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Effect of sodium hypochlorite on dentin microhardness.
Iris Slutzky-Goldberg1, Manal Maree, Reuven Liberman
1Department of Endodontics, the Hebrew University-Hadassah School of Dental Medicine. slutsky@netvision.net.il
Journal of Endodontics
|November 27, 2004
Summary
Higher concentrations of sodium hypochlorite (NaOCl) significantly reduce root dentin microhardness. This effect is more pronounced with longer irrigation times and higher NaOCl concentrations, impacting root canal treatment outcomes.
Area of Science:
- Endodontics
- Dental Materials Science
Background:
- Sodium hypochlorite (NaOCl) is a widely used irrigant in endodontic therapy.
- Understanding its effect on root dentin is crucial for preserving tooth structure integrity.
Purpose of the Study:
- To evaluate the impact of 2.5% and 6% sodium hypochlorite solutions on root dentin microhardness.
- To assess the influence of varying irrigation durations (5, 10, 20 minutes) on this effect.
Main Methods:
- Forty-two bovine roots were divided into seven groups.
- Groups were irrigated with saline (control), 2.5% NaOCl, or 6% NaOCl for 5, 10, or 20 minutes.
- Root dentin microhardness was measured at 500, 1000, and 1500 µm from the lumen.
Main Results:
- A decrease in microhardness was observed at 500 µm in samples irrigated with both 2.5% and 6% NaOCl compared to the control.
- Significant microhardness reduction occurred with 10 and 20-minute irrigation periods.
- The reduction in microhardness was more substantial with 6% NaOCl than with 2.5% NaOCl at all measured depths.
Conclusions:
- Both 2.5% and 6% sodium hypochlorite reduce root dentin microhardness.
- Higher concentrations and longer irrigation times exacerbate this effect.
- Clinical protocols should consider these findings to minimize potential dentin weakening.