Conditioning of resected root end by:
- A- Citric acid.
- B- EDTA.
- C- Phosphoric acid.
- D- H2O2
Out of the listed options, the most common and effective chemical for conditioning resected root ends is: C. Phosphoric acid.
Here's why the other options are less suitable:
A. Citric acid:
While citric acid has some etching properties, it's not as strong or effective as phosphoric acid for removing the smear layer and creating a micro-rough surface for improved bonding with the filling material.
B. EDTA:
EDTA (ethylenediaminetetraacetic acid) primarily chelates calcium ions, making it useful for cleaning root canals but not as effective for etching dentin like phosphoric acid.
D. H2O2 (Hydrogen peroxide):
H2O2 is primarily used for its antimicrobial properties and plays a limited role in conditioning the root surface.
Phosphoric acid:
Phosphoric acid in varying concentrations (10-37%) is the preferred choice for root end conditioning due to its effectiveness in:
- Removing the smear layer:
This debris left behind after root canal preparation can hinder bonding and increase the risk of leakage.
- Creating micro-roughness:
The etched surface provides better mechanical bonding for the root canal filling material.
- Promoting dentin tubule closure:
This minimizes the potential for bacterial infiltration and leakage.
It's important to note that using the appropriate concentration and application time of phosphoric acid is crucial to avoid excessive dentin removal and potential weakening of the root. Following manufacturer's instructions and adhering to best practices in restorative dentistry is essential for successful root end conditioning.
