comparative analysis of adhesion and bond strength of bioactive obturating materials with root dentin

ABSTRACT

Obturation of root canal is an important step in root canal therapy. Gutta percha is the most commonly used material to fill the root canal for obturation. In this study composites ofgutta percha with 10% hydroxyapatite [HA] and polyurethane [10% and 20%] were investigated to find out their adhesion and bond strength with root dentin after 7 days. Extracted human teeth were used for this study and in vitro root canal obturation was done. After filling the samples were immersed separately in deionised water solution. Push out test and scanning electron microscopy [SEM] was done to find out the adhesion and bond strength of these materials. Push out test and SEM evaluation of these obturating materials showed that gutta percha had maximum bond strength, where as gutta percha with 10% hydroxy apatite had minimum bond strength as compared to other bioactive materials used in this study. Polyurethane composite with 20% HA was next to gutta percha in terms of its bond strength followed by polyurethane with 10% HA. Gutta percha obturating material proved to be the best regarding adhesion and bonding with the root dentin but polyurethane [with 10% and 20% HA] also looked promising.