Three-rooted mandibular molars in patients of Mongolian, Caucasian and Negro origin.

@article{Ferraz1993ThreerootedMM,
  title={Three-rooted mandibular molars in patients of Mongolian, Caucasian and Negro origin.},
  author={Jos{\'e} Antonio Brufato Ferraz and Jesus Djalma P{\'e}cora},
  journal={Brazilian dental journal},
  year={1993},
  volume={3 2},
  pages={113-7}
}
A total of 328 periapical x-rays from 105 patients of Mongolian origin, 106 of Negro origin and 117 of Caucasian origin were studied. The Mongolian race showed a greater incidence of three-rooted mandibular molars (15.2% of the Mongolian patients, 7.5% of the Negro patients and 6.8 of the Caucasian patients). There was no statistical difference in relation to sex and the incidence of this extra root. 
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