The better sealing ability of Adseal can be explained by the fact that epoxy resin sealer is considered contraction-free during setting, reactions which is responsible for its appropriate interfacial adaptation.10 Epoxy resins forms an intimate contact with dentin, remains micromechanically retained, reinforces the tooth structure and prevents re-contamination.21 Although it is believed that MTA Fillapex provides a good seal due to the expansion during setting, there is limited research about its physicochemical properties.9