Light transmittance of zirconia as a function of thickness and microhardness of resin cements under different thicknesses of zirconia
Med. oral patol. oral cir. bucal (Internet)
; 18(2): 212-218, mar. 2013. ilus, tab
Article
in English
| IBECS
| ID: ibc-112388
Responsible library:
ES1.1
Localization: BNCS
ABSTRACT
Objective:
The objective of this study was to compare microhardness of resin cements under different thicknesses of zirconia and the light transmittance of zirconia as a function of thickness. Studydesign:
A total of 126 disc-shaped specimens (2 mm in height and 5 mm in diameter) were prepared from dual-cured resin cements (RelyX Unicem, Panavia F and Clearfil SA cement). Photoactivation was performed by using quartz tungsten halogen and light emitting diode light curing units under different thicknesses of zirconia. Then the specimens (n=7/per group) were stored in dry conditions in total dark at 37°C for 24 h. The Vickers hardness test was performed on the resin cement layer with a microhardness tester. Statistical significance was determined using multifactorial analysis of variance (ANOVA) (alpha=.05). Light transmittance of different thicknesses of zirconia (0.3, 0.5 and 0.8 mm) was measured using a hand-held radiometer (Demetron, Kerr). Data were analyzed using one-way ANOVA test (alpha=.05).Results:
ANOVA revealed that resin cement and light curing unit had significant effects on microhardness (p < 0.001). Additionally, greater zirconia thickness resulted in lower transmittance. There was no correlation between the amount of light transmitted and microhardness of dual-cured resin cements (r = 0.073, p = 0.295).Conclusion:
Although different zirconia thicknesses might result in insufficient light transmission, dual-cured resin cements under zirconia restorations could have adequate microhardness (AU)
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Collection:
National databases
/
Spain
Database:
IBECS
Main subject:
Zirconium
/
Resin Cements
Limits:
Humans
Language:
English
Journal:
Med. oral patol. oral cir. bucal (Internet)
Year:
2013
Document type:
Article
Institution/Affiliation country:
Department of Prosthodontics/ Turkey
/
Department of Prosthodontics/Turkey