On ( July 2022) , (Dr.Omar Surkhi) published a new study in (Journal of Applied Biomaterials & Functional Materials) titled (Influence of firing temperature and duration on the hardness of dental zirconia for optimum selection of sintering conditions). The article aimed to (to investigate the effect of firing temperature and firing duration on the hardness of dental zirconia to indicate the optimum sintering conditions.).
The results of this study demonstrated that(This study was conducted to indicate the optimum sintering conditions by investigating the influence of firing temperature and firing duration on the hardness of dental zirconia. This study has shown there is a significant positive correlation between the hardness number and the firing duration at a given firing temperature.
Also, Significant positive correlation between the hardness number and the firing temperature at a given firing duration. Based on findings of this study, it can be concluded that the greatest rate of hardness increase with time is associated with groups of firing temperature 1200°C and that highest rate of hardness increase with temperature happened during the first 6 h of sintering process. On the other hand, there is no significant increase in the hardness number when increasing the firing temperature beyond 1200°C.
These results can explained by the fact that at a given firing temperature, increasing the firing duration increases the density of the sintered zirconia and reduces the grain sizes, which contributes significantly to increase in hardness. It has also shown that at a given firing duration, increasing the firing temperature affects the microstructure of sintered zirconia, which creates a more densified material with smaller grain size, thus, significantly increasing the hardness. Overall, our results demonstrate that the Hardness follows the Hall–Petch dependence with the grain size, and the hardness of dental zirconia depends on the firing temperature and firing duration.). For more information about the study, please contact the main author at (This email address is being protected from spambots. You need JavaScript enabled to view it.) or the scientific research office at (This email address is being protected from spambots. You need JavaScript enabled to view it.)
