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Table 5 Number frequency and root canal configurations at orifice cross-sectional lever of C-shaped root canals in mandibular second molars by gender and age (N = 430)

From: Variations of root and canal morphology of mandibular second molars in Chinese individuals: a cone-beam computed tomography study

Canal configuration n (%)

Gender

Age

Total

Female

(n = 600)

Male

(n = 600)

15–24

(n = 400)

25–34

(n = 220)

35–44

(n = 180)

45–54

(n = 260)

 ≥ 55

(n = 140)

C1 canal

55 (21.6)

44 (25.1)

49 (31.4)

14 (21.5)

12 (20.6)

20 (20.4)

4 (7.54)

99 (23.1)

C2 canal

87 (34.1)

64 (36.6)

60 (38.4)

24 (36.9)

14 (24.1)

36 (36.7)

17 (32.1)

151 (35.1)

C3 canal

113 (44.3)

67 (38.3)

47 (30.1)

27 (41.5)

32 (55.1)

42 (42.8)

32 (60.3)

180 (41.8)

Total of C-shaped root canals

255* (42.5)

175* (29.1)

156§ (39)

65§ (29.5)

58§(32.2)

98§(37.7)

53§(37.8)

430

  1. By chi-square test: *P = 0.000; § P = 0.126