Table 2 Distribution of root Canal configurations of maxillary first premolar teeth according to Vertucci and Ahmed’s classification.

Vertucci classification

 Type I

612

9.3%

602

9.1%

 Type II

676

10.2%

790

12.0%

 Type III

560

8.5%

523

7.9%

 Type IV

3981

60.3%

3751

56.8%

 Type V

394

6.0%

445

6.7%

 Type VI

102

1.5%

106

1.6%

 Type VII

23

0.3%

57

0.9%

 Type VIII

104

1.6%

106

1.6%

 Type X

2

0.0%

6

0.1%

 Type XII

4

0.1%

0

0.0%

 Type XVI

2

0.0%

1

0.0%

 Type XIX

20

0.3%

32

0.5%

 None classification

120

1.8%

181

2.7%

Ahmed et al. classification

 ¹MP¹

612

9.3%

602

9.1%

 ¹MP¹⁻¹⁻²

23

0.3%

21

0.3%

 ¹MP^1–2−1

560

8.5%

523

7.9%

 ¹MP^{1–2−1–2}

23

0.3%

57

0.9%

 ¹MP^{1–2−1–2−1}

18

0.3%

26

0.4%

 ¹MP^{1–2−1–2−1–2}

2

0.0%

1

0.0%

 ¹MP^1–2−2

371

5.6%

424

6.4%

 ¹MP^1–2−3

0

0.0%

3

0.0%

 ¹MP^{1–2−3−2}

2

0.0%

1

0.0%

 ¹MP^{1–2−3−2}

0

0.0%

7

0.1%

 ¹MP^{1–2−3−2−1}

1

0.0%

2

0.0%

 ¹MP^{1–2−3−2−3−1}

0

0.0%

1

0.0%

 ¹MP^{1–3−2−1}

1

0.0%

0

0.0%

 ¹MP²⁻¹⁻¹

442

6.7%

548

8.3%

 ¹MP²⁻¹⁻²

102

1.5%

106

1.6%

 ¹MP^{2−1−2−1}

20

0.3%

32

0.5%

 ¹MP^{2−1−2−1−2}

0

0.0%

3

0.0%

 ¹MP²⁻²⁻¹

234

3.5%

242

3.7%

 ¹MP²

380

5.8%

344

5.2%

 ¹MP²⁻²⁻³

2

0.0%

1

0.0%

 ¹MP^2–3−1

4

0.1%

0

0.0%

 ¹MP^2–3−2

0

0.0%

2

0.0%

 ¹MP^{2–3−2−1}

1

0.0%

0

0.0%

 ¹MP^{3−2−1–2−1}

0

0.0%

1

0.0%

 ²MP B¹ P¹

3601

54.6%

3407

51.6%

 ²MP B¹ P^1–2

1

0.0%

0

0.0%

 ²MP B¹ P^1–2−1

1

0.0%

1

0.0%

 ²MP B¹ P^{1–2−1–2−1}

0

0.0%

1

0.0%

 ²MP B¹ P^2 − 1

0

0.0%

1

0.0%

 ²MP B¹ P^{2 − 1−2−1}

1

0.0%

0

0.0%

 ²MP B^1–2 P¹

5

0.1%

11

0.2%

 ²MP B^1–2−1 P¹

18

0.3%

42

0.6%

 ²MP B^1–2−1 P^1–2−1

0

0.0%

1

0.0%

 ²MP B^1–2-2 P¹

1

0.0%

0

0.0%

 ²MP B^2 − 1 P¹

66

1.0%

76

1.2%

 ²MP B^{2 − 2−1} P¹

0

0.0%

6

0.1%

 ³MP MB¹ DB¹ P¹

104

1.6%

106

1.6%

 ³MP MB¹ DB¹ P^1–2−1

2

0.0%

0

0.0%

 ³MP MB¹ DB^1–2−1 P¹

2

0.0%

0

0.0%

 ³MP MB¹ DB¹ P^2 − 1

0

0.0%

1

0.0%