Artigo de peri??dico
Y-TZP surface behavior under two different milling systems and three different accelerated aging protocols
Registro en:
0026-4970
6
67
10.23736/S0026-4970.18.04138-9
aguardando
Sem Percentil
48.67
Autor
PIVA, AMANDA M. da
TRIBST, JOAO P.
GONDIM, LAISA D.
RIBEIRO, ISABELLA L.
CAMPOS, FERNANDA
ARATA, ANELYSE
SOUZA, RODRIGO O.
Resumen
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.