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Subcritical crack growth in porcelains, glass-ceramics, and glass-infiltrated alumina composite for dental restorations

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Abstract

The objective was to compare fracture toughness (KIc), stress corrosion susceptibility coefficient (n), and stress intensity factor threshold for crack propagation (KI0) of two porcelains [VM7/Vita (V) and d.Sign/Ivoclar (D)], two glass-ceramics [Empress/Ivolcar (E1) and Empress2/Ivlocar (E2)] and a glass-infiltrated alumina composite [In-Ceram Alumina/Vita (IC)]. Disks were constructed according to each manufacturer’s processing method, and polished before induction of cracks by a Vickers indenter. Crack lengths were measured under optical microscopy at times between 0.1 and 100 h. Specimens were stored in artificial saliva at 37°C during the whole experiment. KIc and n were determined using indentation fracture method. KI0 was determined by plotting log crack velocity versus log KI. Microstructure characterization was carried out under SEM, EDS, X-ray diffraction and X-ray fluorescence. IC and E2 presented higher KIc and KI0 compared to E1, V, and D. IC presented the highest n value, followed by E2, D, E1, and V in a decreasing order. V and D presented similar KIc, but porcelain V showed higher KI0 and lower n compared to D. Microstructure features (volume fraction, size, aspect ratio of crystalline phases and chemical composition of glassy matrix) determined KIc. The increase of KIc value favored the increases of n and KI0.

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Acknowledgments

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

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Authors and Affiliations

  1. Department of Biomaterials and Oral Biochemistry, School of Dentistry, University of São Paulo, Sao Paulo, Brazil

    Carla Castiglia Gonzaga, Paulo Francisco Cesar & Walter Gomes Miranda Jr.

  2. School of Dentistry, Positivo University, Curitiba, Brazil

    Carla Castiglia Gonzaga

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

    Humberto Naoyuki Yoshimura

  4. 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. Carla Castiglia Gonzaga
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  2. Humberto Naoyuki Yoshimura
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  3. Paulo Francisco Cesar
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  4. Walter Gomes Miranda Jr.
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Correspondence to Paulo Francisco Cesar.

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Gonzaga, C.C., Yoshimura, H.N., Cesar, P.F. et al. Subcritical crack growth in porcelains, glass-ceramics, and glass-infiltrated alumina composite for dental restorations. J Mater Sci: Mater Med 20, 1017–1024 (2009). https://doi.org/10.1007/s10856-008-3667-z

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  • DOI: https://doi.org/10.1007/s10856-008-3667-z

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