Y-TZP surface behavior under two different milling systems and three different accelerated aging protocols

PIVA, AMANDA M. da; TRIBST, JOAO P.; GONDIM, LAISA D.; RIBEIRO, ISABELLA L.; CAMPOS, FERNANDA; ARATA, ANELYSE; SOUZA, RODRIGO O.

Y-TZP surface behavior under two different milling systems and three different accelerated aging protocols

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2018

Autores IPEN

ANELYSE ARATA

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Minerva Stomatologica

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BACKGROUND: To evaluate the influence of aging and milling system on zirconia surface roughness (SR) and phase transformation. METHODS: Eighty crowns were divided in two groups according to yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramic milling system (CAD-Neodent or MAD-Zirkonzahn). The crowns were submitted to different aging protocols (N.= 10): 1) no aging; 2) autoclaving; 3) pH cycling; or 4) thermocycling. Next, the samples were submitted to an optical profilometry analysis to determine differences in the SR (mu m). An X-ray diffraction analysis (XRD) was performed to quantify the percentage of monoclinic phase transformation. SR data was analyzed by two-way ANOVA (alpha=0.5%). RESULTS: Aging protocol (P=0.42) and milling system (P=0.08) had no influence on the SR. However, the number of monoclinic phases was influenced by the autoclaving and pH cycling. CONCLUSIONS: The surface roughness of zirconia-based crowns was not influenced by low temperature degradation or milling system. Regarding the phase transformation, autoclaving and pH-cycling aging presented a monoclinic phase increase when compared to the control group and thermocycled groups.

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PIVA, AMANDA M. da; TRIBST, JOAO P.; GONDIM, LAISA D.; RIBEIRO, ISABELLA L.; CAMPOS, FERNANDA; ARATA, ANELYSE; SOUZA, RODRIGO O. Y-TZP surface behavior under two different milling systems and three different accelerated aging protocols. Minerva Stomatologica, v. 67, n. 6, p. 237-245, 2018. DOI: 10.23736/S0026-4970.18.04138-9. Disponível em: http://repositorio.ipen.br/handle/123456789/29869. Acesso em: 23 Apr 2024.

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