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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Mechanical Properties of Zirconia Y-TZP Core Veneered for Dentistry Applications

C.N. Elias1, H.E.S. dos Santos1, M. Garbossa2, C. dos Santos3

1 Instituto Military de Engenharia, Materials Science Department, Pça Gen Tibúrcio, 80, Praia Vermelha, 22290 – 270 Rio de Janeiro, RJ – Brasil.
2 Universidade Veiga de Almeida, Rua Ibituruna, 108, 27271 – 901 Rio de janeiro, RJ – Brazil.
3 Universidade do Estado do Rio de Janeiro, 27537 – 803 Resende, RJ – Brazil.

received May 15, 2017, received in revised form September 4, 2017, accepted November 7, 2017

Vol. 8, No. 4, Pages 525-530   DOI: 10.4416/JCST2017-00032

Abstract

The objective of this work is to compare the mechanical properties of sintered yttria tetragonal zirconia polycrystalline (Y-TZP) micro- and nano-particles, and evaluate the influence of a layer of veneer aesthetic ceramic (annealing from 600 °C to 935 °C, surface finishing) on Y-TZP mechanical properties. The specimens were cut from four Y-TZP pre-sintered blocks, sintered, polished and coated with feldspathic ceramic. One experimental Y-TZP block was made with Y-TZP nano-particles and three commercially available blocks were made with Y-TZP micro-particles from different companies (ProtMat, Ivoclar and Vita). One group of ProtMat Y-TZP micro-particles specimens was not coated. The zirconia with nano-particles showed the highest flexural strength (1020 MPa) and fracture toughness (11.2 MPa·m-1/2). ANOVA statistical analysis did not show statistically a difference in the flexural strength (∼ 850 MPa), hardness (∼ 1300 HV), fracture toughness (∼ 9 MPa·m-1/2) and shear strength (∼ 12.97 MPa) among the zirconia specimens with micrometer-sized particles.

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Keywords

Y-TZP, zirconia nano-particles, dental prosthesis, zirconia core veneered

References

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