title: Electron miscroscope study of defect zones in dental enamel.
mesh_terms: D001031:Apatites; D002118:Calcium / Q000502:physiology; D003731:Dental Caries / Q000473:pathology; D003743:Dental Enamel / Q000502:physiology / Q000648:ultrastructure*; D006801:Humans; D007854:Lead / Q000502:physiology
chemical_list: D001031:Apatites; D007854:Lead; D002118:Calcium