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Gingival pigmentation beneath a metallic crown: light and electron microscopic observations and energy dispersive X‐ray analysis.
Author(s) -
Sakai T.,
Sakai H.,
Hashimoto N.,
Hirayasu R.
Publication year - 1988
Publication title -
journal of oral pathology and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 83
eISSN - 1600-0714
pISSN - 0904-2512
DOI - 10.1111/j.1600-0714.1988.tb01306.x
Subject(s) - melanin , pigment , pathology , chemistry , deposition (geology) , layer (electronics) , metal , basement membrane , ground substance , biophysics , materials science , anatomy , biology , medicine , composite material , metallurgy , biochemistry , connective tissue , organic chemistry , sediment , paleontology
Light and electron microscopic studies and energy dispersive X‐ray analysis disclosed that the essential cause of gingival discoloration following the placement of a metallic crown, was marked deposition of melanin pigment. Deposition of melanin pigment was observed in epithelial cells, on basement membranes, and in fibroblasts, macrophages and among intercellular ground substance of the proprial layer. Brown or dark brown colored granules were observed in the deep portion of the proprial layer. Some metallic elements as silver and sulfur were detected. It was presumed that these materials were dental metals accidentally implanted in gingival tissues during the therapeutic procedure. The deposition of melanin pigment closely corresponded with mucosal tissue where these materials were present in the deep portion of the proprial layer. These findings suggested that these materials influenced the physiological metabolism of melanin and induced its pathological deposition in the proprial tissue.