title: Comparative evaluation of shaping ability of two nickel-titanium rotary systems using cone beam computed tomography.
abstract: BACKGROUND
  We evaluated and compared the effects of different NiTi rotary systems--ProTaper Next and New One Shape--on the volume of dentin removed, canal transportation, and canal curvature in extracted human teeth using CBCT scanning with different voxel sizes.
  
  
  METHODS
  Fifty extracted human maxillary first molars with mesiobuccal canal curvature (25-35°) were used. Specimens were instrumented with the ProTaper Next or New One Shape. Pre- and post-instrumentation scans were performed to compare transportation at the levels of 2, 5, and 8 mm and volumes with two different voxel sizes (0.125-and 0.100-mm(3)) using 3D CBCT images. This study evaluated and compare the volume of dentin removed, canal transportation, and canal curvature. Differences according to instrumentation and voxel sizes were assessed using the Mann-Whitney U-test and the Wilcoxon signed-rank test.
  
  
  RESULTS
  Significant differences were found between apical and coronal levels for both systems (p < 0.05) in canal transportation. In comparing the systems, similar values were found at each level, without significant difference (p > 0.05) in terms of canal curvature and volume. Voxel sizes did not affect the measurements on canal volume, curvature or transportation; no significant difference was found between the 0.100- and 0.125-mm(3) voxel sizes (p > 0.05).
  
  
  CONCLUSIONS
  Both instrumentation systems produced similar canal transportation and volume changes. The two voxel resolutions also showed similar results, however a 0.125-mm(3) voxel size can be recommend for a flat panel CBCT scanner with lower exposure dose.
authors.affiliation: Faculty of Dentistry, Department of Endodontics, Ankara University, Besevler, 06560, Ankara, Turkey. berkancelikten@yahoo.com.tr.
authors.forename: Berkan
authors.initials: B
authors.lastname: Celikten
authors.affiliation: Faculty of Dentistry, Department of Endodontics, Ankara University, Besevler, 06560, Ankara, Turkey. cerenuzuntas@hotmail.com.
authors.forename: Ceren Feriha
authors.initials: CF
authors.lastname: Uzuntas
authors.affiliation: Faculty of Dentistry, Department of DentoMaxillofacial Radiology, Ankara University, Besevler, 06560, Ankara, Turkey. sebnemkursun@yahoo.com.tr.
authors.forename: Sebnem
authors.initials: S
authors.lastname: Kursun
authors.affiliation: Division of Pediatric Dentistry, Ministry of Health, 75th Year Ankara Oral and Dental Health Centre, Cebeci, 06590, Ankara, Turkey. isilcihan@yahoo.com.
authors.forename: Ayse Isil
authors.initials: AI
authors.lastname: Orhan
authors.affiliation: Faculty of Dentistry, Department of Endodontics, Ankara University, Besevler, 06560, Ankara, Turkey. pelintufenkci@gmail.com.
authors.forename: Pelin
authors.initials: P
authors.lastname: Tufenkci
authors.affiliation: Faculty of Dentistry, Department of DentoMaxillofacial Radiology, Ankara University, Besevler, 06560, Ankara, Turkey. call53@yahoo.com.
authors.forename: Kaan
authors.initials: K
authors.lastname: Orhan
authors.affiliation: Ministry of Health, Public Hospitals Agency of Turkey, Bahcelievler, 06490, Ankara, Turkey. dtkemal_ozgur@hotmail.com.
authors.forename: Kemal Özgür
authors.initials: KÖ
authors.lastname: Demiralp
mesh_terms: D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003722:Dental Alloys / Q000737:chemistry*; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging*; D003804:Dentin / Q000000981:diagnostic imaging*; D004492:Edetic Acid / Q000627:therapeutic use; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D008422:Materials Testing; D008963:Molar / Q000000981:diagnostic imaging; D009532:Nickel / Q000737:chemistry*; D011897:Random Allocation; D012388:Root Canal Irrigants / Q000627:therapeutic use; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D016369:Smear Layer / Q000000981:diagnostic imaging; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D014025:Titanium / Q000737:chemistry*; D019227:Tooth Apex / Q000000981:diagnostic imaging
chemical_list: D003722:Dental Alloys; D012388:Root Canal Irrigants; C040654:titanium nickelide; D009532:Nickel; D004492:Edetic Acid; D014025:Titanium; D012973:Sodium Hypochlorite