title: Obturation of root canals by the standardized and step back techniques.
mesh_terms: D002983:Clinical Competence; D001840:Dental Bonding; D003763:Dental Leakage / Q000209:etiology*; D004708:Endodontics / Q000193:education; D006801:Humans; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation; D012390:Root Canal Therapy / Q000379:methods*
chemical_list: D012387:Root Canal Filling Materials