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Table 7 The curved regions of mesiodistal and buccolingual directions of the MMCs of the mandibular first molars

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

Age

Direction

Upper 1/3 (P ≤ 0.5)

Middle 1/3 (0.5 < P ≤ 2)

Apical 1/3 (P > 2)

 < 40

Mesiodistal

9 (8.74%)

80 (77.67%)

14 (13.59%)

n = 103

Buccolingual

5 (4.85%)

92 (89.32%)

6 (5.83%)

 ≥ 40

Mesiodistal

2 (3.64%)

53 (96.36%)

0 (0%)

n = 55

Buccolingual

1 (1.82%)

51 (92.73%)

3 (5.45%)

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BMC Oral Health

ISSN: 1472-6831

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