title: Presence of Voids after Continuous Wave of Condensation and Single-cone Obturation in Mandibular Molars: A Micro-computed Tomography Analysis.
abstract: BACKGROUND
  The objective of this study was to assess the presence of voids in mesial root canals of mandibular molar teeth obturated by using the single-cone (SC) and continuous wave of condensation (CWC) obturation techniques, and results were analyzed by using micro-computed tomography.
  
  
  METHODS
  Twenty-four mandibular molars with fully developed roots and mesial root curvature ranging from 25° to 35° were instrumented by using Reciproc R25 files, and then they were obturated by using the SC and CWC techniques. Specimens were scanned before and after obturation for micro-computed tomography analysis (voxel size, 17.42 μm). After volumetric analysis and tridimensional reconstruction of the root canals, data were analyzed by using analysis of variance and the Tukey test.
  
  
  RESULTS
  No significant differences were observed between the 2 techniques in terms of total percentage volume of voids: CWC = 3.91% ± 0.72%; SC = 6.52% ± 1.16% (P > .05). Only in the cervical third, CWC showed a significantly lower percentage of voids when compared with SC, namely 2.86% ± 0.94% vs 8.00% ± 1.86%, respectively (P < .05).
  
  
  CONCLUSIONS
  The percentage volume of voids was similar in the 2 groups and was influenced by the obturation technique only in the cervical third.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: Elaine Faga
authors.initials: EF
authors.lastname: Iglecias
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: Laila Gonzales
authors.initials: LG
authors.lastname: Freire
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: George Táccio
authors.initials: GT
authors.lastname: de Miranda Candeiro
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Dos Santos
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: João Humberto
authors.initials: JH
authors.lastname: Antoniazzi
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil. Electronic address: ggavini@usp.br.
authors.forename: Giulio
authors.initials: G
authors.lastname: Gavini
mesh_terms: D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D008334:Mandible; D008963:Molar / Q000000981:diagnostic imaging / Q000601:surgery; D011861:Radiography, Dental / Q000379:methods; D012389:Root Canal Obturation / Q000009:adverse effects / Q000379:methods*; D055114:X-Ray Microtomography / Q000379:methods
keywords: Micro-computed tomography; obturation techniques; root canal filling; voids