title: Enlarging characteristics of four nickel-titanium rotary instrument systems under standardized conditions of operator-related variables.
abstract: We aimed to describe a computer-controlled testing device and evaluate the amount of material removed by using 4 Ni-Ti systems in simulated root canals. Eighty resin blocks were used. Hero 642, Hero Shaper, ProFile, and ProTaper rotary instruments were used to prepare the canals. Operator-related variables were standardized with the aforementioned device. Preoperative/postoperative photographic images of canals were measured at 11 levels from the apical tip. Statistical analyses were done with one-way analysis of variance, Tukey honestly significant difference, and Bonferroni tests. Significantly more material was removed by the ProTaper at 9 levels, ProFile at 6, and Hero 642 at 2 levels (P < .05); no significant difference was determined at 5 levels. Our results showed that ProTaper and ProFile removed significantly more material than Hero 642 and Hero Shaper at different levels of the curved root canals under controlled conditions of operator-related variables.
authors.affiliation: Department of Endodontics and Conservative Treatment, Faculty of Dentistry, Gazi University, 06510 Emek, Ankara, Turkey. drdtozguruzun@yahoo.com
authors.forename: Ozgür
authors.initials: O
authors.lastname: Uzun
authors.forename: Ozgür
authors.initials: O
authors.lastname: Topuz
authors.forename: Cumhur
authors.initials: C
authors.lastname: Aydýn
authors.forename: Tayfun
authors.initials: T
authors.lastname: Alaçam
authors.forename: Bülent
authors.initials: B
authors.lastname: Aslan
mesh_terms: D003722:Dental Alloys / Q000737:chemistry; D004867:Equipment Design; D009532:Nickel / Q000737:chemistry; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D014025:Titanium / Q000737:chemistry
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium