title: Evaluation and repair of root canal failures.
mesh_terms: D006171:Gutta-Percha; D006801:Humans; D011176:Post and Core Technique; D012184:Retrograde Obturation / Q000592:standards; D012389:Root Canal Obturation / Q000592:standards*; D012390:Root Canal Therapy; D012834:Silver
chemical_list: D012834:Silver; D006171:Gutta-Percha