Influence of Presintering Parameters on the Mechanical Properties of Presintered Dental Zirconia Block

  • Noor Faeizah Faeizah Amat Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia
  • Shari Lawuo Raji Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia
  • Andanasuti Muchtar Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia
  • Muhammad Sufiyan Amril Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia
  • Mariyam Jameelah Ghazali Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia
  • Norziha Yahaya 2 Department of Prosthodontic, Faculty of Dentistry, Universiti Kebangsaan Malaysia
Keywords: Zirconia, pre-sintering, dental restorations, slip casting, cold isostatic pressing

Abstract

This study aimed to investigate the effects of presintering parameters on the mechanical and microstructural properties of presintered zirconia block. The zirconia block was prepared using colloidal and cold isostatic pressing techniques and subsequently subjected to various presintering procedures at 850 °C, 900 °C, and 950 °C with two different heating rates (3 and 10 °C/min). All samples were evaluated in terms of hardness, density, and morphology. Results showed that the sample porosity decreased with increment in the presintering temperature. On the contrary, the Vickers hardness increased from 1.8 GPa at 850 °C to 2.7 GPa at 950 °C at 10 °C/min heating rate. The sintering temperature of 950 °C with 3 °C/min heating rate was considered the most suitable parameter among presintering procedures, with high theoretical density (96.2%) and appropriate hardness (1.27 GPa) that are within the range of commercial zirconia block hardness values for restoration milling procedure. Furthermore, to sinter the block samples successfully without considerable failure, the heating and cooling rates should be lowered to ≤3 °C/min. Therefore, on the basis of these results, the forming methods and the sintering temperature influence the resultant mechanical and microstructural properties of the final sample.

Downloads

Download data is not yet available.
Published
19-11-2018
How to Cite
Amat, N. F. F., Raji, S. L., Muchtar, A., Amril, M. S., Ghazali, M. J., & Yahaya, N. (2018). Influence of Presintering Parameters on the Mechanical Properties of Presintered Dental Zirconia Block. International Journal of Integrated Engineering, 10(5). Retrieved from https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/2967
Section
Special Issue 2018: Mechanical Engineering