title: The effect of instrumentation with two different file types, each with 2.5% NaOCl irrigation on the microhardness of root dentin.
abstract: The aim of this study was to measure root-dentin microhardness after instrumentation with two types of files and using irrigation with 2.5% sodium hypochlorite. Thirty roots were instrumented with irrigation: 10 roots had the pulp extirpated only; 10 roots were instrumented with stainless steel files, and 10 roots were instrumented with rotary nickel-titanium (NiTi) files. Additionally, five roots were extirpated only without irrigation and served as a control. The roots were sliced and root-dentin microhardness was determined at depths of 500 microm and 1000 microm from the pulp-dentin interface. Significant differences were found between the microhardness at 500 microm and 1000 microm (p < 0.001) in all groups. Instrumentation with NiTi rotary files affected dentin microhardness significantly to a lesser extent.
authors.affiliation: Department of Endodontics, The Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel.
authors.forename: Iris
authors.initials: I
authors.lastname: Slutzky-Goldberg
authors.forename: Reuven
authors.initials: R
authors.lastname: Liberman
authors.forename: Ilana
authors.initials: I
authors.lastname: Heling
mesh_terms: D000704:Analysis of Variance; D003722:Dental Alloys; D003804:Dentin / Q000187:drug effects* / Q000648:ultrastructure; D004202:Disinfectants / Q000627:therapeutic use*; D004867:Equipment Design; D006244:Hardness; D006801:Humans; D009532:Nickel; D011670:Pulpectomy / Q000295:instrumentation; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D012973:Sodium Hypochlorite / Q000627:therapeutic use*; D013193:Stainless Steel; D013223:Statistics as Topic; D013997:Time Factors; D014025:Titanium; D014092:Tooth Root / Q000187:drug effects* / Q000648:ultrastructure
chemical_list: D003722:Dental Alloys; D004202:Disinfectants; D012388:Root Canal Irrigants; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D014025:Titanium; D012973:Sodium Hypochlorite