J Adv Prosthodont.  2018 Feb;10(1):43-49. 10.4047/jap.2018.10.1.43.

Influence of nano alumina coating on the flexural bond strength between zirconia and resin cement

• Akay C
• Tanış MC
• Mumcu E
• Kılıçarslan MA
• Åžen M

• KMID: 2403997
• DOI: http://doi.org/10.4047/jap.2018.10.1.43

Abstract

PURPOSE
The purpose of this in vitro study is to examine the effects of a nano-structured alumina coating on the adhesion between resin cements and zirconia ceramics using a four-point bending test.
MATERIALS AND METHODS
100 pairs of zirconium bar specimens were prepared with dimensions of 25 mm × 2 mm × 5 mm and cementation surfaces of 5 mm × 2 mm. The samples were divided into 5 groups of 20 pairs each. The groups are as follows: Group I (C) - Control with no surface modification, Group II (APA) - airborne-particle-abrasion with 110 µm high-purity aluminum oxide (Al2O3) particles, Group III (ROC) - airborne-particle-abrasion with 110 µm silica modified aluminum oxide (Alâ‚‚O₃ + SiO2) particles, Group IV (TCS) - tribochemical silica coated with Al2O3 particles, and Group V (AlC) - nano alumina coating. The surface modifications were assessed on two samples selected from each group by atomic force microscopy and scanning electron microscopy. The samples were cemented with two different self-adhesive resin cements. The bending bond strength was evaluated by mechanical testing.
RESULTS
According to the ANOVA results, surface treatments, different cement types, and their interactions were statistically significant (P < .05). The highest flexural bond strengths were obtained in nanostructured alumina coated zirconia surfaces (50.4 MPa) and the lowest values were obtained in the control group (12.00 MPa), both of which were cemented using a self-adhesive resin cement.
CONCLUSION
The surface modifications tested in the current study affected the surface roughness and flexural bond strength of zirconia. The nano alumina coating method significantly increased the flexural bond strength of zirconia ceramics.

Keyword

Surface modification; Zirconia; Nano-structured alumina coating; Four-point bending

MeSH Terms

Aluminum Oxide*
Cementation
Ceramics
In Vitro Techniques
Methods
Microscopy, Atomic Force
Microscopy, Electron, Scanning
Resin Cements*
Silicon Dioxide
Zirconium
Aluminum Oxide
Resin Cements
Silicon Dioxide
Zirconium

Figure

• 

  Fig. 1 SEM images of zirconia samples after surface treatments.(×10,000, bar 10 µm): (A) airborne-particle abrasion with 110 µm aluminum oxide particles (B) airborne-particle abrasion with 110 µm silica-modified aluminum oxide particles (C) airborne-particle abrasion with 30 µm silica-coated aluminum oxide particles (D) nano-structured alumina coating.

• 

  Fig. 2 AFM images of zirconia samples after different surface treatments. (A) airborne-particle abrasion with 110 µm aluminum oxide particles (B) airborne-particle abrasion with 110 µm silica-modified aluminum oxide particles (C) airborne-particle abrasion with 30 µm silicacoated aluminum oxide particles (D) nano-structured alumina coating. Differences in zirconia surface texture were evident according to the conditioning treatment performed. A more retentive surface was evident coated with nano-structured alumina.

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