Thin bluish line around the gingival margin

 # A thin bluish line around the gingival margin is due to the absorption of :
 A. Silver
 B. Mercury
 C. Drugs like tetracycline
 D. Lead

The correct answer is D. lead.

Heavy metals cause gingival pigmentation in areas of inflammation only, where the increased permeability permits the seepage of metal into the surrounding tissue.

Lead Line (Burtonian Line) --- Bluish red or deep blue linear pigmentation in marginal gingiva
Silver (argyria) --- Violet marginal line
Bismuth, arsenic and mercury --- Black marginal line
Mesenteric line --- Delicate, brown or black pigmented non cariogenic plaque found on the enamel at the cervical margin of the tooth

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