Structural effects of sodium hypochlorite solutions on gutta-percha cones: atomic force microscopy study

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Materials Science

Background:

• Atomic force microscopy (AFM) is crucial for material structural characterization.
• Gutta-percha cones are widely used in endodontics.
• Understanding the effects of irrigants on gutta-percha is vital for clinical success.

Purpose of the Study:

• To evaluate the impact of varying sodium hypochlorite (NaOCl) concentrations on the structural integrity and elasticity of gutta-percha cones.
• To determine a safe concentration of NaOCl for rapid gutta-percha cone decontamination.

Main Methods:

• Standardized gutta-percha cones were immersed in 0.5%, 2.5%, and 5.25% NaOCl solutions for 1 and 5 minutes.
• Atomic force microscopy (AFM) was used to analyze topographic and elastic properties (RMS values).
• Statistical analysis (ANOVA with Fisher's LSD) was performed to compare treated samples with a control group.

Main Results:

• 5.25% NaOCl significantly reduced gutta-percha elasticity after 1 minute.
• 2.5% and 5.25% NaOCl induced topographic changes after 5 minutes.
• 0.5% NaOCl showed no significant alterations in topography or elasticity compared to the control.

Conclusions:

• 0.5% NaOCl is a safe and effective solution for rapid decontamination of gutta-percha cones.
• Higher NaOCl concentrations can adversely affect gutta-percha properties, potentially impacting endodontic treatment outcomes.
• AFM is a valuable tool for assessing the effects of chemical agents on dental materials.