title: Radiological evaluation of the morphological changes of root canals shaped with ProTaper for hand use and the ProTaper and RaCe rotary instruments.
abstract: This study evaluated, by means of the radiography examination, the occurrence of deviations in the apical third of root canals shaped with hand and rotary instruments. Sixty mandibular human molars were divided into three groups. The root canals in group 1 were instrumented with ProTaper (Dentsply/Maillefer, Ballaigues, Switzerland) for hand use, group 2 with ProTaper and group 3 with RaCe. The images obtained by double superimposition of the pre- and postoperative radiographs were evaluated by two endodontists with the aid of a magnifier-viewer and a fivefold magnifier. Statistical analysis was performed using the Fisher-Freeman-Halton. The instrumentation using the ProTaper for hand use showed 25% of the canals with a deviation in the apical third, as did the ProTaper, while the corresponding figure for the RaCe (FKG Dentaire, La-Chaux-de-Fonds, Switzerland) was 20%, but these results were not statistically significant. There was no correlation between the occurrence of deviations in the apical third and the systems used.
authors.affiliation: Department of Prosthetics and Oral and Facial Surgery, MSc Course in Integrated Clinical Dentistry, Faculty of Dentistry, Federal University of Pernambuco, Recife, Brazil. cmaguiar@ufpe.br
authors.forename: Carlos M
authors.initials: CM
authors.lastname: Aguiar
authors.forename: Andréa C
authors.initials: AC
authors.lastname: Câmara
mesh_terms: D003722:Dental Alloys; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging*; D006801:Humans; D008963:Molar; D009532:Nickel; D011861:Radiography, Dental / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation*; D016369:Smear Layer; D013382:Subtraction Technique; D014025:Titanium; D019227:Tooth Apex / Q000000981:diagnostic imaging*
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium