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Table 2 Distribution of apical foramina and deltas of Yemeni permanent maxillary first premolars

From: Root form and canal morphology of maxillary first premolars of a Yemeni population

Features

Single-rooted

n (%)

Double-rooted

n (%)

Three-rooted

n (%)

Total

n (%)

B

P

MB

DB

P

Apical foramen location

 Centrally in the apex

104

(75.9%)

101

(91.0%)

99

(89.2%)

2

(100%)

2

(100%)

2

(100%)

310

(84.9%)

 Laterally

17

(12.4%)

10

(9.0%)

12

(10.8%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

39

(10.7%)

 Both

16

(11.7%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

16

(4.4%)

No. of apical foramina

 One

61

(44.5%)

106 (95.5%)

110

(99.1%)

2 (100%)

2

(100%)

2

(100%)

283

(77.5%)

 Two

66

(48.2%)

5

(4.5%)

1

(0.9%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

72

(19.7%)

 Three

10

(7.3%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

10

(2.8%)

Apical deltas

 Apical delta present

29

(21.2%)

3

(2.7%)

1

(0.9%)

0

(0.0%)

0

(0.0%)

0

(0.0%)

33

(13.2%)

 Apical delta absent

108

(78.8%)

108

(97.3%)

110

(99.1%)

2

(100%)

2

(100%)

2

(100%)

332

(86.8%)