title: [Experimental study on an apical barrier constructed of synthetic hydroxyapatite].
mesh_terms: D000818:Animals; D003763:Dental Leakage / Q000473:pathology / Q000517:prevention & control; D004285:Dogs; D006801:Humans; D006882:Hydroxyapatites; D012387:Root Canal Filling Materials; D014092:Tooth Root / Q000473:pathology; D015040:Zirconium
chemical_list: D006882:Hydroxyapatites; D012387:Root Canal Filling Materials; D015040:Zirconium; C028541:zirconium oxide