Background: A mandibular first molar with two distal roots is an interesting example of anatomic variation.
Case Presentation: This report describes a case of mandibular first molar with four roots (two mesial and two distal). The canals were shaped with K3 instrument (Sybron Endo, West Collins, CA, USA) and irrigated with 2.5% sodium hypochlorite. The canals were then obturated with gutta-percha and AH 26 sealer.
Conclusion: This case report shows an anatomic variation of external morphology of the tooth. This report presents a successful treatment of a mandibular first molar with four-rooted, two mesial and two distal roots.
Key words: Mandibular first molar, two mesial and two distal root, case report.
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