title: Comparison of curved canals preparations using profile, GT and Hero 642 rotary files.
abstract: This study compared preparations of curved canals, using Profile, GT file and Hero 642 rotary files. A total of 30 mesiobuccal canals of extracted first and second mandibular molars were used in this study. The teeth were embedded in resin and a pre-operative radiograph was taken. The specimens were then randomly divided into three instrument groups. Pre- and post-instrumentation radiographic images were scanned and superimposed using the VISI CAD/CAM program. At nine horizontal sections at 1 mm increments from the apex, it calculated pre- and post-instrumentation cross sectional areas (mm(2)) and enlargements to the inner aspect and outer aspects (mm). A Kruskal-Wallis test found no statistical difference among the groups in terms of total areas removed by each instrument (P > 0.05). It also found no significant difference in any group between the total of the inner and outer enlargements (P > 0.05). However the GT file removed significantly more material from the outer side of the canal than the inside at sections 3-5, and the Hero removed significantly more material from the outer side at sections 7-9 (P < 0.05). All instruments produced preparations that maintained original canal curvatures.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey. ygarip@yahoo.com
authors.forename: Y
authors.initials: Y
authors.lastname: Garip
authors.forename: N
authors.initials: N
authors.lastname: Gençoğlu
mesh_terms: D003722:Dental Alloys; D003762:Dental Instruments; D006801:Humans; D008334:Mandible; D008963:Molar; D009532:Nickel; D018915:Root Canal Preparation / Q000379:methods*; D014025:Titanium
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium