title: The unpredictability of seal after post space preparation: a fluid transport study.
abstract: A root canal filling remaining after post space preparation is commonly expected to provide adequate seal. Coronal leakage of 30 endodontically treated teeth was measured before post space preparation using a fluid transport assay. In 10 of these teeth post space was prepared, using a two-step procedure, first to a remaining filling of 6 mm and then to 3 mm, with the leakage studied after each step. In 10 teeth the removal was done in one step to a remaining length of 3 mm. The other 10 teeth, with intact root canal fillings, served as controls and were tested twice for leakage. A significant difference was found between the sealing ability of intact fillings and that of partially removed ones (p < 0.05). The difference between the sealing ability of 3 and 6 mm remaining length group was not statistically significant. The lack of statistical differences between the 6 mm and 3 mm fillings was due to a great variability which existed among the 3 mm remaining fillings. These results suggest that 3 to 6 mm fillings provided a seal inferior to that of intact root canal fillings. Reduction of the fillings to 3 mm resulted in an unpredictable seal.
authors.affiliation: Department of Endodontology, Goldschleger School of Dental Medicine, Tel Aviv University, Israel.
authors.forename: L
authors.initials: L
authors.lastname: Abramovitz
authors.forename: R
authors.initials: R
authors.lastname: Lev
authors.forename: Z
authors.initials: Z
authors.lastname: Fuss
authors.forename: Z
authors.initials: Z
authors.lastname: Metzger
mesh_terms: D000704:Analysis of Variance; D001729:Bismuth / Q000737:chemistry; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging; D004338:Drug Combinations; D004853:Epoxy Resins; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D008709:Methenamine / Q000737:chemistry; D011176:Post and Core Technique; D011859:Radiography; D012212:Rheology; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation / Q000295:instrumentation; D012390:Root Canal Therapy; D012834:Silver / Q000737:chemistry; D013223:Statistics as Topic; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D019231:Tooth Preparation, Prosthodontic
chemical_list: D004338:Drug Combinations; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D012834:Silver; C028044:epoxy resin AH-26; D006171:Gutta-Percha; D014025:Titanium; D008709:Methenamine; D001729:Bismuth