Middle mesial canal of a mandibular first molar--a case report.
The mandibular first molar usually has only two mesial canals, a mesiolingual and a mesiobuccal. Cases of a third canal described as the middle mesial canal has been reported and is found to be uncommon. In this case report, three canals in the mesial root of a mandibular first molar were located, prepared and filled. The third canal presented as a fin when during instrumentation the instrument could pass freely between the mesiolingual canal and the middle mesial canal.
D000328:Adult; D006801:Humans; D008297:Male; D008334:Mandible; D008963:Molar / Q000002:abnormalities*; D014092:Tooth Root / Q000002:abnormalities*