Influence of surface treatments and resin cement selection on bonding to densely-sintered zirconium-oxide ceramic



Influence of surface treatments and resin cement selection on bonding to densely-sintered zirconium-oxide ceramic




    Journal of Prosthetic Dentistry, 2009-11-01, Volume 102, Issue 5, Pages 327-327, Copyright © 2009


    de Oyagüe RC, Monticelli F, Toledano M, Osorio E, Ferrari M, Osorio R.

    Dent Mater 2009;25:172-9. Epub 2008 Jul 14.


    Objectives

    To evaluate the effect of surface conditioning on the microtensile bond strength of zirconium-oxide ceramic to dual-cured resin cements.


    Methods

    Eighteen cylinder-shaped zirconium-oxide ceramic blocks (Cercon Zirconia, Dentsply) were treated as follows: (1) Sandblasting with 125 μm aluminum-oxide (Al 2 O 3 ) particles; (2) tribochemical silica coating using 50 μm Al2O3 particles modified by silica; (3) no treatment. Each ceramic cylinder was duplicated in composite resin (Tetric Evo Ceram, Ivoclar-Vivadent) using a silicon mold. Composite cylinders were bonded to conditioned ceramics using: (1) Calibra (Dentsply Caulk); (2) Clearfil Esthetic Cement (Kuraray); (3) RelyX Unicem (3M ESPE). After 24 h bonded specimens were cut into microtensile sticks that were loaded in tension until failure. Data were analyzed using two-way ANOVA and Student-Newman-Keuls test for multiple comparisons ( p <0.05). Failure mode was recorded and the interfacial morphology of debonded specimens was observed using a scanning electron microscope (SEM). Surface topography and ceramic average surface roughness were analyzed under an atomic force microscope (AFM).


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    Influence of surface treatments and resin cement selection on bonding to densely-sintered zirconium-oxide ceramic Journal of Prosthetic Dentistry, 2009-11-01, Volume 102, Issue 5, Pages 327-327, Copyright © 2009 de Oyagüe RC, Monticelli F, Toledano M, Osorio E, Ferrari M, Osorio R. Dent Mater 2009;25:172-9. Epub 2008 Jul 14. Objectives To evaluate the effect of surface conditioning on the microtensile bond strength of zirconium-oxide ceramic to dual-cured resin cements. Methods Eighteen cylinder-shaped zirconium-oxide ceramic blocks (Cercon Zirconia, Dentsply) were treated as follows: (1) Sandblasting with 125 μm aluminum-oxide (Al 2 O 3 ) particles; (2) tribochemical silica coating using 50 μm Al2O3 particles modified by silica; (3) no treatment. Each ceramic cylinder was duplicated in composite resin (Tetric Evo Ceram, Ivoclar-Vivadent) using a silicon mold. Composite cylinders were bonded to conditioned ceramics using: (1) Calibra (Dentsply Caulk); (2) Clearfil Esthetic Cement (Kuraray); (3) RelyX Unicem (3M ESPE). After 24 h bonded specimens were cut into microtensile sticks that were loaded in tension until failure. Data were analyzed using two-way ANOVA and Student-Newman-Keuls test for multiple comparisons ( p <0.05). Failure mode was recorded and the interfacial morphology of debonded specimens was observed using a scanning electron microscope (SEM). Surface topography and ceramic average surface roughness were analyzed under an atomic force microscope (AFM). Results Significant changes in zirconia surface roughness occurred after sandblasting ( p <0.001). Bond strength of Clearfil cement to zirconia was significantly higher than that of RelyX Unicem and Calibra, regardless of the surface treatment ( p <0.001). When using Calibra, premature failures occurred in non-treated and silica coated zirconia surfaces. Significance The phosphate monomer-containing luting system (Clearfil Esthetic Cement) is recommended to bond zirconia ceramics and surface treatments are not necessary. Reprinted with permission of the Academy of Dental Materials.

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