The effect of irrigation time, root morphology and dentine thickness on tooth surface strain when using 5% sodium hypochlorite and 17% EDTA
- 8 February 2010
- journal article
- Published by Wiley in International Endodontic Journal
- Vol. 43 (3), 190-199
- https://doi.org/10.1111/j.1365-2591.2009.01655.x
Abstract
To evaluate the effect of irrigation with 5% sodium hypochlorite (NaOCl) alone and in conjunction with 17% ethylenediaminetetraacetic acid (EDTA) on tooth surface strain (TSS) and to analyse the influence of irrigation time, root morphology and dentine thickness. Thirty-six single-rooted pre-molars with single canals had their crown and enamel reduced and root canals prepared using a standardized protocol. Teeth were grouped according to anatomical criteria and randomly distributed to experimental irrigation groups: (A) saline (negative control); (B) 5% NaOCl (positive control); (C) 5% NaOCl alternated with 17% EDTA. TSS was measured using electrical strain gauges bonded to the cervico-proximal part of the tooth. Teeth, mounted in clear acrylic resin placed in a universal testing machine, were subjected to nine consecutive 10-min irrigation periods followed by non-destructive occlusal loading to record TSS. Statistical analysis was carried out using two-way hierarchical anova and post hoc multiple comparisons. Two groups showed an increase in TSS from the baseline (initial 10-min irrigation with saline). Group A showed a negligible reduction of 1.2% (343-339 muepsilon), which was not statistically significant (P = 0.7). Group B showed a highly significant (P = 0.001) increase in TSS by 53.7% (178-253 muepsilon), and group C showed a significant (P = 0.02) increase in TSS by 17.4% (163-192 muepsilon). The rate of change in TSS was significantly different between test groups. The length of the tooth (P = 0.04) as well as the mesio-distal (P = 0.05) width had significant effects on TSS. Irrigation with 5% with or without 17% EDTA increased TSS. The increase was significantly greater with 5% NaOCl alone than with 5% NaOCl alternated with 17% EDTA in contrast to previous findings with longer duration of irrigant exposure. Tooth length and mesio-distal root width significantly contributed to the increase in TSS.Keywords
This publication has 19 references indexed in Scilit:
- The effect of sodium hypochlorite and ethylenediaminetetraacetic acid irrigation, individually and in alternation, on tooth surface strainInternational Endodontic Journal, 2009
- Impact of Irrigant Sequence on Mechanical Properties of Human Root DentinJournal of Endodontics, 2007
- A bio‐molecular film ex‐vivo model to evaluate the influence of canal dimensions and irrigation variables on the efficacy of irrigationInternational Endodontic Journal, 2007
- Effects of Dentin on the Antimicrobial Properties of Endodontic MedicamentsJournal of Endodontics, 2007
- Calcium Loss From Root Canal Dentin Following EDTA, EGTA, EDTAC, and Tetracycline-HCl Treatment With or Without Subsequent NaOCl IrrigationJournal of Endodontics, 2007
- Interaction between EDTA and Sodium Hypochlorite: A Nuclear Magnetic Resonance AnalysisJournal of Endodontics, 2006
- Mechanisms and risk factors for fracture predilection in endodontically treated teethEndodontic Topics, 2006
- A scanning electron microscopic evaluation of four root canal irrigation regimensJournal of Endodontics, 1987
- The antibacterial action of sodium hypochlorite and EDTA in 60 cases of endodontic therapyInternational Endodontic Journal, 1985
- A scanning electron microscopic comparison of a high volume final flush with several irrigating solutions: Part 3Journal of Endodontics, 1983