title: Shaping ability of RaCe rotary nickel-titanium instruments in simulated root canals.
abstract: This study assessed the shaping ability of RaCe rotary nickel-titanium instruments in simulated root canals. Forty simulated root canals consisting of four different shapes were prepared with RaCe rotary nickel-titanium instruments in a crowndown approach. Preoperative images were taken at the outset and postoperative images at various stages of preparation including at the conclusion of the shaping procedure. The combined images enabled assessment of aberrations and resin removal at various positions along the canal length. Overall, mean preparation time to size 40, .02 taper was 1.36 min. Thirty-three canals (83%) maintained the working length, three instruments deformed and no zips, perforations, or ledges were created. Under the conditions of this study RaCe rotary nickel-titanium instruments prepared simulated canals rapidly and successfully, with little change in working length and with few aberrations or instrument deformities.
authors.affiliation: College of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: Samantha
authors.initials: S
authors.lastname: Rangel
authors.forename: Renato
authors.initials: R
authors.lastname: Cremonese
authors.forename: Susan
authors.initials: S
authors.lastname: Bryant
authors.forename: Paul
authors.initials: P
authors.lastname: Dummer
mesh_terms: D003722:Dental Alloys; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D004867:Equipment Design; D006801:Humans; D003765:Models, Dental; D009532:Nickel; D009811:Odontometry; D018915:Root Canal Preparation / Q000295:instrumentation*; D013997:Time Factors; D014025:Titanium
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium