Fig. 1From: Molar root canal treatment performed by undergraduate dental students; an observational study of procedural errors and student perceptionProcedural errors detected in the post-obturation radiographs; (a) under-extension of obturation in the mesio-buccal root of the maxillary right first molar, (b) canal transportation in the mesial root of the mandibular left first molar, (c) separated instrument in the mesio-lingual root of the mandibular left first molar, and (d) Defective coronal restoration in the mandibular right first molarBack to article page