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Stress intensity factor threshold in dental porcelains

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Abstract

The stress intensity factor threshold (KI0) is related to the stress level at which cracks start to grow stably, causing the weakening of porcelain prostheses during their use. The values of KI0 of seven dental porcelains (with and without reinforcing leucite crystal, KAlSi2O6) stored in air (22 °C, 60% relative humidity) and artificial saliva (37 °C) were determined by measuring the crack growth velocity of radial cracks generated at the corner of Vickers indentations. The results of KI0 were correlated with the leucite content, fracture toughness (KIc), and chemical composition of the porcelains. It was observed that KI0 increased with the increase of leucite content (only for the leucite-based porcelains) and with the increase of KIc. The increase in Al2O3 content or the decrease in the alkali oxide (K2O and Na2O) content of the material’s glassy matrix tended to increase the KI0 values. Storage media (air and saliva) did not significantly affect the KI0 of porcelains tested, indicating that the control parameter of KI0 value was not the water content of the storage media.

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Acknowledgments

The authors acknowledge the Brazilian agencies FAPESP and CNPq for the financial support of the present research.

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Authors and Affiliations

  1. Laboratory of Metallurgy and Ceramic Materials, Institute for Technological Research of the State of São Paulo, Sao Paulo, Brazil

    Humberto Naoyuki Yoshimura

  2. Deparment of Dental Materials, School of Dentistry, University of São Paulo, Sao Paulo, SP, CEP 05508-900, Brazil

    Paulo Francisco Cesar, Fabiana Naomi Soki & Carla Castiglia Gonzaga

  3. Departamento de Materiais Dentários–Faculdade de Odontologia, Universidade de São Paulo, Av. Prof. Lineu Prestes, 2227–Cidade Universitária “Armando Salles de Oliveira”, Sao Paulo, SP, CEP 05508-900, Brazil

    Paulo Francisco Cesar

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  1. Humberto Naoyuki Yoshimura
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  2. Paulo Francisco Cesar
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  3. Fabiana Naomi Soki
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  4. Carla Castiglia Gonzaga
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Correspondence to Paulo Francisco Cesar.

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Yoshimura, H.N., Cesar, P.F., Soki, F.N. et al. Stress intensity factor threshold in dental porcelains. J Mater Sci: Mater Med 19, 1945–1951 (2008). https://doi.org/10.1007/s10856-007-3290-4

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  • DOI: https://doi.org/10.1007/s10856-007-3290-4

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