Acute pulpitis was diagnosed in tooth 24 of a forty-six-year-old man. The radiograph showed the palatal canal but the buccal canal cannot be detected. Infiltration anesthesia was applied and pulp chamber was perforated with a high speed diamond with water cooling. The pulp chamber floor was examined using fiber optics, probe and small K-files. One large buccal canal opening was detected which deeper ramificated into two buccal canals.

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