Effect of Accelerated Aging on the Translucency of Monolithic Zirconia at Minimal Thickness
(2020). Effect of Accelerated Aging on the Translucency of Monolithic Zirconia at Minimal Thickness. EKB Journal Management System, 23(1), 7-14. doi: 10.21608/ajdsm.2020.108456
. "Effect of Accelerated Aging on the Translucency of Monolithic Zirconia at Minimal Thickness". EKB Journal Management System, 23, 1, 2020, 7-14. doi: 10.21608/ajdsm.2020.108456
(2020). 'Effect of Accelerated Aging on the Translucency of Monolithic Zirconia at Minimal Thickness', EKB Journal Management System, 23(1), pp. 7-14. doi: 10.21608/ajdsm.2020.108456
Effect of Accelerated Aging on the Translucency of Monolithic Zirconia at Minimal Thickness. EKB Journal Management System, 2020; 23(1): 7-14. doi: 10.21608/ajdsm.2020.108456

Effect of Accelerated Aging on the Translucency of Monolithic Zirconia at Minimal Thickness

Al-Azhar Journal of Dental Science
Article 2, Volume 23, Issue 1, January 2020, Page 7-14  XML PDF (376.51 K)
Document Type: Original Article
DOI: 10.21608/ajdsm.2020.108456
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Abstract
Objective: The objective of this study was to evaluate the effect of accelerated aging on the translucency of two monolithic zirconia ceramics used at their minimal thickness. Materials and methods: A total of 20 disc-shaped specimens (10x10x0.5 mm) were prepared from two zirconia blanks, high-translucent partially-stabilized tetragonal zirconia (Zolid ht+) and ultra-translucent fully-stabilized cubic zirconia (Zolid fx), and divided into two groups (n=10). An integrating sphere reflective light recording spectrophotometer was used to assess the color parameters L*, a*, and b* before and after artificial accelerated aging for 5 hours in an autoclave at 134°C with 2 bar steam pressure. The Translucency Parameter (TP) was calculated based on TP=[(∆L*)2+(∆a*)2+(∆b*)2]1/2. The tests of homogeneity of variance, normality, and 1-way ANOVA statistical analysis of variance were performed by Graph Pad InStat software for windows (α=.05). Results: A statistically significant higher mean TP value was recorded with fully-stabilized cubic zirconia group compared to that of partially-stabilized tetragonal zirconia, both before (P=.003*˂.05) and after (P<.0001*<.05) accelerated aging. Artificial accelerated aging had a significant effect on the translucency of both fully-stabilized cubic zirconia (P=.0227*<.05) and partially-stabilized tetragonal zirconia (P=.023*<.05) increasing the mean TP value of both materials. Conclusions: Within the limitations of this in vitro study, it was found that accelerated aging had a significant effect on the translucency of both fully-stabilized cubic and partially-stabilized tetragonal monolithic zirconia, causing an increase in the mean TP value of both materials.
 
Keywords
Key Words: Translucency; monolithic zirconia; accelerated aging
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