Relationship between fracture toughness and flexural strength in dental porcelains

✍ Scribed by 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
• Year: 2006
• Tongue: English
• Weight: 289 KB
• Volume: 78B
• Category: Article
• ISSN: 1552-4973
• DOI: 10.1002/jbm.b.30482

✦ Synopsis

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 modulus increased with the increase in K~Ic~, especially for values greater than 0.80 MPa m^1/2^. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2006