Fig. 4From: Mandibular incisors with two canals are associated with the presence of the distolingual root in mandibular first molars: a cone-beam computed tomographic studyAccess cavity form (solid line) according to mesio-lingual canal orifice–disto-lingual canal orifice–disto-buccal canal (ML–DL–DB) orifice (dotted line). A Without disto-lingual root. B With disto-lingual rootBack to article page