title: The topography of root ends resected with fissure burs and refined with two types of finishing burs.
abstract: OBJECTIVE
  This study compared the surface topography of roots resected with #57, Lindeman, and Multi-purpose burs. Further comparisons were made after refinements with either a multifluted carbide or an ultrafine diamond finishing bur.
  
  
  METHODS
  Three groups of single-rooted human teeth were resected with each resection bur, and resin replicas of the root ends were made. Root ends from each resection bur group were finished with either a multifluted carbide or an ultrafine diamond finishing bur, and the root ends were replicated. All replicas were evaluated at a magnification of x20 for smoothness and surface irregularities. Data analysis was done with the Wilcoxon signed rank test and the chi-square test at a significance level of p < 0.05.
  
  
  RESULTS
  The Multi-purpose bur produced a smoother and more uniplanar surface than the #57 bur and caused less damage to the root than either the #57 or the Lindeman bur. The multifluted carbide finishing bur tended to improve the smoothness of the root end, while the ultrafine diamond tended to roughen the surface.
  
  
  CONCLUSIONS
  The Multi-purpose bur produced the smoothest and most uniplanar resected root-end surface with the least root shattering. The multifluted carbide finishing bur produced a smoother surface than the ultrafine diamond bur.
authors.affiliation: Department of Endodontology, Oregon Health Sciences University, Portland 97201, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: Morgan
authors.forename: J G
authors.initials: JG
authors.lastname: Marshall
mesh_terms: D001047:Apicoectomy / Q000295:instrumentation*; D002244:Carbon; D016009:Chi-Square Distribution; D003754:Dental High-Speed Equipment; D018130:Diamond; D004867:Equipment Design; D006801:Humans; D016628:Replica Techniques; D016037:Single-Blind Method; D013499:Surface Properties; D019227:Tooth Apex / Q000601:surgery* / Q000648:ultrastructure
chemical_list: D002244:Carbon; D018130:Diamond