title: Identification of common foreign material in postendodontic granulomas and cysts.
abstract: The present investigation was undertaken to identify commonly occurring foreign material in postendodontic periapical granulomas and cysts. 29 biopsies from such lesions with observed foreign material were routinely processed, stained with H&E, von Kossa and Calcofluor White and investigated by light, polarization and fluorescence microscopy. Applying back-scattered SEM images, the foreign material was subjected to energy dispersive X-ray analysis. 4 groups of foreign material were observed: 1. Black/brownish fragments and yellow/brown granules containing Au, Ag, Cu, Hg, Sn and Zn compatible with amalgam. 2. Fine black/brown/yellow granules compatible with endodontic sealer components revealing Ag, Ba, Bi, Cu, S, Ti and Zn. 3. Basophilic fragments compatible with Ca salts from Ca(OH), extruded periapically and containing Ca and P. 4. Elongated/rounded/oval/kidney-shaped, colourless to slightly basophilic, birefringent structures revealing C and O and with a slit-like central canal and a bright, pale-blue fluorescence specific for cellulose.
authors.affiliation: Dental Faculty, University of Oslo, Norway.
authors.forename: H S
authors.initials: HS
authors.lastname: Koppang
authors.forename: R
authors.initials: R
authors.lastname: Koppang
authors.forename: S O
authors.initials: SO
authors.lastname: Stolen
mesh_terms: D002126:Calcium Hydroxide / Q000009:adverse effects; D003723:Dental Amalgam / Q000009:adverse effects; D004577:Electron Probe Microanalysis; D005547:Foreign Bodies; D006801:Humans; D010484:Periapical Granuloma / Q000209:etiology*; D011842:Radicular Cyst / Q000737:chemistry / Q000209:etiology*; D012387:Root Canal Filling Materials / Q000009:adverse effects; D012390:Root Canal Therapy / Q000009:adverse effects*
chemical_list: D012387:Root Canal Filling Materials; D003723:Dental Amalgam; D002126:Calcium Hydroxide