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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 6
[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
Total Affiliations: 3
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 45, n. 16, p. 21038-21043, NOV 2019.
Web of Science Citations: 0

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)

FAPESP's process: 16/20538-3 - Evaluation of the mechanical behavior of different ceramic systems after artificial thermical aging
Grantee:Stephanie Francoi Poole
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 11/12901-7 - In vitro and in situ analysis of dental erosion and prevention methods in patients with gastroesophageal reflux disease
Grantee:Regina Guenka Palma-Dibb
Support Opportunities: Regular Research Grants
FAPESP's process: 16/25311-7 - Effect of pulp chamber filling with glass ionomer cement in endodontically treated teeth rehabilitated with endocrowns: in vitro and MEF-3D analysis
Grantee:Erica Alves Gomes
Support Opportunities: Regular Research Grants