Foreign body in a mandibular permanent molar--a case report.

A thirteen-year-old boy was examined in the Department of Pedodontics during a school-screening programme. On examination the left mandibular first permanent molar was found to be grossly destroyed. On radiographic evaluation a radio opaque screw shaped foreign object was seen in the pulp chamber of the said tooth. Retrieval of the foreign object was tried but the attempt was unsuccessful and an extraction was planned. A case of a unique foreign object in the pulp chamber of the tooth is reported.