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Relationship Between Fracture Toughness and Flexural Strength in Dental Porcelains by Paulo Francisco Cesar; Humberto Naoyuki Yoshimura; Walter Gomes Miranda Jr.; Caroline Lumi Miyazaki; Luciana Mayumi Muta; Leondardo Eloy Rodrigues Filho is a Medicine article available to read on EtoBox.

## Abstract The aim of this study was to investigate the correlation between fracture toughness (__K__~Ic~) and flexural strength (FS) in dental porcelains. Porcelains with different leucite contents and clinical indications were used (A, B, C, D, and E). __K__~Ic~ was determined by surface crack in flexure method (SCF) and FS was determined by four‐point‐bending test. Microstructural characterization was also carried out. The leucite contents of porcelains A, B, C, D, and E were, respectively, 22, 22, 6, 15, and 0%. Materials with higher leucite content (A and B) presented significantly higher __K__~Ic~ values compared to materials with lower leucite content (C and E). The Weibull moduli (__m__) of porcelains A and B were statistically higher than those of the other three materials. Regarding characteristic strength (σ~0~), porcelains D and E showed similar values and statistically higher than those of the other materials which were statistically different from each other. According to the regression analysis, σ~0~ increased with the increase of __K__~Ic~ until ∼0.75 MPa m^1/2^. After that, the increase in __K__~Ic~ was accompanied by a decrease in σ~0~. However, the Weibull modul

Author

Paulo Francisco Cesar; Humberto Naoyuki Yoshimura; Walter Gomes Miranda Jr.; Caroline Lumi Miyazaki; Luciana Mayumi Muta; Leondardo Eloy Rodrigues Filho

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1552-4973)

Published

2006

Language

EN

Field

Medicine (Health Sciences)