Mostly seen on mandibular second molars among Chinese, incidence reported to be 27.5%, but I think it is higher than that. Fused roots, long pulp chamber with a C-shaped orifice are common characteristics. A single ML canal and a long oval extending from MB to D is a the most common configuration. ML canal is usually curved. High tendency to strip perforation due to thin lingual wall. Obturation technique used here is warm vertical. Post should be avoided as well.
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