@Article{CotesArMeBoMaSo:2014:EfAgPr,
author = "Cotes, C. and Arata, A. and Melo, R. M. and Bottino, M. A. and
Machado, Jo{\~a}o Paulo Barros and Souza, R. O. A.",
affiliation = "Department of Dental Materials and Prosthodontics, S{\~a}o
Jos{\'e} Dos Campos Dental School, Institute of Science and
TechnologyS{\~a}o Paulo, Brazil and Department of Dental
Materials and Prosthodontics, S{\~a}o Jos{\'e} Dos Campos Dental
School, Institute of Science and TechnologyS{\~a}o Paulo, Brazil
and Department of Dental Materials and Prosthodontics, S{\~a}o
Jos{\'e} Dos Campos Dental School, Institute of Science and
TechnologyS{\~a}o Paulo, Brazil and Department of Dental
Materials and Prosthodontics, S{\~a}o Jos{\'e} Dos Campos Dental
School, Institute of Science and TechnologyS{\~a}o Paulo, Brazil
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
Department of Dentistry, Prosthodontics Unit, Federal University
of Rio Grande do Norte (UFRN)Natal, RN, Brazil",
title = "Effects of aging procedures on the topographic surface, structural
stability, and mechanical strength of a ZrO2-based dental
ceramic",
journal = "Dental Materials",
year = "2014",
volume = "30",
number = "12",
pages = "e396--e404",
keywords = "Analysis of variance (ANOVA), Bending strength, Ceramic materials,
Dental materials, Digital storage, Load testing, Phase
transitions, Pressure vessels, Profilometry, Stability, Surface
analysis, Surface roughness, X ray diffraction, Yttrium alloys,
Zirconia, Bi-axial flexural strength, Kruskal-Wallis tests,
Mechanical cycling, Structural stabilities, Temperature range,
Tetragonal zirconia, Thermomechanical cycling, Yttria-stabilized,
Yttria stabilized zirconia.",
abstract = "Objective. To determine the effects of different aging methods on
the degradation and flexural strength of yttria-stabilized
tetragonal zirconia (Y-TZP) Methods. Sixty disc-shaped specimens
(\∅, 12 mm; thickness, 1.6 mm) of zirconia (Vita InCeram
2000 YZ Cubes, VITA Zahnfabrik) were prepared (ISO 6872) and
randomly divided into five groups, according to the aging
procedures (n = 10): (C) control; (M) mechanical cycling
(15,000,000 cycles/3.8 Hz/200 N); (T) thermal cycling (6,000
cycles/5-55 °C/30s); (TM) thermo-mechanical cycling (1,200,000
cycles/3.8 Hz/200 N with temperature range from 5 °C to 55 °C for
60s each); (AUT) 12h in autoclave at 134 °C/2bars; and (STO)
storage in distilled water (37°C/400 days). After the aging
procedures, the monoclinic phase percentages were evaluated by
X-ray diffraction (XRD), and topographic surface analysis was
performed by 3D profilometry. The specimens were then subjected to
biaxial flexure testing (1 mm/min, load 100 kgf, in water). The
biaxial flexural strength data (MPa) were analyzed by 1-way ANOVA
and Tukey's test (alpha = 0.05). The data for monoclinic phase
percentage and profilometry (Ra) were analyzed by Kruskal-Wallis
and Dunn's tests. Results. ANOVA revealed that flexural strength
was affected by the aging procedures (p = 0.002). The M (781.6
MPa) and TM (771.3 MPa) groups presented lower values of flexural
strength than did C (955 MPa), AUT (955.8 MPa), T (960.8 MPa) and
STO (910.4 MPa). The monoclinic phase percentage was significantly
higher only for STO (12.22%) and AUT (29.97%) when compared with
that of the control group (Kruskal-Wallis test, p = 0.004). In
addition, the surface roughnesses were similar among the groups (p
= 0.165). Significance. Water storage for 400 days and autoclave
aging procedures induced higher phase transformation from
tetragonal to monoclinic; however, they did not affect the
flexural strength of Y-TZP ceramic, which decreased only after
mechanical and thermomechanical cycling.",
doi = "10.1016/j.dental.2014.08.380",
url = "http://dx.doi.org/10.1016/j.dental.2014.08.380",
issn = "0109-5641 and 1879-0097",
label = "scopus 2015-01 CotesArMeBoMaSo:2014:EfAgPr",
language = "en",
targetfile = "Effects of aging procedures on the topographic surface, structural
stability, and mechanical stregth of a ZrO2-based dental
ceramic.pdf",
urlaccessdate = "25 abr. 2024"
}