title: Apical debris removal of CanalBrushes with different tip modifications.
abstract: OBJECTIVE
  In this study the apical debris score regarding the rotary use of the CanalBrush (Coltène-Whaledent) with three different tip variations was compared to that of sole needle irrigation.
  
  
  METHODS
  Sixty straight roots of human teeth with one canal were instrumented to size 45/.04. Roots were split into halves, reassembled, and embedded in model resin to form separable tooth models. Artificially manufactured dentin debris was packed into the apical 2 mm of the roots to form a relatively consistent debris challenge to be assessed. Then, the debris of each root half was evaluated apically using a modified Hülsmann-score under a light microscope. After remounting the models, root canals were irrigated with NaOCl 3% (2 mL): group 1 with sole needle irrigation, in groups 2 to 4 additionally agitated with different versions of the CanalBrush for 30 s at 600 rpm; group 2, one straight bristle ("old"); group 3, two additional diagonal bristles ("new"); group 4, central straight bristle of the new version removed ("experimental"). Following this, all root halves were reevaluated.
  
  
  RESULTS
  Irrigation reduced debris scores in all groups (Wilcoxon tests, P < .001). Mean debris scores were reduced from a pre-irrigation score of about 4 for all groups to a score of around 2 to 3 in groups 1 and 2, and to scores around 1 in groups 3 and 4. Samples of groups 3 and 4 were significantly cleaner than of groups 1 and 2 (Mann-Whitney tests, P < .05).
  
  
  CONCLUSIONS
  CanalBrushes with diagonal bristles achieved an improved apical cleaning ability.
authors.forename: Matthias Johannes
authors.initials: MJ
authors.lastname: Roggendorf
authors.forename: Florian
authors.initials: F
authors.lastname: Kraus
authors.forename: Ulrich
authors.initials: U
authors.lastname: Lohbauer
authors.forename: Roland
authors.initials: R
authors.lastname: Frankenberger
authors.forename: Anselm
authors.initials: A
authors.lastname: Petschelt
authors.forename: Johannes
authors.initials: J
authors.lastname: Ebert
mesh_terms: D003762:Dental Instruments; D003786:Dental Pulp Cavity; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D015203:Reproducibility of Results; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D018915:Root Canal Preparation / Q000295:instrumentation*; D007507:Therapeutic Irrigation / Q000379:methods*
chemical_list: D012388:Root Canal Irrigants