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Materials 2015, 8(3), 850-866;

Improved Resin–Zirconia Bonding by Room Temperature Hydrofluoric Acid Etching

Department of Medical & Biological Engineering, Graduate School, Kyungpook National University, 2-188-1 Samduk-dong, Jung-gu, Daegu 700-412, Korea
Korea Textile Development Institute, 1083 Jungri-dong, Seo-gu, Daegu 703-712, Korea
Department of Dental Biomaterials, School of Dentistry, Kyungpook National University, 2-188-1 Samduk-dong, Jung-gu, Daegu 700-412, Korea
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Ihtesham ur Rehman
Received: 14 December 2014 / Revised: 12 February 2015 / Accepted: 15 February 2015 / Published: 2 March 2015
(This article belongs to the Special Issue Dental Materials)
View Full-Text   |   Download PDF [1646 KB, uploaded 2 March 2015]   |  


This in vitro study was conducted to evaluate the shear bond strength of “non-self-adhesive” resin to dental zirconia etched with hydrofluoric acid (HF) at room temperature and to compare it to that of air-abraded zirconia. Sintered zirconia plates were air-abraded (control) or etched with 10%, 20%, or 30% HF for either 5 or 30 min. After cleaning, the surfaces were characterized using various analytical techniques. Three resin cylinders (Duo-Link) were bonded to each treated plate. All bonded specimens were stored in water at 37 °C for 24 h, and then half of them were additionally thermocycled 5000 times prior to the shear bond-strength tests (n = 12). The formation of micro- and nano-porosities on the etched surfaces increased with increasing concentration and application time of the HF solution. The surface wettability of zirconia also increased with increasing surface roughness. Higher concentrations and longer application times of the HF solution produced higher bond-strength values. Infiltration of the resin into the micro- and nano-porosities was observed by scanning electron microscopy. This in vitro study suggests that HF slowly etches zirconia ceramic surfaces at room temperature, thereby improving the resin–zirconia bond strength by the formation of retentive sites. View Full-Text
Keywords: zirconia ceramic; resin–zirconia bonding; etching; hydrofluoric acid zirconia ceramic; resin–zirconia bonding; etching; hydrofluoric acid

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, M.-H.; Son, J.S.; Kim, K.-H.; Kwon, T.-Y. Improved Resin–Zirconia Bonding by Room Temperature Hydrofluoric Acid Etching. Materials 2015, 8, 850-866.

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