title: The ultrastructure of black stain on human primary teeth.
mesh_terms: D001419:Bacteria / Q000166:cytology; D002114:Calcinosis; D002648:Child; D003741:Dental Deposits / Q000382:microbiology / Q000473:pathology*; D006801:Humans; D008854:Microscopy, Electron; D013194:Staining and Labeling; D014094:Tooth, Deciduous / Q000382:microbiology / Q000473:pathology*