Surface analysis of nickel-chromium dental alloys

Dent Mater. 1993 Jul;9(4):252-9. doi: 10.1016/0109-5641(93)90070-7.

Abstract

In this study, the surface compositions of four commercially available nickel-chromium alloys, Neptune, Rexalloy, Regalloy T, and Vera Bond, were compared and correlated to the alloys' corrosion behavior. The alloys were chosen to be representative of alloys with acceptable and unacceptable Cr levels, with and without Be additions. The results showed that the non-Be-containing alloys exhibited a homogeneous Cr-Mo oxide surface which resulted in more corrosion resistant alloys. The Be-containing alloys were shown to have non-uniform oxide surfaces. Areas on the surfaces of these alloys were low in Cr and O and enriched in Be. The oxide surfaces of these alloys were more easily disrupted and provided little resistance to accelerated corrosion processes. Thus, it was found that not only were the Cr and Mo content of the alloys important for corrosion resistance, but the composition of the surface oxide as well.

Publication types

  • Comparative Study
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aluminum / chemistry
  • Beryllium / chemistry
  • Chromium Alloys / chemistry*
  • Corrosion
  • Gallium / chemistry
  • Iron / chemistry
  • Molybdenum / chemistry
  • Nickel / chemistry
  • Niobium / chemistry
  • Surface Properties

Substances

  • Chromium Alloys
  • Niobium
  • Nickel
  • Molybdenum
  • Gallium
  • Aluminum
  • Iron
  • Beryllium