J Korean Acad Prosthodont.  2016 Oct;54(4):354-363. 10.4047/jkap.2016.54.4.354.

Influence of nano-structured alumina coating treatment on shear bond strength between zirconia ceramic and resin cement

• Kim DW
• Lee JJ
• Kim KA
• Seo JM

• KMID: 2388213
• DOI: http://doi.org/10.4047/jkap.2016.54.4.354

Abstract

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℃. 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.

Keyword

Zirconia; Shear bond strength; Alumina coating; Thermocycling; Resin cement

MeSH Terms

Aluminum Oxide*
Ceramics*
Hot Temperature
Hydrolysis
Resin Cements*
Aluminum Oxide
Resin Cements

Figure

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  Fig. 1. (A) FE-SEM image (×5,000) demonstrating polished Y-TZP surface, (B) FE-SEM image (×5,000) demonstrating airborne particle abraded Y-TZP surface, (C) FE-SEM image (×5,000) demonstrating tribochemical coating treated Y-TZP surface.

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  Fig. 2. (A) FE-SEM image (×50,000) demonstrating the large retentive surface architecture created after completion of nano-structured alumina coating on polished Y-TZP surface, (B) FE-SEM image (×50,000) demonstrating the large retentive surface architecture created after completion of nano-structured alumina coating on air abraded Y-TZP surface.

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  Fig. 3. Shear-bond strength before thermocycling. The bars represent the SDs. ∗ indicates significant difference (P<.05).

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  Fig. 4. Shear-bond strength after thermocycling. The bars represent the SDs. ∗ indicates significant difference (P<.05).

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  Fig. 5. Influence of thermocycling on changes in shear bond strength of each group. ∗ indicates significant difference (P<.05).

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  Fig. 6. FE-SEM image (×2,000) demonstrating adhesive failure mode of A group.

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  Fig. 7. FE-SEM image (×2,000) demonstrating mixed failure mode of R group.

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  Fig. 8. (A) FE-SEM image (×5,000) demonstrating cohesive failure mode of PC group, (B) FE-SEM image (×40,000) demonstrating high magnification of box in Fig. 8A.

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  Fig. 9. (A) FE-SEM image (×2,000) demonstrating cohesive failure mode of AC group, (B) FE-SEM image (×20,000) demonstrating high magnification of box in Fig. 9A.

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