title: In vitro comparative study of manual and mechanical rotary instrumentation of root canals using computed tomography.
abstract: This in vitro study compared, using computed tomography (CT), the amount of dentin removed from root canal walls by manual and mechanical rotary instrumentation techniques. Forty mandibular incisors with dental crown and a single canal were selected. The teeth were randomly assigned to two groups, according to the technique used for root canal preparation: Group I - manual instrumentation with stainless steel files; Group II - mechanical instrumentation with RaCe rotary nickel-titanium instruments. In each tooth, root dentin thickness of the buccal, lingual, mesial and distal surfaces in the apical, middle and cervical thirds of the canal was measured (in mm) using a multislice CT scanner (Siemens Emotion, Duo). Data were stored in the SPSS v. 11.5 and SigmaPlot 2001 v. 7.101 softwares. After crown opening, working length was determined, root canals were instrumented and new CT scans were taken for assessment of root dentin thickness. Pre- and post-instrumentation data were compared and analyzed statistically by ANOVA and Tukey's post-hoc test for significant differences (p=0.05). Based on the findings of this study, it may be concluded that regarding dentin removal from root canal walls during instrumentation, neither of the techniques can be considered more effective than the other.
authors.affiliation: School of Dentistry, Lutheran University of Brazil, Canoas, RS, Brazil.
authors.forename: Orlando
authors.initials: O
authors.lastname: Limongi
authors.forename: Diana Santana
authors.initials: DS
authors.lastname: de Albuquerque
authors.forename: Flares
authors.initials: F
authors.lastname: Baratto Filho
authors.forename: José Roberto
authors.initials: JR
authors.lastname: Vanni
authors.forename: Elias P Motcy
authors.initials: EP
authors.lastname: de Oliveira
authors.forename: Fernando Branco
authors.initials: FB
authors.lastname: Barletta
mesh_terms: D003722:Dental Alloys; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging*; D003804:Dentin / Q000000981:diagnostic imaging; D004867:Equipment Design; D006801:Humans; D008422:Materials Testing; D009532:Nickel; D018915:Root Canal Preparation / Q000295:instrumentation*; D013193:Stainless Steel; D014025:Titanium; D014057:Tomography, X-Ray Computed; D019227:Tooth Apex / Q000000981:diagnostic imaging; D019237:Tooth Cervix / Q000000981:diagnostic imaging
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D014025:Titanium