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Document Type

Original Study

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

Biaxial flexural strength, translucency, sintering temperature

Subject Area

Restorative Dentistry Issue (Removable Prosthodontics, Fixed Prosthodontics, Endodontics, Dental Biomaterials, Operative Dentistry)

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