Classification and morphology of middle mesial canals of mandibular first molars in a southern Chinese subpopulation: a cone-beam computed tomographic study

Table 5 The distance between the mesiobuccal—middle mesial orifices as well as the mesiolingual—middle mesial orifices

Classification	Improved Vertucci’s classification	MM-MB distance (Mean ± S)		MM-ML distance (Mean ± S)
Classification	Improved Vertucci’s classification	< 40	≥ 40	< 40	≥ 40
Type I	Type VIII	1.55 ± 0.30	1.41 ± 0.25	1.56 ± 0.17	1.32 ± 0.20
Type II	3-2	1.44 ± 0.31	1.40 ± 0.28	1.41 ± 0.25	1.49 ± 0.28
Type VIII	3-2-1*	1.07 ± 0.27	1.01	1.17 ± 0.38	1.21
Type IX	3-2-3-2*	–	1.93 ± 0.04	–	1.49 ± 0.01
Type X	3-4-3-2-1*	1.02	–	1.02	–

*We found that there were three classifications have not been reported by using CBCT

ISSN: 1472-6831