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Comparison of the vertical relationships between the mental foramen (MF) and root apices of the lower premolars in relation to gender of the patients (male [M]/female [F]). 1: MF was located above the level of the apices of the first and second mandibular premolar teeth, 2: MF was located at the level of the apices of the first and second mandibular premolar teeth, and 3: MF was located below the level of the apices of the first and second mandibular premolar teeth.
