Fig. 1From: The incidence of radicular groove on maxillary lateral incisors of Saudi population: CBCT evaluationIllustration of Gu’s Classification based on the severity. Type I: short groove (not beyond the coronal third of the root). Type II: long and shallow groove (beyond the coronal third of the root). Type III: long and deep groove (beyond the coronal third of the root), associated with complex root canal systemBack to article page