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Chipping Resistance of Nanosilica Treated Zirconia Cores Veneerd with Porcelain after Thermocycling and Cycling Loading


Affiliations
1 Assistant Lecturer of Dental Material, Biomaterials Department, Faculty of Dentistry, Minia University, Egypt
2 Professor of Dental Materials, Head of Biomaterials department and Dean of Faculty of Dentistry, Minia University, Egypt
3 Professor of Dental Materials, Cairo University, Egypt
     

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Aim: This study was conducted to evaluate the effect of nanosilia surface coating of pre-sintered zirconia on chipping of veneered zirconia crowns after thermocycling and cyclic loading. Method: Twenty zirconia cores were subjected to nanosilica slurry treatment before sintering then veneered and fired to produce crowns. The crowns ere cemented by resin cement on their epoxy dies and 10 crowns were subjected to 10000 thermocycles and 10000cyclic loading. All crowns were loaded till chipping of veneer layer then the chipped surfaces were examined by SEM/EDX. Results: Crowns which were subjected to thermocycling and cyclic loading gave lower chipping resistance than the non-aged crowns. Conclusions: Treatment of zirconia cores with nanosilica before sintering and after thermal and mechanical aging didn’t increase the chipping resistance of the veneer layer.

Keywords

Nanosilica, Zirconia,Chipping,Veneer
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  • Chipping Resistance of Nanosilica Treated Zirconia Cores Veneerd with Porcelain after Thermocycling and Cycling Loading

Abstract Views: 90  |  PDF Views: 0

Authors

Hanaa F. Mahmoud
Assistant Lecturer of Dental Material, Biomaterials Department, Faculty of Dentistry, Minia University, Egypt
Yaser F. Gomaa
Professor of Dental Materials, Head of Biomaterials department and Dean of Faculty of Dentistry, Minia University, Egypt
A. Nour A. Habib
Professor of Dental Materials, Cairo University, Egypt

Abstract


Aim: This study was conducted to evaluate the effect of nanosilia surface coating of pre-sintered zirconia on chipping of veneered zirconia crowns after thermocycling and cyclic loading. Method: Twenty zirconia cores were subjected to nanosilica slurry treatment before sintering then veneered and fired to produce crowns. The crowns ere cemented by resin cement on their epoxy dies and 10 crowns were subjected to 10000 thermocycles and 10000cyclic loading. All crowns were loaded till chipping of veneer layer then the chipped surfaces were examined by SEM/EDX. Results: Crowns which were subjected to thermocycling and cyclic loading gave lower chipping resistance than the non-aged crowns. Conclusions: Treatment of zirconia cores with nanosilica before sintering and after thermal and mechanical aging didn’t increase the chipping resistance of the veneer layer.

Keywords


Nanosilica, Zirconia,Chipping,Veneer



DOI: https://doi.org/10.37506/v11%2Fi2%2F2020%2Fijphrd%2F194986