title: Sealing properties of different obturation systems applied over apically fractured rotary nickel-titanium files.
abstract: This study investigated the sealing properties of cold laterally compacted gutta percha and Thermafil applied over different apically fractured rotary nickel-titanium files. Extracted human premolars were prepared by using ProTaper (Dentsply-Maillefer, Ballaigues, Switzerland) or ProFile (Dentsply-Maillefer) systems (n = 40 for each), after which half of the specimens in each subgroup were subjected to instrument separation at the apical level. For each rotary system, roots with and without apically separated instruments (n = 10 for each) were filled with the two obturation systems and the levels of fluid conductance were recorded. In the absence of instrument separation, the leakage of Thermafil (Dentsply Maillefer) was significantly less than that achieved with cold lateral compaction (p < 0.05), whereas Thermafil yielded similar amounts of leakage in roots prepared with the ProTaper and ProFile systems (p < 0.05). Roots with fractured ProTaper instruments displayed significantly less leakage than those filled without ProTaper fragments, regardless of the obturation technique used (p < 0.05). However, intracanal separation of ProFile instruments increased the leakage (p < 0.05), but the obturation method did not influence fluid conduction (p > 0.05). These results reveal the variability of leakage associated with apically fractured ProFile and ProTaper files and different obturation methods used.
authors.affiliation: Department of Endodontics, Hacettepe University, Ankara,Turkey. altundassar@gmail.com
authors.forename: Emre
authors.initials: E
authors.lastname: Altundasar
authors.forename: Cem
authors.initials: C
authors.lastname: Sahin
authors.forename: Bahar
authors.initials: B
authors.lastname: Ozcelik
authors.forename: Zafer C
authors.initials: ZC
authors.lastname: Cehreli
mesh_terms: D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification; D003786:Dental Pulp Cavity; D004853:Epoxy Resins / Q000737:chemistry; D004868:Equipment Failure; D005547:Foreign Bodies; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D009532:Nickel / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods*; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D013696:Temperature; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D019227:Tooth Apex; D014867:Water / Q000737:chemistry
chemical_list: D003722:Dental Alloys; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; D014867:Water; C040654:titanium nickelide; D009532:Nickel; D006171:Gutta-Percha; D014025:Titanium