title: [Evaluation of preparation of curved root canals using hand-used ProTaper].
abstract: OBJECTIVE
  To evaluate the shaping ability of hand-used ProTaper on curved canals using Endodontic Cube.
  
  
  METHODS
  Fifty-four curved root canals in vitro were selected and divided into three groups according to the curved degree (alpha), group A: 0 degrees < or = alpha < 25 degrees , group B: 25 degrees < or = alpha < 40 degrees , group C: 40 degrees < or = alpha < 55 degrees . Endodontic Cube was assembled, and each sample was sectioned perpendicular to the axis of the tooth into four sections with Isomer-Buhler in low speed. Then the root canals were prepared with hand-used ProTaper. Before and after shaping, photograph of all the sections were taken under a stereomicroscope. Statistical analyses were performed.
  
  
  RESULTS
  The dentin cutting quantity of the whole canal prepared with ProTaper in group B and C was larger than that of group A. The deviation distance of the whole canal prepared by ProTaper in group C was significantly larger than that in group A, and the deviation distance in middle portion larger than that in group B. The maintaining ability in the middle portion of group C by ProTaper was worse than that of group A and B.
  
  
  CONCLUSIONS
  The curvature of root canal may increase the cutting quantity of the -dentin and reduce the ability of remaining original canal shape prepared by ProTaper.
authors: Department of Cariology and Endodontology, School of Stomatology, Wuhan University, Wuhan 430079, China.
authors: Min
authors: M
authors: Nie
authors: Xin-Chen
authors: XC
authors: Zhao
authors: Bin
authors: B
authors: Peng
authors: Ming-Wen
authors: MW
authors: Fan
authors: Zhuan
authors: Z
authors: Bian
mesh_terms: D003762:Dental Instruments; D012390:Root Canal Therapy / Q000295:instrumentation* / Q000379:methods*