Effect of sodium hypochlorite-based formulations on the adhesion interface after fiber post cementation

Area of Science:

• Endodontics
• Dental Materials Science
• Adhesive Dentistry

Background:

• Post-endodontic restorations require effective post-space preparation and cementation.
• Sodium hypochlorite (NaOCl) is a common irrigant but its effect on cementation interfaces is not fully understood.
• Investigating NaOCl-based irrigants' impact on cementation is crucial for long-term restoration success.

Purpose of the Study:

• To evaluate the influence of different sodium hypochlorite-based irrigants on residue persistence, bond strength, and tag formation after post-space irrigation.
• To compare the effects of distilled water, sodium hypochlorite solution, sodium hypochlorite gel, and sodium hypochlorite with surfactant.

Main Methods:

• Roots were irrigated with distilled water (DW), sodium hypochlorite solution (SHS), sodium hypochlorite gel (SHG), or sodium hypochlorite with surfactant (SHT).
• Residue persistence was assessed using scanning electron microscopy (SEM).
• Push-out bond strength, failure mode, and tag formation were analyzed on separate root samples.

Main Results:

• No significant differences in residue persistence were observed among the groups.
• Distilled water (DW) demonstrated the highest bond strength and tag formation.
• Sodium hypochlorite with surfactant (SHT) exhibited the best performance, with fewer negative effects on the adhesive interface compared to the control.

Conclusions:

• Irrigation protocols using sodium hypochlorite-based solutions do not significantly impact residue persistence.
• While distilled water promotes higher bond strength, sodium hypochlorite with surfactant offers a favorable outcome by minimizing adverse effects on the cementation interface.
• The choice of irrigant warrants careful consideration to balance cleaning efficacy with preservation of the adhesive bond in post-endodontic procedures.