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@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 (37C/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 = "04 dez. 2020"
}


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