leading to catastrophic failures [17][18] . Then, fracture toughness permits to predict the clinical performance (fracture and wear) of ceramic materials describing the ability of the material to withstand crack propagation 7,19 .…”

Section: Introductionmentioning

confidence: 99%

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Fracture toughness of three heat pressed ceramic systems

et al. 2018

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Aim: The aim of this study was to evaluate fracture toughness by indentation method of three dental ceramics processed by heat pressing. The ceramics evaluated were fluorapatite glass ceramic (ZIR), glass ceramic containing leucite (POM) and leucite-reinforced glass ceramic (EMP). Materials and methods: Ninety disks (13mm of diameter x 4mm of thickness) and nine rectangular specimens (25x4x2mm) were made to evaluate, respectively, microhardness/fracture toughness (n=30) and elastic modulus (n=3). Samples were obtained by pressing ceramic into refractory molds. After polishing, Vickers microhardness was evaluated under 4,904N load for 20s. Elastic modulus was measured by impulse excitation technique. Data from microhardness and elastic modulus were used to calculate fracture toughness, after measuring crack length under 19,6N load applied for 20s. Results were evaluated by ANOVA and Tukey´s test. Results: Microhardness (VHN) of POM (637.9±53.6) was statistically greater (p<0.05) than ZIR (593.0±14. The results suggest that fluorapatite glass ceramic (ZIR) and leucite-reinforced glass ceramic (EMP) processed by heat pressing presented greater fracture toughness, improving clinical prognosis of metal free restorations.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fracture toughness of three heat pressed ceramic systems

et al. 2018

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“…The CTE of leucite is approximately 12.5-44×10 -6 /ºC 20) , which is similar to that of cristobalite. It has been reported that the flexural strength and fracture toughness of porcelains containing leucite were improved [4][5][6]21) . The linear dimensional change of leucite is relatively constant during heating 20) ; on the other hand, that of cristobalite is relatively stable except for a rapid expansion at 250 ºC due to crystalline transition 22) .…”

Section: Discussionmentioning

confidence: 99%

Effect of Polymorphism of SiO2 Addition on Mechanical Properties of Feldspathic Porcelains

et al. 2008

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The present study aimed to investigate the effects of SiO2 polymorphism on the mechanical properties of feldspathic porcelains. Seven kinds of experimental feldspathic porcelains were prepared using chemical reagents; three types of low-fusing feldspathic glasses and four types of two-phase porcelains by adding 10 or 20 mass% of fused silica (T-F) or cristobalite (T-C). Flexural strength and fracture toughness of these porcelains were evaluated. Flexural strengths of two-phase porcelains did not show any significant increase when compared with those of single-phase glasses. On the other hand, fracture toughnesses of porcelains with cristobalite showed a significant increase when compared with those of single-phase glasses. Circumferential cracks were observed in the porcelains with cristobalite. These results suggested that cristobalite could strengthen fracture toughness of feldspathic porcelains, but not flexural strength.

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“…Cesar et al (2005) reportaram aumento significativo nos valores de tenacidade à fratura para porcelanas com conteúdo de leucita superior a 15%. O material com conteúdo de leucita semelhante ao encontrado no presente estudo, ao redor de 6%, apresentou Della Bona et al, 2003;Guazzato et al, 2004c;White et al, 2005).…”

Section: Comportamento De Crescimento Subcrítico De Trincas -Scgunclassified

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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Correlation between fracture toughness and leucite content in dental porcelains

Cited by 83 publications

References 19 publications

Fracture toughness of three heat pressed ceramic systems

Fracture toughness of three heat pressed ceramic systems

Effect of Polymorphism of SiO2 Addition on Mechanical Properties of Feldspathic Porcelains

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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