title: The effects on the periapical tissues of bacterial contamination of the filled root canal.
mesh_terms: D000818:Animals; D001419:Bacteria / Q000166:cytology*; D018407:Bacterial Physiological Phenomena; D003786:Dental Pulp Cavity / Q000382:microbiology*; D004285:Dogs; D010485:Periapical Periodontitis / Q000209:etiology*; D012389:Root Canal Obturation / Q000379:methods*