Table 7 Summary of main canal configuration results in mandibular first molar

Gu et al. [12]

Whole tooth (25)

Chinese

Vertucci

Type I 8%

Type II 12%

Type IV 64%

Type V 8%

Type I 72%

Type II 4%

Type IV 4%

Type V 4%

Harris et al. [52]

Whole tooth

(22)

Minnesota, USA

Vertucci

Type I 9.09%

Type II 0%

Type III 4.54%

Type IV 4.54%

Type V 27.27%

Type VI 9.09%

Type VII 4.54%

Type VIII 0%

Type I 81%

Type II 0%

Type III 4.54%

Type IV 0%

Type V 4.54%

Type VI 0%

Type V 4.54%

Type VIII 0%

18% of MRs

Filpo-Perez et al. [5]

DR

(100)

Brazilian

Vertucci

Type I 76%

Type II 3%

Type IV 1%

Type V 7%

13%

Lamia & McDonald [53]

MR

(114)

N/A

Vertucci

Type IV only 50.8%

Wolf et al. [57]

Whole tooth

(118)

Egyptian

Four-digits

2–2-2/2 31.4%

2–2-1/1

15.3%

2–2-2/3

11.9%

2–2-1/2

7.6%

Others 0.8- 4.2%

1–1-1/1 58.5%

1–1-1/2 10.2%

1–1-2/2 4.2%

1–1-1/3 3.4%

Marceliano-Alves et al. [7]

MR

(104)

Brazilian

Vertucci

Type I 11.5%

Type II 16.3%

Type III 5.8%

Type IV 46.2%

Type V 2.9%

Type VI 8.7%

Type VII 1%

Type VIII 7.7%