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Table 4 Cross-sectional c-shaped mandibular second molars at different root levels, according to Fan et. al [5] in female patients

From: Root canal morphology and variations in mandibular second molars: an in vivo cone-beam computed tomography analysis

Root level

C1%

C2%

C3%

C4%

Cervical

27.77

22.22

27.77

22.22

Middle

5.55

27.77

55.55

11.11

apical

5.55

5.55

44.44

44.44