title: Comparison of generated forces and apical microleakage using nickel-titanium and stainless steel finger spreaders in curved canals.
abstract: The purpose of this study was to compare (a) forces generated during lateral compaction and (b) apical microleakage for nickel-titanium (NiTi) and stainless steel (SS) finger spreaders. Twenty-eight extracted human teeth were instrumented using a standardized rotary instrumentation technique. NiTi and SS #30 spreaders were used to obturate molar roots while the forces generated during obturation were measured on a Universal testing machine. Apical microleakage was determined using a fluid filtration method. There was no significant difference in microleakage between spreaders. NiTi spreaders produced significantly less force than SS spreaders in all specimens (p < 0.001).
authors.affiliation: Department of Endodontics, Naval Postgraduate Dental School, Bethesda, MD, USA.
authors.forename: Saman R
authors.initials: SR
authors.lastname: Gharai
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Thorpe
authors.forename: James M
authors.initials: JM
authors.lastname: Strother
authors.forename: Scott B
authors.initials: SB
authors.lastname: McClanahan
mesh_terms: D003722:Dental Alloys; D003762:Dental Instruments / Q000009:adverse effects; D003763:Dental Leakage / Q000209:etiology*; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D009532:Nickel; D012389:Root Canal Obturation / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods; D013193:Stainless Steel; D014025:Titanium; D019227:Tooth Apex
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D014025:Titanium