title: Evaluation of apical debris removal using various sizes and tapers of ProFile GT files.
abstract: The purpose of this study was to evaluate the effect of preparation taper using size #20 or size #40 ProFile GT files on the ability to introduce irrigant and remove debris from root canals. Forty-eight bilaterally matched pairs of extracted teeth were instrumented using.04-,.06-,.08-, and.10-tapered files with one tooth of each pair enlarged to size #20 and the other to size #40. The teeth were sectioned at 1 mm and 3 mm from the apex, and the amount of remaining debris was calculated as a percentage of the total lumen area. The following variables were evaluated: apical preparation size, preparation taper, total volume of irrigation, depth of irrigation needle penetration, and number of instrument changes needed to reach working length. Compared with the size #40 preparations, a significantly greater percentage of remaining debris was observed in the size #20 preparations at the 1-mm level for all tapers except the.10 taper group in which there was no significant difference (p = 0.982). There were no significant differences between any groups at 3 mm. Results suggest that debris is more effectively removed using.04,.06, and.08 ProFile GT instruments when the apical preparation size is larger (size #40) compared with size #20 apical preparations. When a taper of.10 can be produced at the apical extent of the canal, there is no difference in debris removal between the two preparations sizes.
authors.affiliation: School of Dentistry, Oregon Health & Science University, 611 SW Campus Drive, Portland OR, USA.
authors.forename: Lynn J
authors.initials: LJ
authors.lastname: Albrecht
authors.forename: J Craig
authors.initials: JC
authors.lastname: Baumgartner
authors.forename: J Gordon
authors.initials: JG
authors.lastname: Marshall
mesh_terms: D000704:Analysis of Variance; D016022:Case-Control Studies; D003722:Dental Alloys; D003786:Dental Pulp Cavity / Q000473:pathology*; D004867:Equipment Design; D006801:Humans; D016014:Linear Models; D016555:Matched-Pair Analysis; D009339:Needles; D009532:Nickel; D012388:Root Canal Irrigants / Q000627:therapeutic use; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D014025:Titanium; D019227:Tooth Apex / Q000473:pathology*
chemical_list: D003722:Dental Alloys; D012388:Root Canal Irrigants; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium