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Fig. 4 | BMC Oral Health

Fig. 4

From: Classification and morphology of middle mesial canals of mandibular first molars in a southern Chinese subpopulation: a cone-beam computed tomographic study

Fig. 4

CBCT images of the 3-4-3-2-1 root canal system type. a–e were CT images with different cross sections: This type is more complicated, there are three root canals at the bottom of the pulp chamber, then four branches are branched, and fused into three root canals, then two canals can be seen at apical 1/3 of root canal. The root canals eventually fused into one apical foramen; f–j sagittal images

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