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The morphology of maxillary molars has been extensively studied, particularly the prevalence of a second mesiobuccal (MB2) root canal. Despite of this effort, the high failure rate of root canal treated maxillary molars remains tightly associated with untreated MB2 canals. There is a significant increase in the incidence of MB2 canals in retreatment cases, suggesting that these canals are frequently missed in the initial treatment [1]. Moreover, maxillary 1st Crimson Publishers Wings to the Research Research Article
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I‐Ping Chen (2020) studied this question.
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