Table 12 Summary of accessory canals results in mandibular first molar

Gu et al. [12]

Whole tooth (25)

MR (91.4%)

DR (80%)

MR (4.3%)

DR (12%)

MR (4.3%)

DR (8%)

In MR 44%

In DR 76%

Wolf et al. [57]

Whole tooth

(118)

22.9% MB had (1–4)

28% ML had (1–3)

24.7% DL had (1–4)

3.4% DB had ONLY 1 AC

18.6% and 33.9% of MB and ML had at least 1(1–3)

4.2% of DL had only 1

4.2% of DL had (1–2) AC

14.3% MB had (1–3)

10.1% ML had (1–3)

4.2% DL had (1–2)

100% DB had no AC

Moe et al. [60]

(MR (75)

The range of lateral canals was 0–5 in MB canal, 0–3 ML, 0–3 from the isthmuses and 0–2 in MMCs

(80%)

Marceliano-Alves et al. [7]

MR(104)

20.2%,

19.2%

13.5%

Asijaviciene et al. [66]

Whole tooth

(60)

MR (69.57%),

DR (90.32%) Total = 76%

MR (15.24%),

DR (9.68%)

Total = 14%

MR (14.49%), DR (0%)

Total = 10%

Keles et al. [24]

MR with bifid apex

(30)

Patent = 43

Loop = 0

Not studied

Not studied

Anastomosis (3)

MR with non-bifid apex (30)

Patent = 23

Loop = 1

Not studied

Not studied

Anastomosis

(5)