Root Canal Anatomy of Maxillary First Premolar by Microscopic Computed Tomography in a Chinese Adolescent Subpopulation
Table 3
Root canal wall thickness in different levels of maxillary first premolar (mean ± SD, mm, n = 70).
Groups
Cervical third
Middle third
Apical third
Apical foramen
SR1C
B
2.32 ± 0.12,#
2.19 ± 0.23,#
1.76 ± 0.46,#
0.89 ± 0.25
P
2.43 ± 0.44,#
2.36 ± 0.38,#
2.01 ± 0.13,#
0.73 ± 0.19
M
1.52 ± 0.35
1.00 ± 0.12
0.87 ± 0.32
0.66 ± 0.15
D
1.84 ± 0.45
1.12 ± 0.24
0.90 ± 0.35
0.52 ± 0.16
SR2C
Buccal canal
B
2.33 ± 0.32
1.91 ± 0.34
1.37 ± 0.50
0.58 ± 0.12
M
2.08 ± 0.12
1.55 ± 0.16
1.33 ± 0.67
0.57 ± 0.10
D
1.99 ± 0.33
1.68 ± 0.61
1.34 ± 0.43
0.65 ± 0.24
Palatal canal
P
2.53 ± 0.30
1.86 ± 0.36
1.33 ± 0.62
0.37 ± 0.08
M
1.83 ± 0.38
1.67 ± 0.61
1.27 ± 0.33
0.63 ± 0.11
D
1.90 ± 0.17
1.77 ± 0.23
1.17 ± 0.26
0.32 ± 0.09
2R2C
Buccal canal
B
2.21 ± 0.34
1.60 ± 0.60
1.08 ± 0.29
0.47 ± 0.09
P
—
—
0.5 ± 0.13,#
0.3 ± 0.07,#
M
1.75 ± 0.40
1.32 ± 0.53
1.07 ± 0.35
0.49 ± 0.10
D
1.75 ± 0.53
1.46 ± 0.33
1.07 ± 0.33
0.49 ± 0.12
Palatal canal
B
—
—
1.09 ± 0.31
0.64 ± 0.12
P
2.52 ± 0.33,#
1.83 ± 0.31,#
1.10 ± 0.30
0.52 ± 0.15
M
1.49 ± 0.19
1.07 ± 0.35
1.07 ± 0.22
0.52 ± 0.21
D
1.80 ± 0.54
1.15 ± 0.28
1.07 ± 0.18
0.49 ± 0.08
represents vs. corresponding M, ; represents vs. corresponding D, . SR1C, single root with 1 canal; SR2C, single root with 2 canals; 2R2C, 2 roots with 2 canals; B, buccal aspect; P, palatal aspect; M, mesio-aspect; D, distal-aspect.
