Efficacy of sodium hypochlorite, ethylenediaminetetraacetic acid, citric acid and phosphoric acid in calcium hydroxide removal from the root canal: a microscopic cleanliness evaluation

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2011 Dec;112(6):820-4. doi: 10.1016/j.tripleo.2011.08.001.

Abstract

Rooted molars were subjected to standardized canal instrumentation to a master apical file (MAF). The samples were dressed with Ca(OH)(2), and after 7 days, teeth were reopened and Ca(OH)(2) medication was removed by 1 of 4 different experimental procedures: 2.5% sodium hypochlorite (NaOCl) (n = 10); 17% EDTA-T (n = 10); 10% citric acid (n = 10); or 37% phosphoric acid (n = 10). This was followed by reinstrumentation with MAF plus 15 mL saline solution. The roots were prepared for scanning electron microscopic analysis of the cervical, middle, and apical thirds. Statistical analysis was performed with the Kruskal-Wallis test. EDTA-T and phosphoric acid gave the best results in the apical third, with significant statistical differences compared with other groups. NaOCl gave the worst results. Irrigation with 17% EDTA-T and 37% phosphoric acid is more effective than sodium hypochlorite and citric acid in the removal of calcium hydroxide from the apical third.

Publication types

  • Comparative Study

MeSH terms

  • Calcium Hydroxide / chemistry*
  • Citric Acid / chemistry
  • Citric Acid / therapeutic use*
  • Dental Pulp Cavity / drug effects*
  • Dental Pulp Cavity / ultrastructure
  • Dentin / drug effects
  • Dentin / ultrastructure
  • Edetic Acid / chemistry
  • Edetic Acid / therapeutic use*
  • Humans
  • Materials Testing
  • Microscopy, Electron, Scanning
  • Phosphoric Acids / chemistry
  • Phosphoric Acids / therapeutic use*
  • Root Canal Irrigants / chemistry
  • Root Canal Irrigants / therapeutic use*
  • Root Canal Preparation / instrumentation
  • Root Canal Preparation / methods
  • Sodium Hypochlorite / chemistry
  • Sodium Hypochlorite / therapeutic use*
  • Solvents / chemistry
  • Solvents / therapeutic use*
  • Therapeutic Irrigation
  • Time Factors
  • Tooth Apex / drug effects
  • Tooth Apex / ultrastructure

Substances

  • Phosphoric Acids
  • Root Canal Irrigants
  • Solvents
  • Citric Acid
  • Edetic Acid
  • Sodium Hypochlorite
  • phosphoric acid
  • Calcium Hydroxide