title: Comparative evaluation of the preparation efficacies of HERO Shaper and Nitiflex root canal instruments in curved root canals.
abstract: OBJECTIVE
  To comparatively evaluate the shaping efficacies of HERO Shaper rotary instruments and Nitiflex hand files.
  
  
  METHODS
  The mesial roots of 40 mandibular molars were used. In 20 teeth, the mesiobuccal canals were instrumented with HERO Shaper and the mesiolingual canals with Nitiflex. In the remaining 20 teeth, the mesiobuccal canals were instrumented with Nitiflex and the mesiolingual canals with HERO Shaper. Pre- and postoperative sections were obtained from the coronal, middle, and apical portions and analyzed. Statistical analysis was performed using the Student t test.
  
  
  RESULTS
  More dentin was removed from the middle portion with HERO Shaper (P < .05). No statistically significant difference was observed in terms of transportation (P>.05). No instrument fracture or deformation was noted.
  
  
  CONCLUSIONS
  Both HERO Shaper and Nitiflex can be recommended for clinical practice. Further studies can focus on the comparison of HERO Shaper with other rotary instruments as there is an increasing trend for the utilization of these systems.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.
authors.forename: Figen
authors.initials: F
authors.lastname: Kaptan
authors.forename: Semih
authors.initials: S
authors.lastname: Sert
authors.forename: Baybora
authors.initials: B
authors.lastname: Kayahan
authors.forename: Faruk
authors.initials: F
authors.lastname: Haznedaroğlu
authors.forename: Jale
authors.initials: J
authors.lastname: Tanalp
authors.forename: Gündüz
authors.initials: G
authors.lastname: Bayirli
mesh_terms: D003722:Dental Alloys; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D004867:Equipment Design; D006801:Humans; D008963:Molar; D009532:Nickel; D018915:Root Canal Preparation / Q000295:instrumentation*; D014025:Titanium
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium