Physical properties of conventional and monolithic yttria-zirconia materials after low-temperature degradation

Autor(es)

Poole, Stephanie Francoi ^[1] ; Pereira, Gabriel Kalil Rocha ^[2] ; Moris, Izabela C. M. ^[1] ; Marques, Artur Gaioto ^[1] ; Ribeiro, Ricardo Faria ^[3] ; Gomes, Erica A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Ribeirao Preto, Sch Dent, Ribeirao Preto UNAERP, Ribeirao Preto, SP - Brazil

^[2] IMED, Merid Fac, Sch Dent, Passo Fundo, RS - Brazil

^[3] Univ Sao Paulo FORP USP, Ribeirao Preto Sch Dent, Dept Dent Mat & Prosthodont, Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 45, n. 16, p. 21038-21043, NOV 2019.
• Citações Web of Science: 0

Resumo

This study compared the physical properties of conventional and monolithic yttria-zirconia (Yz) materials after low-temperature degradation (LTD). Bar-shaped specimens (2.0 mm thick x 4.0 mm wide x 16.0 mm in length) were produced. Autoclave aging was executed at 134 degrees C under 2 bar pressure for 5 h. The surface characteristics were assessed using a confocal laser microscope, microstructural phase alterations via an X-ray diffractometer (XRD), 3-point flexural strength using a universal testing machine, Vickers microhardness via a digital microhardness tester, and toughness using a durometer. Fractured specimens and indented surfaces was observed via a scanning electron microscope for fractography characterization. All of the data underwent specific statistical tests considering their distribution and homogeneity. Regarding topography, different Yz materials were very similar after LTD. Conventional Yz materials were smoother. The XRD data support that both materials were mainly composed of tetragonal crystals, whereas slight monoclinic peaks were detected. Monolithic Yz showed higher flexural strength than conventional Yz. All of the fractures started on surface defects at the side where tensile stress was concentrated (opposite to load application) and propagated to the opposite side. Vickers microhardness and toughness analysis found that conventional Yz had higher performance than monolithic Yz. This study has found that there are slight differences in strength, hardness, and toughness between conventional and monolithic yttria-stabilized zirconia ceramics, although both materials demonstrate adequate performance for clinical use. (AU)

• Processo FAPESP: 16/20538-3 - Avaliação do comportamento mecânico de diferentes sistemas cerâmicos após envelhecimento térmico artificial
• Beneficiário: Stephanie Francoi Poole
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 11/12901-7 - Análise in vitro e in situ da erosão dental e de métodos de prevenção em pacientes portadores da doença do refluxo gastroesofágico
• Beneficiário: Regina Guenka Palma-Dibb
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/25311-7 - Efeito do preenchimento da câmara pulpar com cimento de ionômero de vidro em dentes tratados endodonticamente e reabilitados com endocrowns: Análise in vitro e pelo MEF-3D
• Beneficiário: Erica Alves Gomes
• Modalidade de apoio: Auxílio à Pesquisa - Regular