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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effect of mechanical cycling on the flexural strength of densely sintered ceramics.

OBJECTIVES: The aim of this study was to evaluate the effect of mechanical cycling on the biaxial flexural strength of two densely sintered ceramic materials. METHODS: Disc shaped zirconia (In-Ceram Zirconia) and high alumina (Procera AllCeram) ceramic specimens (diameter: 15mm and thickness: 1.2mm) were fabricated according to the manufacturers' instructions. The specimens from each ceramic material (N=40, n=10/per group) were tested for flexural strength either with or without being subjected to mechanical cycling (20,000cycles under 50N load, immersion in distilled water at 37 degrees C) in a universal testing machine (1mm/min). Data were statistically analyzed using two-way ANOVA and Tukey's test (alpha=0.05). RESULTS: High alumina ceramic specimens revealed significantly higher flexural strength values without and with mechanical cycling (647+/-48 and 630+/-43MPa, respectively) than those of zirconia ceramic (497+/-35 and 458+/-53MPa, respectively) (p<0.05). Mechanical cycling for 20,000 times under 50N decreased the flexural strength values for both high alumina and zirconia ceramic but it was not statistically significant (p>0.05). SIGNIFICANCE: High alumina ceramic revealed significantly higher mean flexural strength values than that of zirconia ceramic tested in this study either with or without mechanical cycling conditions.[1]


  1. Effect of mechanical cycling on the flexural strength of densely sintered ceramics. Itinoche, K.M., Ozcan, M., Bottino, M.A., Oyafuso, D. Dental materials : official publication of the Academy of Dental Materials. (2006) [Pubmed]
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