title: Micro-CT Evaluation of Non-instrumented Canal Areas with Different Enlargements Performed by NiTi Systems.
abstract: The aim of this study was to compare the percentage of non-instrumented area of root canals prepared with different enlargements using single-file reciprocating systems (Reciproc and WaveOne) and a conventional multi-file rotary (BioRaCe) system by micro-computed tomographic analysis. Thirty mesial roots of mandibular molars with moderate curvature (10° to 20°) presenting a type II Vertucci canal configuration and similar internal volume were chosen and scanned at an isotropic resolution of 14.16 µm. The sample was assigned to 3 groups (n=10) according to the system used for root canal preparation: Reciproc, WaveOne, and BioRaCe groups. Second and third scans were taken after the canals were prepared with instruments sizes 25 and 40, respectively. The recorded images of the surface area voxels of the canals, before and after preparation were examined from the furcation level to the apex to quantify the non-instrumented surface. Statistical data were compared using GLM for repeated-measures with a significance level set at 5%. Instrumentation systems did not influence the percentage of untouched root canal surfaces (p=0.690) whilst a significant reduction in the percentage of static voxels was observed after the enlargement of the root canal (p=0.010) in all groups (p=0.507). None of the systems was able to prepare the entire surface area of the mesial root canal of mandibular molars. The increased final apical size resulted in a significant positive effect on the shaping ability of the tested systems.
authors.affiliation: Department of Endodontics, UNIGRANRIO - Universidade Grande Rio, Duque de Caxias, RJ, Brazil.
authors.forename: Gustavo
authors.initials: G
authors.lastname: De-Deus
authors.affiliation: Department of Endodontics, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: Felipe Gonçalves
authors.initials: FG
authors.lastname: Belladonna
authors.affiliation: Department of Endodontics, UNIGRANRIO - Universidade Grande Rio, Duque de Caxias, RJ, Brazil.
authors.forename: Emmanuel João Nogueira Leal
authors.initials: EJ
authors.lastname: Silva
authors.affiliation: Department of Endodontics, UNIGRANRIO - Universidade Grande Rio, Duque de Caxias, RJ, Brazil.
authors.forename: Juliana Roter
authors.initials: JR
authors.lastname: Marins
authors.affiliation: Department of Dentistry II, UFMA - Universidade Federal do Maranhão, São Luiz, MA, Brazil.
authors.forename: Erick Miranda
authors.initials: EM
authors.lastname: Souza
authors.affiliation: Department of Endodontics, UNIGRANRIO - Universidade Grande Rio, Duque de Caxias, RJ, Brazil.
authors.forename: Renata
authors.initials: R
authors.lastname: Perez
authors.affiliation: Nuclear Engineering Program, UFRJ - Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Ricardo Tadeu
authors.initials: RT
authors.lastname: Lopes
authors.affiliation: Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, USP - Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Marco Aurélio
authors.initials: MA
authors.lastname: Versiani
authors.affiliation: Department of Material Engineering, PUC-RIO - Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Sidnei
authors.initials: S
authors.lastname: Paciornik
authors.affiliation: Department of Pediatric Dentistry and Orthodontics, UFRJ - Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Aline de Almeida
authors.initials: Ade A
authors.lastname: Neves
mesh_terms: D000497:Alloys; D006801:Humans; D018915:Root Canal Preparation; D055114:X-Ray Microtomography / Q000379:methods*
chemical_list: D000497:Alloys; C013616:nitinol