Nanostructural changes in dentine caused by endodontic irrigants.

Area of Science:

• Dental Nanotechnology
• Material Science in Dentistry
• Endodontic Research

Background:

• Endodontic irrigants are crucial for root canal disinfection.
• Understanding their effects on dentine nanostructure is vital for clinical success.
• Previous studies have focused on macro-level changes, necessitating nanostructural analysis.

Purpose of the Study:

• To investigate the nanostructural alterations in dentine caused by common endodontic irrigants.
• To quantify changes in dentine's mechanical properties at the nanoscale.
• To compare the effects of sodium hypochlorite and ethylenediaminetetraacetic acid on dentine nanostructure.

Main Methods:

• Experimental study utilizing atomic force microscopy (AFM) for nanoindentation.
• Measurements of stiffness and adhesion force on peritubular (PD) and intertubular dentine (ID).
• Application of 5.25% sodium hypochlorite (NaOCl) and 17% ethylenediaminetetraacetic acid (EDTA), followed by comparative analysis.

Main Results:

• EDTA significantly reduced dentine stiffness (ID: 29.80%, PD: 63.53%) and adhesion force (ID: 21.22%, PD: 8.21%).
• NaOCl showed minimal reduction in ID stiffness (2.49%) but increased PD stiffness (15.01%).
• NaOCl increased adhesion force in both ID (25.11%) and PD (23.97%).

Conclusions:

• 17% EDTA demonstrably reduces dentine stiffness and adhesion at the nanostructural level.
• 5.25% NaOCl has a negligible effect on dentine stiffness but significantly increases adhesion forces.
• These findings highlight the differential nanostructural effects of endodontic irrigants on dentine.