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This study evaluated the precision of a simplified workflow using only preoperative cone-beam computed tomographic (CBCT) scans to gain guided access to rootcanals of extracted mandibular molars. A workflow using CBCT scanning associated with3-dimensional oral scanning was used as a reference for comparison. The influence ofthepresence of coronal restoration in the simplified workflow was also evaluated. Forty-five mandibular molars were randomized into 3 groups a control group in which digital planning was performed with CBCT and oral