Study Radiological examination
method
N Bifid
MC
Nortje et al. (1977) PR 3612 0.9
Grover and Lorton (1983) PR 5000 0.08
Langlais et al. (1985) PR 6000 0.95
Sanchis et al. (2003) PR 2012 0.35
Naitoh et al. (2009) CBCT 212 65

MC = mandibular canal; PR = panoramic radiographs; CBCT = cone beam computed tomography.