Relationship between fracture toughness and flexural strength in dental porcelains.
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 (sigma(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, sigma(0) increased with the increase of K(Ic) until approximately 0.75 MPa m(1/2). After that, the increase in K(Ic) was accompanied by a decrease in sigma(0). However, the Weibull modulus increased with the increase in K(Ic), especially for values greater than 0.80 MPa m(1/2).
Department of Dental Materials, School of Dentistry, University of São Paulo, São Paulo, Brazil.
Paulo Francisco
PF
Cesar
Humberto Naoyuki
HN
Yoshimura
Walter Gomes
WG
Miranda
Caroline Lumi
CL
Miyazaki
Luciana Mayumi
LM
Muta
Leondardo Eloy
LE
Rodrigues Filho
D000538:Aluminum Silicates; D019245:Compressive Strength; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D006244:Hardness; D008422:Materials Testing; D018583:Pliability; D013499:Surface Properties
D000538:Aluminum Silicates; D003776:Dental Porcelain; C078519:leucite