title: Efficacy of NiTi rotary instruments in removing calcium hydroxide dressing residues from root canal walls.
abstract: was to evaluate the efficacy of three rotary instrument systems (K3, ProTaper and Twisted File) in removing calcium hydroxide residues from root canal walls. Thirty-four human mandibular incisors were instrumented with the ProTaper System up to the F2 instrument, irrigated with 2.5% NaOCl followed by 17% EDTA, and filled with a calcium hydroxide intracanal dressing. After 7 days, the calcium hydroxide dressing was removed using the following rotary instruments: G1 - NiTi size 25, 0.06 taper, of the K3 System; G2 - NiTi F2, of the ProTaper System; or G3 - NiTi size 25, 0.06 taper, of the Twisted File System. The teeth were longitudinally grooved on the buccal and lingual root surfaces, split along their long axis, and their apical and cervical canal thirds were evaluated by SEM (×1000). The images were scored and the data were statistically analyzed using the Kruskall Wallis test. None of the instruments removed the calcium hydroxide dressing completely, either in the apical or cervical thirds, and no significant differences were observed among the rotary instruments tested (p > 0.05).
authors.affiliation: Department of Restorative Dentistry, Unesp, Araraquara, SP, Brazil. kuga@foar.unesp.br
authors.forename: Milton Carlos
authors.initials: MC
authors.lastname: Kuga
authors.forename: Edson Alves de
authors.initials: EA
authors.lastname: Campos
authors.forename: Norberto Batista de
authors.initials: NB
authors.lastname: Faria-Junior
authors.forename: Marcus Vinicius Reis
authors.initials: MV
authors.lastname: Só
authors.forename: André Luis
authors.initials: AL
authors.lastname: Shinohara
mesh_terms: D001843:Bone Cements / Q000737:chemistry*; D002126:Calcium Hydroxide / Q000737:chemistry*; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000737:chemistry*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D009532:Nickel; D018915:Root Canal Preparation / Q000295:instrumentation*; D018709:Statistics, Nonparametric; D013499:Surface Properties; D014025:Titanium
chemical_list: D001843:Bone Cements; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium; D002126:Calcium Hydroxide