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논문 기본 정보

자료유형
학술저널
저자정보
Laura Viviana Calvache Arcila (São Paulo State University (UNESP) Institute of Science and Technology São José Dos Campos Brazil) Nathália de Carvalho Ramos (São Paulo State University (UNESP) Institute of Science and Technology São José Dos Campos Brazil) Tiago Moreira Bastos Campos (Technological Institute of Aeronautics Physics department São José dos Campos Brazil) Kiara Serafini Dapieve (College of Dentistry Federal University of Santa Maria (UFSM) Santa Maria Brazil) Luiz Felipe Valandro (College of Dentistry Federal University of Santa Maria (UFSM) Santa Maria Brazil) Renata Marques de Melo (São Paulo State University (UNESP)) Marco Antonio Bottino (São Paulo State University (UNESP) Institute of Science and Technology São José Dos Campos Brazil)
저널정보
대한치과보철학회 The Journal of Advanced of Prosthodontics The Journal of Advanced of Prosthodontics 제13권 제6호
발행연도
2021.12
수록면
385 - 395 (11page)

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PURPOSE. To characterize the microstructure of three yttria partially stabilized zirconia ceramics and to compare their hardness, indentation fracture resistance (IFR), biaxial flexural strength (BFS), and fatigue flexural strength. MATERIALS AND METHODS. Disc-shaped specimens were obtained from 3Y-TZP (Vita YZ HT), 4Y-PSZ (Vita YZ ST) and 5Y-PSZ (Vita YZ XT), following the ISO 6872/2015 guidelines for BFS testing (final dimensions of 12 mm in diameter, 0.7 and 1.2 ± 0.1 mm in thicknesses). Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were performed, and mechanical properties were assessed by Vickers hardness, IFR, quasi-static BFS and fatigue tests. RESULTS. All ceramics showed similar chemical compositions, but mainly differed in the amount of yttria, which was higher as the amount of cubic phase in the diffractogram (5Y-PSZ > 4Y-PSZ > 3Y-TZP). The 4Y- and 5Y-PSZ specimens showed surface defects under SEM, while 3Y-TZP exhibited greater grain uniformity on the surface. 5Y-PSZ and 3Y-TZP presented the highest hardness values, while 3Y-TZP was higher than 4Y- and 5Y-PSZ with regard to the IFR. The 5Y-PSZ specimen (0.7 and 1.2 mm) showed the worst mechanical performance (fatigue BFS and cycles until failure), while 3Y-TZP and 4Y-PSZ presented statistically similar values, higher than 5Y-PSZ for both thicknesses (0.7 and 1.2 mm). Moreover, 3Y-TZP showed the highest (1.2 mm group) and the lowest (0.7 mm group) degradation percentage, and 5Y-PSZ had higher strength degradation than 4Y-PSZ group. CONCLUSION. Despite the microstructural differences, 4Y-PSZ and 3Y-TZP had similar fatigue behavior regardless of thickness. 5Y-PSZ had the lowest mechanical performance.

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