Table 1. Prevalence of supernumerary root in mandibular first molar.
| Author/reference | Origin | Incidence (%) | Evaluation method |
|---|---|---|---|
| Curzon and Curzon [4] | Mongoloid Keewatin Eskimo (Canada) | 27 | In vitro (extracted teeth) |
| Reichart and Metah [5] | Thai (Thailand) | 19.2 | In vitro (extracted teeth) |
| Walker [6] | Chinese (Hong Kong) | 15 | In vitro (extracted teeth) |
| Younes et al. [7] | African (Egypt) | 0.7 | In vitro (extracted teeth) |
| Asian (Saudi Arabia) | 2.3 | ||
| Zaatar et al. [8] | Kuwait | 2.7 | In vivo (periapical radiographs) |
| Sperber and Moreau [9] | Senegal | 3.1 | In vitro (extracted teeth) |
| Al-Nazhan [10] | Saudi Arabia | 5.97 | In vivo (periapical radiographs) |
| Ahmed et al. [11] | Sudan | 3 | In vitro (extracted teeth) |
| Schäfer et al. [12] | Germany | 0.7 | In vivo (periapical radiographs) |
| Al-Qudah and Awawdeh [13] | Jordan | 3.9 | In vitro (extracted teeth) |
| Song et al. [14] | Korea (Mongoloid origin) | 33.1 | In vivo (periapical radiographs) |
| Zhang et al. [15] | China | 29 | In vivo (CBCT) |
| Demirbuga et al. [16] | Turkey | 2.06 | In vivo (CBCT) |
| Mukhaimer and Azizi [17] | Palestine | 3.73 | In vivo (periapical radiographs) |
| Rodrigues et al. [18] | Brazil | 2.58 | In vivo (CBCT) |
| Rahimi et al. [19] | Iran | 3.00 | In vivo (CBCT) |
| Gupta et al. [20] | Haryana (North India) | 13.00 | In vivo (periapical radiographs and CBCT) |
CBCT, cone-beam computed tomography.