Evaluation of the shear bond strength of dental porcelain and the low magnetic susceptibility Zr-14Nb alloy

Yuka Kajima; Atsushi Takaichi; Tohru Yasue; Hisashi Doi; Hidekazu Takahashi; Takao Hanawa; Noriyuki Wakabayashi

doi:10.1016/j.jmbbm.2015.08.008

Evaluation of the shear bond strength of dental porcelain and the low magnetic susceptibility Zr-14Nb alloy

J Mech Behav Biomed Mater. 2016 Jan:53:131-141. doi: 10.1016/j.jmbbm.2015.08.008. Epub 2015 Aug 13.

Authors

Yuka Kajima¹, Atsushi Takaichi², Tohru Yasue³, Hisashi Doi⁴, Hidekazu Takahashi⁵, Takao Hanawa⁴, Noriyuki Wakabayashi¹

Affiliations

¹ Removable Partial Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
² Removable Partial Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address: [email protected].
³ Fixed Prosthetic Engineering, School of Oral Health Care Sciences, Faculty of Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
⁴ Metallic Biomaterials, Biomedical Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
⁵ Oral Biomaterials Engineering, Course of Oral Health Engineering, School of Oral Health Care Sciences, Faculty of Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.

PMID: 26318573
DOI: 10.1016/j.jmbbm.2015.08.008

Abstract

The aim of this study was to investigate the bond strength of dental porcelain and the preheated Zr-14Nb alloy, and compare this strength with that of titanium. White oxide layers, which were predominantly composed of monoclinic zirconia, were formed on the preheated sample groups, and exhibited a greater roughness than the control samples. At the metal-ceramic interface, a greater Nb diffusion range was observed than in the control samples. The bond strengths of the samples subjected to 20min preheating treatment were the lowest (33.6 ± 3.2 MPa), which may be ascribed to the formation of a brittle thick oxide layer under excessive heat treatment. The samples subjected to this heat treatment for 5 min exhibited the highest mean bond strength (43.7 ± 5.9 MPa), which was significantly higher than that of titanium (35.3 ± 3.5 MPa). Thus, the Zr-14Nb alloy is a promising candidate for fixed dental prosthesis, as long as the appropriate treatment conditions are adopted.

Keywords: Dental porcelain; Fixed dental prostheses; Preheating treatment; Shear bond strength; Zr–Nb alloy.

MeSH terms

Alloys / chemistry*
Dental Porcelain*
Hot Temperature
Magnetic Phenomena*
Niobium / chemistry*
Shear Strength*
Surface Properties
Zirconium / chemistry*

Substances

Alloys
Niobium
Dental Porcelain
Zirconium