title: An in-vitro Evaluation of canal transportation and centering ability of two rotary Nickel Titanium systems (Twisted Files and Hyflex files) with conventional stainless Steel hand K-flexofiles by using Spiral Computed Tomography.
abstract: BACKGROUND
  The purpose of this in-vitro study was to compare canal transportation and centering ability of Twisted and Hyflex Rotary Files with stainless steel hand k-flexofiles by using Spiral Computed Tomography.
  
  
  METHODS
  A total of 90 freshly extracted human mandibular single rooted Premolar teeth were selected. The crowns were flattened with steel disks and a final dimension of 18-mm WL was achieved for each tooth. Canals were divided randomly into 3 groups of 30 teeth each. Group I:Hyflex files, Group II:Twisted files, Group III:stainless steel hand k-flexofiles. Three sections from apical, mid-root, and coronal levels of the canal were recorded. All the teeth were scanned before and after instrumentation by using Spiral Computed Tomography.
  
  
  RESULTS
  K-files showed highest transportation and less centered when compared to the Twisted and Hyflex rotary files. No significant difference was found between TF and Hyflex CM instruments.
  
  
  CONCLUSIONS
  TF and Hyflex files shaped curved root canals without significant shaping errors when compared to the Hand stainless steel k-flexofiles. How to cite this article: Kumar BS, Pattanshetty S, Prasad M, Soni S, Pattanshetty KS, Prasad S. An in-vitro Evaluation of canal transportation and centering ability of two rotary Nickel Titanium systems (Twisted Files and Hyflex files) with conventional stainless Steel hand K-flexofiles by using Spiral Computed Tomography. J Int Oral Health 2013;5(5):108-15.
authors: Department of Conservative Dentistry & Endodontics, D A P M R V Dental College, Bangalore, Karnataka, India.
authors: B Shiva
authors: BS
authors: Kumar
authors: Spoorti
authors: S
authors: Pattanshetty
authors: Manju
authors: M
authors: Prasad
authors: Sunny
authors: S
authors: Soni
authors: Kirti S
authors: KS
authors: Pattanshetty
authors: Shiva
authors: S
authors: Prasad
keywords: canal transportation; centering ability; spiral computed tomography