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A) Calculating the tooth length in panoramic view; B) Fused distobuccal and palatal roots; yellow arrow denotes fusion in axial plane, and green one denotes fusion in coronal plane; C) A maxillary first molar with 3 separate roots; red arrow denotes second mesiobuccal canal in axial plane; Blue arrow denotes additional canal in palatal root, type V of Vertucci’s classification
