Effect of Sintering Parameters on Translucency, Flexural Strength1and Microstructure of Zirconia Ceramics

Authors

1 Demonstrator, Dental Biomaterial Department, Faculty of Dental Medicine for Girls, Al-Azhar University.

2 Professor of Crowns and Bridges Faculty of Dental Medicine for Girls, Al-Azhar University.

3 Assistant Professor of Dental Biomaterial Faculty of Dental Medicine for Girls, Al-Azhar University

Abstract

Purpose: This study was designated to evaluate the effect of sintering parameters on9translucency, flexural strength, and microstructure of zirconia ceramics. Material and Methods: A total of 30 Cubic Zirconia Discs (DD cubx2) (N=30) with-12-mm-diameter-andk1.2kmm thickness8shade A2 were8milled7using CAD/CAM. Discs were divided into three equal groups (n=10) according to different sintering temperatures Group (1) (1450 °C), Group-2 (1550°C), and Group-3-(1600°C) with a sintering holding time of 2 hours. The9contrast8ratio7(CR)9wasobtained9after0comparing7the3reflectance8of0light3through7the9specimens7over1black7and9white7backgrond using a Reflective spectrophotometer (Model RM200QC, X-Rite, Neu-Isenburg, Germany). Biaxial flexural strength was measured according to ISO 6782-2015 using a universal testing machine by piston-on-three ball technique. The grain size and microstructures of different groups were examined using SEM. Results: Group (1) (1450°C) showed significantly highest mean (CR) values followed by group (2) (1550°C). And group 3 (1600°C) showed the significant lowest mean values. In addition, Regarding the biaxial flexural strength, group (1) (1450°C), group 2 (1550°C), and group 3-(1600°C) showed insignificant mean values. SEM revealed an increase in grain size with increased sintering temperature. Conclusion: Increasing-the-sintering-temperature-of-zirconia-based ceramics will increase their translucency, without affecting their flexural strength.

Keywords

Al-Azhar Journal of Dentistry
Volume 10, Issue 4
October 2023

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