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KMID : 1035320170440020179
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Korean Society for Dental Materials
2017 Volume.44 No. 2 p.179 ~ p.186
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Efficacy of polydopamine-coated titanium in order to improve bond strengths for dental resin cement
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Kim Hyun-Jin
Kwon Tae-Yub
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Abstract
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This study investigated the effects polydopamine-coated titanium surfaces on resin cement shear bond strengths, and characterized polydopamine-coated titanium surfaces. Polydopamine was coated onto the titanium surfaces by immersion in a 2 mg/mL dopamine solution in 10 mM Tris-HCl buffer at pH 8.5. The surface characteristics of polydopamine-coated titanium plates were observed by X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and contact angle measurements. And then, the resin cement bond strengths were evaluated under shear bond strength mode. The formation of polydopamine coating on titanium has been confirmed by XPS analyses of the materials surfaces. The absence of Ti2p peak from polydopamine-coated titanium surface indicates that the polydopamine coating completely has covered the titanium surface. Microstructural features revealed that nanometer-sized bright granules were randomly distributed after coating. The cement shear bond strength of polydopamine-coated titanium plate was higher than the non-coated titanium plates (p<0.05). The more surface wetted with the cement material, the higher the resultant shear bond strength value. As a results, bond strengths are correlated to wettability. These results suggest that a treatment of polydopamine surface provides an effective surface condition to enhance the cement bond strength to titanium.
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KEYWORD
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Polydopamine, titanium, shear bond strength, wettability, resin cement
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