title: Efficacy of five rotary systems versus manual instrumentation during endodontic retreatment.
abstract: The purpose of this study was to evaluate the efficiency of ProFile, GT, ProTaper, Race and K3 rotary instruments compared with hand K-files for removal of gutta-percha during retreatment. Sixty mandibular premolars were instrumented with GT rotary files and filled by thermomechanical compaction of gutta-percha and AH Plus sealer. The teeth are randomly divided into 6 groups of 10 specimens each. The roots were split longitudinally, digital images were created using a flatbed scanner, and the areas with remaining filling material were demarcated using Image Tool 1.21 software. The results indicate that GT left significantly less (p<0.05) remaining filling material (1.18 ± 1.47) than hand (3.70 ± 3.16) and Hero instruments (2.99 ± 2.58). There was no statistically significant difference (p<0.05) among the others techniques: ProFile (1.99 ± 2.66), ProTaper (2.00 ± 1.99) and K3 (2.71 ± 2.87) when compared with GT. In conclusion, GT, ProFile, ProTaper and K3 were more effective in removing gutta-percha than manual and Hero instruments.
authors.affiliation: PUC-Pontifical Catholic University of Paraná, PR, Brazil. fariniuk@uol.com.br
authors.forename: Luiz Fernando
authors.initials: LF
authors.lastname: Fariniuk
authors.forename: Vânia Portela Dietzel
authors.initials: VP
authors.lastname: Westphalen
authors.forename: Ulisses Xavier da
authors.initials: UX
authors.lastname: Silva-Neto
authors.forename: Everdan
authors.initials: E
authors.lastname: Carneiro
authors.forename: Flares
authors.initials: F
authors.lastname: Baratto Filho
authors.forename: Sandra Rivera
authors.initials: SR
authors.lastname: Fidel
authors.forename: Rivail Antônio Sérgio
authors.initials: RA
authors.lastname: Fidel
mesh_terms: D001641:Bicuspid / Q000473:pathology; D002133:Calcium Sulfate / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry; D003786:Dental Pulp Cavity / Q000473:pathology; D004526:Efficiency; D004853:Epoxy Resins / Q000737:chemistry; D004867:Equipment Design; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D009532:Nickel / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D019233:Retreatment; D012387:Root Canal Filling Materials / Q000737:chemistry; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D012399:Rotation; D012984:Software; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D003722:Dental Alloys; D003738:Dental Cements; D004853:Epoxy Resins; D011145:Polyvinyls; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; C040654:titanium nickelide; C020872:Cavit; D009532:Nickel; D006171:Gutta-Percha; D014025:Titanium; D015034:Zinc Oxide; D002133:Calcium Sulfate