THE EFFECT OF ZIRCONIA ON FLEXURAL STRENGTH OF IPS EMPRESS 2 CERAMIC

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KERMANSHAH H.; FARZIN EBRAHIMI SH.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Paper Information

Journal: Journal of Dental Medicine Year:2007 | Volume:20 | Issue:2 (51) Page(s): 100-107

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Title

THE EFFECT OF ZIRCONIA ON FLEXURAL STRENGTH OF IPS EMPRESS 2 CERAMIC

Author(s)

KERMANSHAH H. | FARZIN EBRAHIMI SH. | Issue Writer Certificate

Keywords

THREE POINT FLEXURAL STRENGTHQ3

LITHIUM DISILICATE GLASS CERAMICQ3

ALUMINA CERAMIC COREQ3

ZIRCONIA POSTQ3

SCANNING ELECTRON MICROSCOPEQ3

Abstract

Background and Aim: All ceramic, inlay-retained resin bonded fixed partial denture is a conservative method for replacement of missing teeth, because of minimal tooth reduction. The connector between the retainer and the pontic is the weak point of these bridges. Reinforcement of ceramic core will increase the clinical longevity. The aim of this study was to determine the effect of zirconia on flexural strength of IPS Empress 2 core ceramic.Materials and Methods: In this experimental in vitro study, twenty eight bar shape specimens (17x3.1x3.1 mm) were made of four different materials: (1) Slip casting in-ceram alumina core (control group) (2) Hotpressed lithium disilicate core ceramic (IPS Empress 2) (3) IPS Empress 2 with cosmopost (zirconia post) inserted longitudinally in the center of the bar (4) IPS Empress 2 with cosmopost (zirconia post) inserted longitudinally in bottom of the bar. Specimens were subjected to three-point flexure loading with the span of 15mm, at a cross-head speed of 0.5 mm/min. Failure loads were recorded and analyzed using one-way ANOV A and Tomhane Post-hoc tests and p<0.05 was set as the level of significance. Fractured surfaces were then observed by SCANNING ELECTRON MICROSCOPE (SEM). Four additional samples were made as the third group, and zirconia-IPS interface was observed by SEM before fracture.Results: Mean values and standard deviations of THREE POINT FLEXURAL STRENGTHs of groups 1 to 4, were: 378.4±44.6, 258.6±27.5, 144.3±51.7, 230±22.3 MPa respectively. All the groups were statistically different from each other (P<0.05), except groups 2 and 4. The flexural strengths of groups 2, 3, 4 were significantly lower than group 1. Group 3 had the lowest flexural strength. SEM analysis showed that the initiated cracks propagated in the interface of ZIRCONIA POST and IPS Empress 2 ceramic.Conclusion: Based on the results of this study, insetting ZIRCONIA POST (cosmopost) in IPS Empress 2 ceramic does net reinforce all-ceramic inlay retained resin bonded fixed partial dentures.

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APA: Copy

KERMANSHAH, H., & FARZIN EBRAHIMI, SH.. (2007). THE EFFECT OF ZIRCONIA ON FLEXURAL STRENGTH OF IPS EMPRESS 2 CERAMIC. JOURNAL OF DENTAL MEDICINE, 20(2 (51)), 100-107. SID. https://sid.ir/paper/25153/en

Vancouver: Copy

KERMANSHAH H., FARZIN EBRAHIMI SH.. THE EFFECT OF ZIRCONIA ON FLEXURAL STRENGTH OF IPS EMPRESS 2 CERAMIC. JOURNAL OF DENTAL MEDICINE[Internet]. 2007;20(2 (51)):100-107. Available from: https://sid.ir/paper/25153/en

IEEE: Copy

H. KERMANSHAH, and SH. FARZIN EBRAHIMI, “THE EFFECT OF ZIRCONIA ON FLEXURAL STRENGTH OF IPS EMPRESS 2 CERAMIC,” JOURNAL OF DENTAL MEDICINE, vol. 20, no. 2 (51), pp. 100–107, 2007, [Online]. Available: https://sid.ir/paper/25153/en

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