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Coatings 2017, 7(8), 130; https://doi.org/10.3390/coatings7080130

Influence of Grit-Blasting and Hydrofluoric Acid Etching Treatment on Surface Characteristics and Biofilm Formation on Zirconia

1
Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
2
Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou 510275, China
3
Department of Oral Implantology, Hospital of Stomatology, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou 510275, China
*
Authors to whom correspondence should be addressed.
Received: 23 June 2017 / Revised: 16 August 2017 / Accepted: 16 August 2017 / Published: 20 August 2017
(This article belongs to the Special Issue Dental Implant Surface: Science and Technology)
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Abstract

The objective of this study was to investigate the effect of hydrofluoric acid etching treatment on the surface characteristics of zirconia and Streptococcus sanguinis (S. sanguinis) and Porphyromonas gingivalis (P. gingivalis) biofilm formation on zirconia. Zirconia specimens were prepared with different treatments, including being polished with 1000-grit SiC abrasive paper as the control group (Group C), grit-blasted with 110 μm silica-coated alumina particles (Group GB), etched with 40% hydrofluoric acid for 25 min at 100 °C (Group HF), and grit-blasted with 110 μm silica-coated alumina particles and then etched with 40% hydrofluoric acid for 25 min at 100 °C (Group GBHF). The highest surface roughness values and hydrophilicity were shown in Group HF and Group GBHF. Scanning electron microscopy (SEM) showed that hydrofluoric acid can create a crater-like appearance on the zirconia surface. An energy-dispersive X-ray (EDX) analysis demonstrated similar element concentration (wt %) in Group C, Group HF, and Group GBHF, but not for Group GB with higher concentrations of Al and Si element. Colony forming unit (CFU) counts showed that a similar amount of S. sanguinis biofilm and significantly lower P. gingivalis biofilm were formed on zirconia surfaces in Group HF and Group GBHF compared to that in Group C after three days of bacteria culture (p < 0.05). These results indicate that hydrofluoric acid etching on zirconia may not increase S. sanguinis and P. gingivalis mature biofilm formation on zirconia. View Full-Text
Keywords: zirconia; hydrofluoric acid; surface topography; biofilm zirconia; hydrofluoric acid; surface topography; biofilm
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Han, A.; Tsoi, J.K.-H.; Matinlinna, J.P.; Chen, Z. Influence of Grit-Blasting and Hydrofluoric Acid Etching Treatment on Surface Characteristics and Biofilm Formation on Zirconia. Coatings 2017, 7, 130.

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