Development of ZTA (80% Al2O3/20% ZrO2) pre-sintered blocks for milling in CAD/CAM systems
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Journal of the Mechanical Behavior of Biomedical Materials
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The present work aims to develop a production method of pre-sintered zirconia-toughened-alumina (ZTA)
composite blocks for machining in a computer-aided design and computer-aided manufacturing (CAD-CAM)
system. The ZTA composite comprised of 80% Al2O3 and 20% ZrO2 was synthesized, uniaxially and isostatically
pressed to generate machinable CAD-CAM blocks. Fourteen green-body blocks were prepared and pre-sintered at
1000 ◦C. After cooling and holder gluing, a stereolithography (STL) file was designed and uploaded to manufacture disk-shaped specimens projected to comply with ISO 6872:2015. Seventy specimens were produced
through machining of the blocks, samples were sintered at 1600 ◦C and two-sided polished. Half of the samples
were subjected to accelerated autoclave hydrothermal aging (20h at 134 ◦C and 2.2 bar). Immediate and aged
samples were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Optical and
mechanical properties were assessed by reflectance tests and by biaxial flexural strength test, Vickers indentation
and fracture toughness, respectively. Samples produced by machining presented high density and smooth surfaces at SEM evaluation with few microstructural defects. XRD evaluation depicted characteristic peaks of alpha
alumina and tetragonal zirconia and autoclave aging had no effect on the crystalline spectra of the composite.
Optical and mechanical evaluations demonstrated a high masking ability for the composite and a characteristic
strength of 464 MPa and Weibull modulus of 17, with no significant alterations after aging. The milled composite
exhibited a hardness of 17.61 GPa and fracture toughness of 5.63 MPa m1/2, which remained unaltered after
aging. The synthesis of ZTA blocks for CAD-CAM was successful and allowed for the milling of disk-shaped
specimens using the grinding method of the CAD-CAM system. ZTA composite properties were unaffected by
hydrothermal autoclave aging and present a promising alternative for the manufacture of infrastructures of fixed
dental prostheses.
Como referenciar
LOPES, ADOLFO C.O.; BENALCAZAR-JALKH, ERNESTO B.; BERGAMO, EDMAARA T.P.; TIAGO, CAMPOS M.B.; CARVALHO, LAURA F. de; TANAKA, RICARDO; GENOVA, LUIS A.; YAMAGUCHI, SATOSHI; WITEK, LUKASZ; COELHO, PAULO G.; BONFANTE, ESTEVAM A. Development of ZTA (80% Al2O3/20% ZrO2) pre-sintered blocks for milling in CAD/CAM systems. Journal of the Mechanical Behavior of Biomedical Materials, v. 154, p. 1-9, 2024. DOI: 10.1016/j.jmbbm.2024.106533. Disponível em: https://repositorio.ipen.br/handle/123456789/48100. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.