title: Comparison of three files to prepare curved root canals.
abstract: Flex-R, Ultra-Flex (Ni-Ti construction), and K-type files were compared using a circumferential filing technique on 96 extracted human maxillary molars. Buccal canals with minimal initial curvature of 24 degrees were used. The maximal initial curvature was 52 degrees. Canal curvature was measured before and after filling, and changes were analyzed statistically. The angle of curvature was better maintained with the Flex-R and Ultra-Flex files.
authors.affiliation: Department of Oral Fundamental Sciences, School of Dental Surgery, Lebanese University (section II), Lebanon.
authors.forename: F E
authors.initials: FE
authors.lastname: Bou Dagher
authors.forename: G M
authors.initials: GM
authors.lastname: Yared
mesh_terms: D000704:Analysis of Variance; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D004708:Endodontics / Q000295:instrumentation*; D006801:Humans; D008963:Molar; D009532:Nickel; D012390:Root Canal Therapy / Q000295:instrumentation*; D014025:Titanium
chemical_list: D009532:Nickel; D014025:Titanium