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Treatment considerations of the middle mesial canal of mandibular first and second molars

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      The occurrence, instrumentation, and obturation of the isthmus between the mesiobuccal and mesiolingual canals in mandibular first and second molars were studied in a hundred such molars that were consecutively treated in private practice. Of the one hundred cases, twelve separate middle mesial canals were identified and treated. The morphology of these middle mesial canals was as follows: eight fins, two confluent canals, and two independent canals. The surgical considerations that are necessary for the exposure and retrograde obturation of these cases are also described.
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