IADR Abstract Archives
Grain size of YTZP Zirconia with Various Sintering Schedules
Objectives: The flexural strength of zirconia with various sintering schedules has been determined from previous study. In order to understand the origin of such different physical properties, grain size has been observed and measured.
Methods: VITA YZ zirconia was sectioned into bend bars and sintered to produce specimens approximately 4 x 3 x 25 mm. These were randomly sorted into various groups for sintering according to Table 1. After three point bending test, grain size has been observed and measured using Hitachi SU6600 SEM. Statistical analysis was performed using Tukey HSD test at p < 0.05.
Results: Please refer to Table 2.
Conclusions: Rapid sintering cycles produce significantly smaller grain size than standard sintering cycle. Although smaller grain size should increase physical properties in theory, many physical defects (voids in zirconia samples from rapid sintering groups) significantly lower its flexural strength compared to standard sintering cycle.
Methods: VITA YZ zirconia was sectioned into bend bars and sintered to produce specimens approximately 4 x 3 x 25 mm. These were randomly sorted into various groups for sintering according to Table 1. After three point bending test, grain size has been observed and measured using Hitachi SU6600 SEM. Statistical analysis was performed using Tukey HSD test at p < 0.05.
Results: Please refer to Table 2.
Conclusions: Rapid sintering cycles produce significantly smaller grain size than standard sintering cycle. Although smaller grain size should increase physical properties in theory, many physical defects (voids in zirconia samples from rapid sintering groups) significantly lower its flexural strength compared to standard sintering cycle.