# Micro-hardness of root canal dentin using various irrigating solutions: An in vitro study

## TL;DR

This study compares how different root canal irrigation solutions affect the hardness of dentin in extracted teeth.

## Contribution

The study identifies 2% Chlorhexidine as a suitable irrigation solution due to its minimal impact on dentin microhardness.

## Key findings

- 17% EDTA caused the most significant reduction in dentin microhardness.
- 2% Chlorhexidine did not negatively affect dentin microhardness.
- 3% Sodium Hypochlorite and 2% Chlorhexidine showed no significant difference compared to the control.

## Abstract

Evaluation of changes in dentin microhardness during root canal irrigation using eighty extracted mandibular premolars is of interest.
After decoronation and halving, baseline microhardness was measured with a Vickers tester. The samples were divided into four groups:
control (Normal Saline), 3% Sodium Hypochlorite, 17% EDTA, and 2% Chlorhexidine Gluconate, with each immersed in their respective
irrigants for 15 minutes at 37°C. Results showed decreased microhardness in all groups except the control, with 17% EDTA causing the
most significant reduction. Notable differences were found between groups 2, 4, and 1, but not between 1 and 3. Consequently, 2%
Chlorhexidine is considered a suitable irrigation solution as it did not negatively impact dentin microhardness.