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This study aimed to investigate the effect of final sintering temperature and grain size on the aging resistance and mechanical properties of zirconia fabricated through colloidal and cold isostatic pressing. Zirconia samples appearing as cylindrical discs were prepared and subjected to five different sintering temperatures ranging from 1400 °C to 1600 °C. Grain pullout and rough surfaces were detected on the micrographs of aged samples sintered at more than 1500 °C, indicating surface degradation. The highest flexural strength of non-aged and aged samples was obtained at 1500 °C, whereas excellent fracture toughness was demonstrated by the sample sintered at 1550 °C under non-aged and aged conditions. The hardness properties of all of the samples sintered at various temperatures did not significantly differ. Under the aged conditions, their hardness properties slightly decreased. Overall, the mechanical performance of the aged zirconia slightly deteriorated but remained acceptable for use in an oral environment for 15–20 years. Mechanical performance evaluation after aging revealed that 1500 °C was the appropriate sintering temperature. The mechanical properties and aging resistance of the zirconia samples were greatly dependent on sintering temperature during fabrication.
Amat et al. (Thu,) studied this question.