title: Correlation between remaining length of root canal fillings after immediate post space preparation and coronal leakage.
abstract: The seal provided by root canal fillings after post space preparation was studied using a pressure-driven radioactive tracer assay. The coronal part of root canal fillings was immediately removed, using a hot plugger, to a remaining length of either 3, 5, 7, or 9 mm. Intact root canal fillings of 14 mm served as control. Application of air pressure of 130 mm Hg to the tracer solution drove it through the fillings and into phosphate-buffered saline surrounding the apex. Leakage gradually increased for 28 days, and differences in the leakage through 3 to 9 mm fillings were demonstrated. In a passive system by which an additional group of teeth were tested none of these differences could be detected. It was concluded that: (a) root canal fillings of 3, 5, and 7 mm have an inferior seal, compared with that of an intact filling; (b) the sealing is proportional to the length of the remaining filling; and (c) a passive system is unable to detect these differences, even when conducted for as long as 28 days.
authors.affiliation: Department of Restorative Dentistry, The Goldschleger School of Dental Medicine, Ramat Aviv, Tel Aviv University, Israel.
authors.forename: Z
authors.initials: Z
authors.lastname: Metzger
authors.forename: R
authors.initials: R
authors.lastname: Abramovitz
authors.forename: L
authors.initials: L
authors.lastname: Abramovitz
authors.forename: M
authors.initials: M
authors.lastname: Tagger
mesh_terms: D000704:Analysis of Variance; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification* / Q000175:diagnosis; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D006801:Humans; D007700:Kinetics; D011176:Post and Core Technique; D011312:Pressure; D019275:Radiopharmaceuticals; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation / Q000295:instrumentation; D013499:Surface Properties; D013997:Time Factors; D019227:Tooth Apex / Q000033:anatomy & histology; D014316:Tritium
chemical_list: D019275:Radiopharmaceuticals; D012387:Root Canal Filling Materials; D014316:Tritium