title: Dimensional variability of nonstandardized greater taper finger spreaders with matching gutta-percha points.
abstract: OBJECTIVE
  The purpose of this research was to determine the compatibility and dimensional variability between nonstandardized gutta-percha points and matching finger spreaders.
  
  
  METHODS
  The diameters of nonstandardized gutta-percha points (n = 15) and matching finger spreaders (n = 15) from different manufacturers (Kerr, Dentsply Maillefer, Vereignigte Dentalwerke and Roeko) were determined and statistically analysed using a profile projector under a magnification of 50 x (+/- 0.002 mm).
  
  
  RESULTS
  The dimensions of the finger spreaders and gutta-percha cones were inconsistent. Of the 29 groups of nonstandardized gutta-percha cones evaluated, 22 had standard deviations larger than 0.020 at D1. The standard deviations at D11 were greater than at D1, with the exception of those manufactured by Roeko. Overall, nonstandardized gutta-percha cones made by VDW had the greatest dimensional consistency within each size group; the largest variations were seen in the Dentsply Maillefer gutta-percha points. The 13 sizes of nonstandardized finger spreaders were more consistent.
  
  
  CONCLUSIONS
  The results of this study show that corresponding sizes of nonstandardized finger spreaders and gutta-percha cones have statistically significant differences. There were large dimensional variations within sizes and discrepancies between the nominal size and actual size. Thus, these discrepancies may cause problems during root canal filling.
authors: Department of Conservative Dentistry, Johannes Gutenberg University, Mainz, Germany. briseno@mail.uni-mainz.de
authors: B
authors: B
authors: Briseño Marroquín
authors: D
authors: D
authors: Wolter
authors: B
authors: B
authors: Willershausen-Zönnchen
mesh_terms: D004867:Equipment Design; D006171:Gutta-Percha / Q000737:chemistry* / Q000592:standards; D006801:Humans; D012387:Root Canal Filling Materials / Q000737:chemistry* / Q000592:standards; D012389:Root Canal Obturation / Q000295:instrumentation* / Q000592:standards; D013223:Statistics as Topic; D013499:Surface Properties
chemical_list: D012387:Root Canal Filling Materials; D006171:Gutta-Percha