Fabrication and Characterization of Dental Implants with Yttria-Stabilized Zirconia

Zirconium oxide or zirconia have been usedfor the fabrication of dental implants due to their biocompatibility, hardness, toughness, compressive strength and chemical stability. The aim of this study is investigating the effect of sintering time on the properties of zirconia dental implant.

In this research, which was performed at Department of Dental and Biomedical Materials Science, Nagasaki University, Nagasaki, Japan, at 2019, zirconia-yttria mol.% 3 powder was pressed and sintered at 1450°C at different times (5 samplesfor each condition) and the effect of time on the phase, structural and mechanical properties of the sintered samples was investigated. One-way ANOVA statistical analysis was performed with the 0.05 level of significanceusing Graph Pad Prism 6software.

The results of XRD phase analysis show that sintering time change has a significant effect on the phase changes of the samples and the Vickers hardness of the samples shows a significant increase with increasing sintering time due to shrinkage and decrease in porosity of the samples. But the 12 hour times of sintering caused phase changes in the samples which is not desirable.

Therefore, for the fabrication of zirconia parts with minimum porosity and optimum hardness, a moderate sintering time (6 hours) is recommended.