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1a_Image 1

Mandibular right first molar 34-year nonsurgical endodontic posttreatment of furcal lesion of endodontic origin. 1a. Pretreatment periapical radiograph of furcal radiolucency due to necrotic pulp. Precipitous, though the 3-mm wide, buccal sinus tract suggesting predictable result if root canal system could be cleaned, shaped, and packed in 3 dimensions.