title: Comparative analysis of curved root canal preparation using nickel-titanium instruments with or without EDTA.
abstract: The purpose of this study was to examine the effect of the use of EDTA as a root canal irrigant in curved root canals instrumented with nickel-titanium (Ni-Ti) instruments. Twenty extracted maxillary molars were selected. Mesiobuccal roots were used. Teeth were mounted in self-curing acrylic resin bases to allow standardized angulation of the initial and final radiographs. The preinstrumentation radiographs were made with a #15 file in the canal. The canals were instrumented with Ni-Ti instruments by the step-back technique, using or not using EDTA. The post-instrumentation radiographs were made with a #30 file in the canal. The films were projected (x10 magnification), drawn, and superimposed. Ni-Ti instruments used with EDTA were less effective in maintaining the original path of curved canals.
authors.affiliation: Department of Endodontics, University of São Paulo, São Paulo, Brazil.
authors.forename: C M
authors.initials: CM
authors.lastname: Bramante
authors.forename: L V
authors.initials: LV
authors.lastname: Betti
mesh_terms: D002614:Chelating Agents / Q000627:therapeutic use*; D003722:Dental Alloys; D003786:Dental Pulp Cavity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000187:drug effects; D004492:Edetic Acid / Q000627:therapeutic use*; D004867:Equipment Design; D006801:Humans; D008963:Molar / Q000000981:diagnostic imaging; D009532:Nickel; D011858:Radiographic Magnification; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D013223:Statistics as Topic; D013499:Surface Properties; D014025:Titanium; D019227:Tooth Apex / Q000000981:diagnostic imaging; D019237:Tooth Cervix / Q000000981:diagnostic imaging; D014092:Tooth Root / Q000000981:diagnostic imaging
chemical_list: D002614:Chelating Agents; D003722:Dental Alloys; D012388:Root Canal Irrigants; C040654:titanium nickelide; D009532:Nickel; D004492:Edetic Acid; D014025:Titanium