Study Examination
method
N Occurance
(%)
MIC diameter
(mm)
Obradovic et al. (1993) CS 105 92 in dentate mandibles
31 in edentulous
Range
0.48 - 2.9
Mardinger et al. (2000) CS 46 26 -
Mraiwa et al. (2003) CS 50 96 1.8 (SD 0.5)
Jacobs et al. (2002) CT 230 93 1.1 (SD 0.3)
Jacobs et al. (2004) PR 545 15 -
Uchida et al. (2007) CS 38 100 Range
0.5 – 6.6
Uchida et al. (2009) CS
CBCT
71
4
100
100
Range
1.0 – 6.6
Pires et al. (2009) CBCT
PR
89
89
83
11
Range
0.4 – 4.6

MIC = mandibular incisive canal; CS = cadaver study; PR = panoramic radiographs; CT = computed tomography; CBCT = cone beam computed tomography.