lead plumbism
齦邊緣有灰 or 藍色之硫化鉛線 (gingival lead line, Burton's line)
(汞,鉍等也都會有)
7.臨床上牙齦出現淡藍色沉澱線稱為Burton's line,此線常與下列何種金..-阿摩線上測驗