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:: Volume 33, Issue 1 And 2 (In Progress 2021) ::
J Islam Dent Assoc Iran 2021, 33(1 And 2): 22-32 Back to browse issues page
Effects of Aging on Mechanical and Optical Properties of Translucent and Opaque Zirconia
Sima Abbasimoghaddam1, Seyed Mohammad Reza Hakimaneh2, Tabassom Hooshmand3, Sayed Shojaedin Shayegh *4
1- Dental Student, Faculty of Dentistry, Shahed University, Tehran, Iran
2- Assistant Professor, Department of prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran
3- Professor, Department of Dental Biomaterials, School of Dentistry/Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran
4- Associate Professor, Department of prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran , shayegh.hakim@gmail.com
Abstract:   (179 Views)
Background and Aim: This study evaluated the effect of hydrothermal aging on opti-cal and mechanical properties of opaque and translucent zirconia.
Materials and Methods: For the biaxial flexural strength (BFS) test, 40 sintered opaque and translucent disc-shaped zirconia, and for the assessment of surface rough-ness and optical properties, 20 specimens were fabricated and artificially aged in an autoclave for 10 h. The CIE L*a*b* color parameters were measured. The translucency parameter (TP), contrast ratio (CR), opalescence (OP), and color difference against a white (ΔEW) and a black (ΔEB) background were all calculated. The surface roughness (Ra and Rz) was analyzed using a profilometer and the BFS test was performed at a crosshead speed of 1 mm/min. Data were analyzed using two-way ANOVA, t-test, and Mann-Whitney test (α=0.05).
Results: The mean Ra (P=0.023) and Rz (P=0.011) significantly decreased after aging. Aging had no significant effect on TP (P=0.384), CR (P=0.261), or BFS (P=0.912). The mean TP values of translucent specimens were significantly higher than those of opaque specimens (P=0.046). For translucent specimens, the mean OP did not signifi-cantly change after aging (P=0.685) but aging significantly increased the OP of opaque specimens (P=0.007). The mean ΔEW and ΔEB of translucent specimens were higher than those of opaque specimens (P=0.044 and P=0.019, respectively).
Conclusion: Although aging affected the OP parameter, other optical properties and also BFS of both zirconia types were not affected by hydrothermal aging. However, the surface roughness of both zirconia types significantly decreased as a re-sult of aging.
Keywords: Zirconium Oxide, Aging, Surface Properties, Flexural Strength
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Type of Study: Orginal | Subject: Porosthodontics
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Abbasimoghaddam S, Hakimaneh S M R, Hooshmand T, Shayegh S S. Effects of Aging on Mechanical and Optical Properties of Translucent and Opaque Zirconia. J Islam Dent Assoc Iran. 2021; 33 (1 and 2) :22-32
URL: http://jidai.ir/article-1-2132-en.html


Volume 33, Issue 1 And 2 (In Progress 2021) Back to browse issues page
Journal of Islamic Dental Association of Iran

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