Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia
Abdel latif, M., el-olimy, G., elebiary, M. (2020). Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia. EKB Journal Management System, 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)), 2467-2479. doi: 10.21608/edj.2020.33503.1158
Marwa Abdel latif; Gehan abdel-momem el-olimy; Manal Ahmed elebiary. "Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia". EKB Journal Management System, 66, Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials), 2020, 2467-2479. doi: 10.21608/edj.2020.33503.1158
Abdel latif, M., el-olimy, G., elebiary, M. (2020). 'Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia', EKB Journal Management System, 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)), pp. 2467-2479. doi: 10.21608/edj.2020.33503.1158
Abdel latif, M., el-olimy, G., elebiary, M. Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia. EKB Journal Management System, 2020; 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)): 2467-2479. doi: 10.21608/edj.2020.33503.1158

Effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia

Egyptian Dental Journal
Article 6, Volume 66, Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials), October 2020, Page 2467-2479  XML PDF (913.44 K)
Document Type: Original Article
DOI: 10.21608/edj.2020.33503.1158
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Authors
Marwa Abdel latif email 1; Gehan abdel-momem el-olimyorcid 2; Manal Ahmed elebiary3
1Dental Biomaterials Department. Tanta University
2biomaterials-faculty of dentistry-tanta university
3head of the dental biomaterials department , faculty of dentistry, tanta university
Abstract
Statement of problem: Zirconia undergoes phase transformation due to low temperature degradation LTD which could deteriorate its optical properties.
Objectives: Current study was conducted to evaluate the effect of shading and hydrothermal aging on optical properties of partially and fully stabilized zirconia.
Materials and methods: Two commercially available zirconia products, high-translucent PSZ (Prettau®, Zirkonzahn) and ultra-translucent FSZ (Prettau®, Anterior, Zirkonzahn) were assessed. 80 disc shaped specimens (12×1 mm) were prepared; half of the specimens were shaded using acid-free coloring solution. Half of the specimens were subjected to accelerated aging using autoclave (134°c at 2 MPa) for 5 hours. The specimens were divided into 4 subgroups. Non-shaded, non-aged (control), (non-shaded, aged group), (shaded, non-aged group) and (shaded, aged group). Contrast ratio CR and translucency parameter TP were evaluated in each subgroup using reflective spectrophotometer. X-ray diffraction analysis was used to measure the amount of tetragonal to monoclinic phase transformation. Microstructural analysis was evaluated using atomic force microscope. SPSS program was used to evaluate the data (P≤0.05).

Results: FSZ recorded higher translucency parameter and lower contrast ratio than PSZ; which were significantly affected by shading and aging in all subgroups except for non-shaded aged subgroups of PSZ.

Conclusions: Shading and aging induced tetragonal to monoclinic transformation in PSZ and FSZ which lead to changes in their optical properties.
Keywords
Monolithic Zirconia; Hydrothermal aging; Shading; Contrast Ratio; Translucency Parameter
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