Influence of denture cleanser on color stability of metallic material

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  • SHINHARA Takuya
    Department of Removable Prosthodontics, Osaka Dental University
  • HONG Guang
    Liaison Center for Innovative Dentistry, Graduate School of Dentistry, Tohoku University
  • MAEDA Takeshi
    Department of Removable Prosthodontics, Osaka Dental University
  • SANO Yuya
    Division of Advanced Prosthetic Dentistry, Graduate School of Dentistry, Tohoku University
  • SASAKI Keiichi
    Division of Advanced Prosthetic Dentistry, Graduate School of Dentistry, Tohoku University
  • OKAZAKI Joji
    Department of Removable Prosthodontics, Osaka Dental University

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  • 義歯洗浄剤が歯科用金属材料の色調安定性に及ぼす影響
  • ギシ センジョウザイ ガ シカ ヨウキンゾク ザイリョウ ノ シキチョウ アンテイセイ ニ オヨボス エイキョウ

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Abstract

The aim of this study was to evaluate the influence of peroxide type, enzyme type, and Ag+-apatite type denture cleansers on the color stability of four commercial metallic materials : cobalt-chromium alloy (Co-Cr), nickel-chromium alloy (Ni-Cr), pure titanium (CpTi), and titanium alloy (Ti-alloy). Color changes were examined with a colorimeter and visual observation during 90 days of denture cleanser immersion. Surface observation of discolored samples was also performed using a scanning electron microscope (SEM). In the samples of Co-Cr and Ni-Cr, no noticeable discoloration was observed. The samples of Ti-alloy immersed in peroxide type and Ag+-apatite type denture cleansers, and sample of CpTi immersed in Ag+-apatite type denture cleanser showed discoloration after 90 days of immersion. SEM images showed roughness caused by corrosion of the metal surface. These results suggest that the color stability of metallic material is influenced by the metal type and type of denture cleanser used.

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