Table 2 Summary of mandibular second premolars studies recording gender differences
From: Root canal morphology of the mandibular second premolar: a systematic review and meta-analysis
Report | PP | n | Met | RCC-frequency (%) | Roots (n; %) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
RCC | Ve (1984) | I | II | III | IV | V | VI | VII | VIII | * | 1 | 2 | 3 | ||
We (1969) | I | II | III | * | |||||||||||
Br (2015) | 1–1–1/1 | 2–2–1/1 | 1–2–1/1 | 2–2–2/2 | 1–1–2/2 | 2–1–2/2 | 1–2–1/2 | 1–1–3/3 | * | ||||||
Sert and Bayirli [36] Comp | TUR | 100 | Cl; In M | 57.0 | 7.0 | 7.0 | 18.0 | 6.0 | 3.0 | 2.0 | 0 | 0 | – | – | – |
100 | F | 85.0 | 7.0 | 0 | 0 | 8.0 | 0 | 0 | 0 | 0 | – | – | – | ||
Hajihassani et al. [15] Comp | IRN | 57 | CBCT M | 74.7 | 4.7 | 16.3 | 0 | 4.7 | 0 | 0 | 0 | 0 | 100 | 0 | 0 |
43 | F | 80.7 | 1.8 | 7.0 | 0 | 8.8 | 1.8 | 0 | 0 | 0 | 100 | 0 | 0 | ||
Martins et al. [22] Comp | PRT | 331 | CBCT M | 94.3 | 0.6 | 2.1 | 0.6 | 1.5 | 0 | 0 | 0 | 0.9 | 99.7 | 0.3 | 0 |
527 | F | 96.6 | 0.9 | 0.8 | 0.4 | 1.3 | 0 | 0 | 0 | 0 | 100 | 0 | 0 | ||
Alfawaz et al. [2] Comp | SAU | 172 | CBCT M | 90.1 | 5.3 | 0.6 | 3.5 | 0.6 | 0 | 0 | 0 | 0 | 95.9 | 4.1 | 0 |
171 | F | 90.1 | 3.5 | 0 | 1.7 | 1.2 | 0 | 0 | 3.5 | 0 | 95.3 | 3.5 | 1.2 | ||
Mashyakhy and Gambarini [24] Comp | SAU | 188 | CBCT M | 94.7 | 0 | 2.7 | 0 | 1.6 | 0 | 0 | 0 | 1.1 | 100 | 0 | 0 |
191 | F | 99.0 | 0 | 0.5 | 0 | 0 | 0 | 0 | 0 | 0.5 | 100 | 0 | 0 | ||
Rajakeerthi and Nivedhitha [33] Comp | IND | 114 | CBCT M | 55.3 | 8.8 | 6.1 | 4.4 | 15.8 | 3.5 | 1.8 | 4.4 | 0 | 89.5 | 7 | 3.5 |
86 | F | 57.0 | 7.0 | 8.1 | 5.8 | 9.3 | 2.3 | 5.8 | 4.7 | 0 | 90.7 | 5.8 | 3.5 | ||
Shemesh et al. [47] | ISR | M 831 | CBCT | 96.4 | 0.6 | 1.7 | 0.1 | 0.6 | 0 | 0 | 0.1 | 0.5 | 99.5 | 0.5 | – |
F 847 | 97.6 | 0.1 | 1.1 | 0.5 | 0 | 0 | 0.3 | 0.2 | 99.8 | 0.2 | – | ||||
Total | - | 3996 | M | 82,2 | 3,4 | 4,9 | 3,3 | 4,1 | 0,8 | 0,5 | 0,6 | 0,5 | 97,8 | 1,7 | 0,6 |
F | 88,1 | 2,5 | 2,3 | 1,1 | 3,6 | 0,5 | 0,7 | 1,1 | 0,2 | 98,0 | 1,6 | 0,9 | |||
Total | 85.1 | 3.0 | 3.6 | 2.3 | 3.8 | 0.7 | 0.6 | 0.8 | 0.3 | 97.9 | 1.6 | 0.7 | |||