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KMID : 0362420160540040354
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Journal of Korean Academy of Prosthodontics
2016 Volume.54 No. 4 p.354 ~ p.363
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Influence of nano-structured alumina coating treatment on shear bond strength between zirconia ceramic and resin cement
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Kim Dong-Woon
Lee Jung-Jin
Kim Kyoung-A
Seo Jae-Min
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Abstract
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PURPOSE. The aim of this study was to investigate whether the application of nano-structured alumina coating to the surface of Y-TZP could enhance the bond strength with resin cement.
MATERIALS AND METHODS. A total of 80 zirconia plates were prepared and divided into four groups. : 1) airborne particle abrasion treatment (A) : 2) Rocatec treatment after airborne particle abrasion (R) : 3) nano-structured alumina coating treatment after polishing (PC) and 4) nano-structured alumina coating after airborne particle abrasion (AC). Alumina coating was formed by the hydrolysis of aluminium nitride (AlN) powder and heat treatment at 900。C. Coating patterns were observed with FE-SEM. Resin block was bonded to treated zirconia ceramics using resin cement. The shear bond strengths were measured before and after thermocycling.
RESULTS. The FE-SEM images show a dense and uniform nano-structured alumina coating structure, which enhances shear bond strength by increasing micro mechanical interlocking to resin cement. PC and AC groups showed higher shear bond strengths than A and R groups before and after thermocycling. A and R groups displayed significant drops in shear bond strength after thermocycling. However, PC and AC groups did not show any meaningful decreases in shear bond strength after thermocycling.
CONCLUSION. Treatment of Y-TZP ceramics with nano-structured alumina coating could significantly increase their shear bond strength.
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KEYWORD
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Zirconia, Shear bond strength, Alumina coating, Thermocycling, Resin cement
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