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Published on: June 6, 2025
Structural effects of sodium hypochlorite solution on RaCe rotary nickel-titanium instruments: an atomic force
Ozgur Topuz1, Cumhur Aydin, Ozgur Uzun
1Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Summary
Sodium hypochlorite (NaOCl) immersion significantly deteriorates the surface of RaCe rotary nickel-titanium instruments. Clinicians should use caution to prevent unexpected instrument failure.
Area of Science:
- Endodontics
- Materials Science
Background:
- Nickel-titanium rotary instruments are widely used in endodontic procedures.
- Sodium hypochlorite is a common irrigant in endodontics but its effect on instrument surface integrity is a concern.
Purpose of the Study:
- To evaluate the surface topography changes of RaCe rotary nickel-titanium instruments after immersion in sodium hypochlorite.
- To assess the impact of sodium hypochlorite on the surface characteristics of endodontic instruments using atomic force microscopy.
Main Methods:
- Four new RaCe instruments (two 30.06, two 30.02) were utilized.
- Instruments were immersed in sodium hypochlorite solution for 5 minutes.
- Surface topography was analyzed using atomic force microscopy (AFM) at 11 points along a 3-mm section, comparing root mean square (RMS) values.
Main Results:
- Mean RMS values were significantly higher for instruments exposed to sodium hypochlorite compared to new instruments (P < .01).
- Atomic force microscopy revealed statistically significant surface deterioration on RaCe instruments after NaOCl immersion.
Conclusions:
- Sodium hypochlorite causes surface deterioration on RaCe nickel-titanium instruments.
- Careful clinical use of sodium hypochlorite is recommended due to the risk of unexpected instrument failure.
