Fig. 1From: Impacts of contracted endodontic cavities compared to traditional endodontic cavities in premolarsa The drill virtually superimposed on the tooth to create straight-line access to the apical third of the root canal. b A schematic of a drill in the tooth model. c A 3D-printed template positioned on the single-rooted premolar model. d Template positioned on the premolar with two dental rootsBack to article page