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. 2010 Apr 1;1(1):e2. doi: 10.5037/jomr.2010.1102

Figure 1.

Figure 1

Panoramic radiographs showing different anatomic configurations (I) and position in the vertical plane (II) of the mandibular canal (MC).

I. Classification by Anderson et al. [16]: A = a steep ascent from anterior to posterior; B = a gentle, progressive curve rising from anterior to posterior; C and D = a catenary-like canal.

II. Classification by Nortje et al. [18]: A = a high MC (within 2 mm of the apices of the first and second molars); B = an intermediate MC; C = a low MC; D = other variations (duplication or division of the MC, apparent partial or complete absence of the canal or lack of symmetry).