Figure 2 | International Journal of Oral Science

Figure 2

From: Incidence of C-shaped root canal systems in mandibular second molars in the native Chinese population by analysis of clinical methods

Figure 2

Classification of the canal configuration of the modified Melton's method. Category C1: the shape is an uninterrupted ‘C’ with no separation or division. Category C2: the canal shape resembles a semicolon resulting from a discontinuation of the ‘C’ outline. Category C3a: two separated canals. Category C3b: three separated canals. Category C4: only one round or oval canal.

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