The effect of sodium hypochlorite on the surface characteristics and fatigue resistance of ProFile nickel-titanium instruments

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2006 Oct;102(4):e99-105. doi: 10.1016/j.tripleo.2006.02.018. Epub 2006 Aug 10.

Abstract

Objective: Evaluate the effect of 5.25% NaOCl on the surface characteristics and fatigue resistance of ProFile.

Study design: Eighty new ProFile instruments were divided into 1 control group (CG) and 3 experimental groups (EG1, EG2, EG3). Instruments of EG1 were immersed in 5.25% NaOCl for 24 hours. Instruments of EG2 and EG3 shaped 10 curved root canals, using, respectively, deionized water and 5.25% NaOCl as irrigants. Surface characteristics were observed by scanning electron microscopy. All instruments were then submitted to fatigue tests. Two-way ANOVA tests were employed to compare the results.

Results: Surface characteristics showed no alteration after the immersion tests. The fatigue resistance of instruments in EG2 and EG3 was significantly lower than in CG and EG1.

Conclusions: Immersion of ProFile in 5.25% NaOCl for 24 hours had no influence on surface characteristics and fatigue resistance. Simulated clinical use was a decisive factor in the decrease of fatigue life.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Analysis of Variance
  • Corrosion
  • Dental Alloys*
  • Dental Instruments*
  • Dental Stress Analysis
  • Equipment Failure
  • Equipment Reuse
  • Humans
  • Materials Testing
  • Microscopy, Electron, Scanning
  • Nickel*
  • Root Canal Irrigants*
  • Root Canal Preparation / instrumentation*
  • Sodium Hypochlorite*
  • Surface Properties
  • Titanium*

Substances

  • Dental Alloys
  • Root Canal Irrigants
  • titanium nickelide
  • Nickel
  • Titanium
  • Sodium Hypochlorite