Journal of Dentistry
Volume 35, Issue 2 , Pages 172-176, February 2007

The effect of hydrogen peroxide concentration on metal ion release from dental amalgam

  • S.K. Al-Salehi

      Affiliations

    • Centre for Biomaterials & Tissue Engineering, Department of Adult Dental Care, School of Clinical Dentistry, University of Sheffield, Claremont Crescent, Sheffield S10 2TA, UK
    • Corresponding Author InformationCorresponding author. Tel.: +44 114 271 7931; fax: +44 114 266 5326.
    • ,
  • P.V. Hatton

      Affiliations

    • Centre for Biomaterials & Tissue Engineering, Department of Adult Dental Care, School of Clinical Dentistry, University of Sheffield, Claremont Crescent, Sheffield S10 2TA, UK
    • ,
  • C.W. McLeod

      Affiliations

    • Department of Chemistry, University of Sheffield, UK
    • ,
  • A.G. Cox

      Affiliations

    • Department of Chemistry, University of Sheffield, UK

Received 22 February 2006; received in revised form 11 July 2006; accepted 14 July 2006.

Abstract 

Objectives

The aim of this study was to investigate the effect of hydrogen peroxide (HP) concentration on metal ion release from dental amalgam.

Methods

Dental amalgam discs (n=25) were prepared by packing amalgam into cylindrical plastic moulds (10mm diameter and 2mm height). The discs were divided into five equal groups and each group was immersed in 20ml of either 0%, 1%, 3%, 10% or 30% HP solution for 24h at 37°C. Samples were taken for metal ion release determination (Hg, Ag, Sn and Cu) using inductively coupled plasma mass spectrometry (ICP-MS). The surface roughness of each disc was measured before and after bleaching.

Results

The differences in concentration of metal ions released after treatment with 0% (control) and each of 1%, 3%, 10% and 30% HP were statistically significant (p<0.05). Metal ion release for the elements (Hg, Ag, Sn and Cu) increased with exposure to increasing concentrations of HP. Surface roughness measurements of the samples before and after treatments with HP solutions were not significantly different (p>0.05).

Conclusions

Exposure to HP bleaching agent was associated with increased metal ion released from dental amalgams compared to treatment with a control solution. Ion release was in proportion to the peroxide concentration tested, with the highest concentration associated with the greatest metal ion release for all elements investigated.

Keywords: Tooth bleaching, Hydrogen peroxide, Dental amalgam, Ion release, Surface roughness

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PII: S0300-5712(06)00133-3

doi:10.1016/j.jdent.2006.07.003

Journal of Dentistry
Volume 35, Issue 2 , Pages 172-176, February 2007

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