Root Canal Anatomy of Maxillary First Premolar by Microscopic Computed Tomography in a Chinese Adolescent Subpopulation
Table 2
Root diameters in different levels of the three maxillary first premolars (mean ± SD, mm, n = 70).
Groups
Cervical third
Middle third
Apical third
Apical foramen
SR1C
BP
8.02 ± 2.73
6.78 ± 3.04
4.98 ± 2.89
2.23 ± 0.45
1/3 BP
2.67 ± 0.91
2.26 ± 1.01
1.66 ± 0.96
0.74 ± 0.15
MD
4.14 ± 0.13
2.61 ± 1.11
2.13 ± 0.73
1.46 ± 0.67
1/3 MD
1.47 ± 0.04
0.87 ± 0.37
0.71 ± 0.24
0.49 ± 0.22
SR2C
BP
8.91 ± 2.68
8.20 ± 2.71
7.30 ± 1.55
2.10 ± 0.55
1/3 BP
2.97 ± 0.89
6.73 ± 0.90
2.43 ± 0.31
0.70 ± 0.18
MD (buccal)
5.83 ± 1.89
4.17 ± 1.93
3.28 ± 0.87
1.86 ± 0.13
1/3 MD (buccal)
1.94 ± 0.63
1.39 ± 0.64
1.09 ± 0.29
0.62 ± 0.04
MD (palatal)
5.67 ± 2.33
4.01 ± 0.83
2.75 ± 0.35
1.85 ± 0.33
1/3 MD (palatal)
1.89 ± 0.78
1.34 ± 0.27
0.90 ± 0.11
0.61 ± 0.11
2R2C
Buccal roots
BP
8.84 ± 3.00
8.24 ± 3.12
2.61 ± 0.54
1.30 ± 0.34
1/3 BP
2.95 ± 1.00
3.74 ± 1.04
0.87 ± 0.18
0.44 ± 0.11
MD
4.62 ± 1.01
3.74 ± 1.13
2.90 ± 0.59
1.33 ± 0.31
1/3 MD
1.54 ± 0.34
1.24 ± 0.37
0.97 ± 0.19
0.44 ± 0.10
Palatal roots
BP
8.84 ± 3.35
8.24 ± 3.41
2.93 ± 0.71
1.80 ± 0.21
1/3 BP
2.95 ± 1.12
3.74 ± 1.13
0.98 ± 0.23
0.60 ± 0.07
MD
4.44 ± 1.11
3.22 ± 0.57
2.68 ± 0.48
1.46 ± 0.32
1/3 MD
1.48 ± 0.37
1.41 ± 0.19
0.90 ± 0.16
0.49 ± 0.11
SR1C, single root with 1 canal; SR2C, single root with 2 canals; 2R2C, 2 roots with 2 canals; BP, buccal and palatal diameters; MD, mesiodistal diameter.
