ABSTRACT
Objective: This investigation evaluated the push-out bond strength (POBS) of three root canal filling materials: Zinc-oxide and eugenol (ZOE), calcium hydroxide (CaOH) and mineral trioxide aggregate (MTA) after application of two intracanal irrigants [3% Sodium Hypochlorite (NaOCl) or 2% Chlorhexidine Gluconate (CHX)] on primary anterior teeth. Methodology: The roots of 60 primary anterior teeth were prepared and sectioned (3-4 slices/root) with 1.00 mm thickness. Each root slice was irrigated for 4 min with 3% NaOCl or 2% CHX, dried and filled with ZOE, CaOH or MTA. Then the push-out force was applied at a cross-head speed of 0.5 mm/min until bond failure occur and the mode of failure was recorded.
Results: There was significant difference between the POBS of all filling materiel (p<0.05). MTA showed the lowest bond for both NaOCl and CHX. However, CaOH and ZOE showed higher bond strength to root dentin when irrigated with NaOCl than CHX.
Conclusion: A combination of ZOE\NaOCl has the highest POBS to root dentin of primary teeth. While the use of CHX with all root canal filling materials showed lower POBS. MTA with either NaOCl or CHX showed the lowest POBS to root dentin of primary teeth.
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