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Diagrammatic representations illustrating the correlation between the developmental root fusion lines (DRFL) on the pulpal floor with the canal orifices in permanent mandibular first molars with varying root and root canal anatomy. (a) A more obtuse angle (α) between the connecting DRFL in teeth with 2 roots, 4 canals. (b) A more acute angle (α 1) between the connecting DRFL in teeth with 4 roots, 4 canals.
