Performance of 3Y-TZP bioceramics under cyclic fatigue loading

Souza, Renato Chaves; Santos, Claudinei dos; Barboza, M.J.R.; Baptista, Carlos Antônio Reis Pereira; Strecker, Kurt; Elias, Carlos Nelson

doi:10.1590/s1516-14392008000100017

Cited by 17 publications

(3 citation statements)

References 16 publications

(14 reference statements)

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“…In particular, when a crack is deflected, the surface of the crack increases, leading to more energy required for crack propagation and an increase of fracture toughness [221,223]. The prediction of a crack path as the crack approaches a fiber can be based on an energy criterion or a stress criterion [217,219,220,[224][225][226][227]]. Young's modulus mismatches are also reported as mechanisms of crack deflection [211].…”

Section: Crack Deflectionmentioning

confidence: 99%

Toughening of Bioceramic Composites for Bone Regeneration

et al. 2021

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Bioceramics are widely considered as elective materials for the regeneration of bone tissue, due to their compositional mimicry with bone inorganic components. However, they are intrinsically brittle, which limits their capability to sustain multiple biomechanical loads, especially in the case of load-bearing bone districts. In the last decades, intense research has been dedicated to combining processes to enhance both the strength and toughness of bioceramics, leading to bioceramic composite scaffolds. This review summarizes the recent approaches to this purpose, particularly those addressed to limiting the propagation of cracks to prevent the sudden mechanical failure of bioceramic composites.

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Section: Crack Deflectionmentioning

confidence: 99%

Toughening of Bioceramic Composites for Bone Regeneration

et al. 2021

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“…O pequeno percentual da fase monoclínica era prevista [14], uma vez que o processo de sinterização ocorre acima da temperatura de transformação da fase tetragonal para monoclínica (aproximadamente 1170 ºC). Durante o resfriamento, devido ao acréscimo de 3% de óxido de ítria, a fase tetragonal se manteve está-vel até atingir a temperatura ambiente.…”

Section: Figura 1: Difratograma Dos Pós Tz-3y (G1) E Tz-3y-fe (G5)unclassified

Efeito da adição de Fe2O3 nas propriedades da zircônia estabilizada com ítria

2017

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RESUMOO óxido de zircônio (ZrO 2 ) policristalino parcialmente estabilizado com 3%mol de óxido de ítrio (Y 2 O 3 ), ou 3Y-TZP, é usado como biomaterial nas restaurações protéticas odontológicas. Esta indicação possui limitação devido à coloração branca e alta opacidade da zircônia. Para melhorar a estética sem comprometer o desempenho funcional são adicionados outros óxidos à zircônia. Esta adição modifica a coloração da zircônia para tonalidades próximas a dos dentes naturais. Este trabalho avaliou o efeito da adição do Fe 2 O 3 na microestrutura, nas propriedades mecânicas e nas propriedades ópticas da 3Y-TZP. Foram preparados cinco grupos de amostras com diferentes percentuais de Fe 2 O 3 . A caracterização química dos grupos foi realizada por fluorescência de raios-X (FRX). As propriedades mecânicas foram determinadas em ensaios de dureza e de resistência a flexão em quatro pontos. A análise quantitativa de transformação de fases foi realizada pelo método de Rietveld dos dados dos ensaios de difração de raios-X (DRX). O MEV foi usado para caracterizar a morfologia da superfície antes e após o ensaio de flexão. Os resultados mostraram que a adição do Fe 2 O 3 influencia na transformação de fase, aumenta a dureza e a resistência à fratura por flexão quando sua concentração se encontra entre 0,02% e 0,17% do peso total. Acima dessa faixa de concentração, as amostras apresentaram perdas no desempenho mecânico. A adição de Fe 2 O 3 não induziu mudanças significativas na densidade e no tamanho médio de grão.Palavras-chave: Zircônia; óxido de ferro; biomateriais. ABSTRACTThe zirconium oxide (ZrO 2 ) polycristaline partially stabilized by yttrium oxide (Y 2 O 3 ) at 3mol%, 3Y-TZP, has its use been increased as a biomaterial. However, as dental prosthetics, its indication is still limited because of its white color and high opacity. Seeking improvements regarding aesthetics without compromising its functional performance, oxides such as iron oxide (Fe 2 O 3 ) has been added to the microstructure of zirconia in order to provide a yellow-brownish color similar to natural teeth. This study evaluated the effect of adding Fe 2 O 3 on the microstructure and mechanical and optical properties of 3Y-TZP. Five groups were investigated containing different concentrations of Fe 2 O 3 . Firstly, a chemical characterization of each group was carried out through X-ray fluorescence test (XRF). Microstructural characterization was performed by density and average grain size measurements. Mechanical properties were evaluated by performing hardness and four points flexural strength tests. Quantitative analysis of phase transformation was done using the Rietveld method, for each group submitted to the test of X-ray diffraction (XRD). Fractography by SEM analysis were also made on the fracture surface of the samples from tensile test. The results showed that the Fe 2 O 3 addition influenced the phase transformation process, and proportionally increased the samples hardness and flexural strength when their concentrations varied from 0.02%...

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“…Zirconium oxide, ZrO 2 , is a promising bioceramic due to its excellent biocompatibility, high fracture strength, fracture toughness, and low Young's modulus [1][2][3]. It is knowledge that ZrO 2 additions may increase the fracture toughness of compatible ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

Properties of Nanostructured 3Y-TZP Blocks Used for CAD/CAM Dental Restoration

Santos

Santos²,

Elias

2008

KEM

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Several CAD/CAM systems are available to dental prosthesis laboratories which can be used to fabricate all-ceramic copings and frameworks. The use of these systems presents low demand, due principally the high blocks ceramics cost used for theses systems. Usually, these ceramic blocks are sintered at high temperatures, between 1450 and 15500C, resulting in micrometric ZrO2 microstructure. A considerable innovation in these ceramics systems used in CAD/CAM applications was introduced by the use of nanometric-tetragonal ZrO2 blocks, which are sintered at low sintering temperatures resulting in nanometric grains morphology and improved mechanical properties. The purpose of the present work is to characterize the mechanical properties of nanoparticled zirconium oxide blocks comparing with commercial micrometric ceramic parts. XRD patterns showed that the blocks have only the tetragonal-ZrO2 as crystalline phase. The tetragonal-monoclinic transformation phase was responsible for the excellent mechanical properties. Nanometric blocks presented hardness of 13GPa, fracture toughness of 11MPam1/2 , bending strength of 1020MPa and Weibull modulus, m=14, while micrometric ZrO2 blocks similar hardness, fracture toughness 8.5MPam1/2, bending strength of 850MPa and Weibull modulus of 10.

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Performance of 3Y-TZP bioceramics under cyclic fatigue loading

Cited by 17 publications

References 16 publications

Toughening of Bioceramic Composites for Bone Regeneration

Toughening of Bioceramic Composites for Bone Regeneration

Efeito da adição de Fe2O3 nas propriedades da zircônia estabilizada com ítria

Properties of Nanostructured 3Y-TZP Blocks Used for CAD/CAM Dental Restoration

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