title: Quantitative transportation assessment in curved canals prepared with an off-centered rectangular design system.
abstract: The purpose of this study was to assess the ability of an off-centered rectangular design system [ProTaper Next (PTN)] to maintain the original profile of the root canal anatomy. To this end, ProTaper Universal (PTU), Reciproc (R) and WaveOne (WO) systems were used as reference techniques for comparison. Forty clear resin blocks with simulated curved root canals were randomly assigned to 4 groups (n = 10) according to the instrumentation system used: PTN, PTU, R and WO. Color stereomicroscopic images of each block were taken before and after instrumentation. All image processing and data analysis were performed with an open source program (Fiji v.1.47n). Evaluation of canal transportation was obtained for two independent regions: straight and curved portions. Univariate analysis of variance and Tukey's Honestly Significant Difference test were performed, and a cut-off for significance was set at α = 5%. Instrumentation systems significantly influenced canal transportation (p = 0.000). Overall, R induced significantly lower canal transportation compared with WO, PTN and PTU (p = 0.000). The curved portion displayed superior canal transportation compared to the straight one (p = 0.000). The significance of the difference among instrumentation systems varied according to the canal level evaluated (p = 0.000). In its straight portion, R and WO exhibited significantly lower transportation than PTN; whereas in the curved portion, R produced the lowest deviation. PTU exhibited the highest canal transportation at both levels. It can be concluded that PTN produced less canal transportation than PTU and WO; however, R exhibited better centering ability than PTN.
authors.affiliation: Department of Endodontics, School of Dentistry, Universidade do Grande Rio, Rio de Janeiro, RJ, Brazil.
authors.forename: Emmanuel João Nogueira Leal
authors.initials: EJ
authors.lastname: Silva
authors.affiliation: Department of Endodontics, School of Dentistry, Universidade do Grande Rio, Rio de Janeiro, RJ, Brazil.
authors.forename: Vania Cristina Gomes
authors.initials: VC
authors.lastname: Vieira
authors.affiliation: Department of Endodontics, School of Dentistry, Universidade do Grande Rio, Rio de Janeiro, RJ, Brazil.
authors.forename: Michele Dias Nunes
authors.initials: MD
authors.lastname: Tameirão
authors.affiliation: Department of Endodontics, Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: Felipe Gonçalves
authors.initials: FG
authors.lastname: Belladonna
authors.affiliation: Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Aline de Almeida
authors.initials: Ade A
authors.lastname: Neves
authors.affiliation: Department of Dentistry II, School of Dentistry, Universidade Federal do Maranhão, São Luis, MA, Brazil.
authors.forename: Erick Miranda
authors.initials: EM
authors.lastname: Souza
authors.affiliation: Department of Endodontics, School of Dentistry, Universidade do Grande Rio, Rio de Janeiro, RJ, Brazil.
authors.forename: Gustavo
authors.initials: G
authors.lastname: DE-Deus
mesh_terms: D000704:Analysis of Variance; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D004867:Equipment Design; D007091:Image Processing, Computer-Assisted; D008422:Materials Testing; D008953:Models, Anatomic; D009532:Nickel / Q000737:chemistry; D015203:Reproducibility of Results; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D014025:Titanium / Q000737:chemistry
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium