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A 37-year-old male patient complains about pain of the 46 tooth during food intake, especially hot food, offensive breath when he sucks his tooth. Objectively: the face is symmetrical, masticatory surface of the 48 tooth has a deep carious cavity communicating with the dental cavity. X-ray picture shows widening of periodontal fissure at the root apex of the 46 tooth. What is the most likely diagnosis?