[Gingival pigmentation caused by dental amalgam. An ultrastructural study]

Area of Science:

• Oral pathology
• Materials science in dentistry
• Biomaterials

Context:

• Dental amalgam restorations are common.
• Gingival pigmentation from amalgam is a recognized phenomenon.
• The precise composition and tissue interaction of these deposits require detailed investigation.

Purpose:

• To conduct an ultrastructural analysis of human gingival biopsies pigmented by dental amalgam.
• To characterize the size, nature, and distribution of metallic particles using microscopy and energy dispersive spectrometry (EDS).
• To investigate potential tissue modifications associated with metallic deposition.

Summary:

• Ultrastructural analysis of pigmented gingiva revealed no mercury.
• Fine silver compound grains (0.01-0.05 microns) were observed, preferentially bound to cellular membranes and extracellular structures.
• Associated tissue modifications in gingival epithelium and connective tissue were noted.

Impact:

• Provides detailed ultrastructural insights into amalgam-related gingival pigmentation.
• Identifies silver compounds as the primary particulate deposit, excluding mercury.
• Highlights potential cellular and tissue-level responses to metallic biomaterial migration.