Abstract
This clinical report describes treatment of a patient with gingival pigmentation after the restoration of the right maxillary canine and first premolar with Ni-Cr–based metal ceramic crowns and investigation of mechanisms of gingival discoloration. Histopathological observation and energy dispersive x-ray spectroscopy analysis of the retrieved pigmented gingiva revealed brown deposits both in the epithelial cells and along the basement membranes but no trace of Ni or Cr elements in the pigmented particles, indicating that the gingival pigmentation adjacent to the Ni-Cr–based metal ceramic prosthesis may not be caused by direct deposition of the released ions.
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