Table 2 Number of roots of mandibular permanent molars in a sample of 332 teeth.

From: Root and root canal morphology of mandibular first and second molars in a Jordanian subpopulation: a cross-sectional cone-beam computed tomography study

Tooth

No. of teeth

Number of roots (%, CI)

One

Two

Three

Four

36

78

0 (0)

75 (96.2, 89.4–99.2)

3 (3.8, 0.8–10.6)

0 (0)

37

81

7 (8.6, 3.5–17.1)

70 (86.4, 77.0–92.9)

4 (4.9, 1.4–12.0)

0 (0)

46

81

1 (1.2, 0.03–6.6)

78 (96.3, 89.6–99.2)

2 (2.5, 0.3–8.7)

0 (0)

47

92

10 (10.9, 5.4–19.1)

77 (83.7, 74.7–90.6)

2 (2.2, 0.3–7.8)

3 (3.3, 0.7–9.3)

Total

332

18 (5.4, 3.2–8.5)

300 (90.4, 86.8–93.3)

11 (3.3%, 1.7–5.9)

3 (0.9, 0.2–2.7)

  1. CI confidence interval.
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