Objective: To synthesize a new dimethacrylates-based root canal sealer(NRCS) and evaluate its sealing ability. Methods: A new dimethacrylates monomer 9,9'-bis(4-hydroxy-phenyl) fluorine diglycidyl methacrylate (HPFDM) with molecular weight of 634 was prepared by epoxying 9,9'-bis(4-hydroxy-phenyl) fluorine(9'9-HPF) with epichlorohydrin, and then reacting with methacrylic acid. The new resin-based root canal sealer (NRCS) was made of this new monomer as one of its chief component. The structure of the new monomer was confirmed by FT-IR and the new sealer's sealing ability was evaluated using a glucose quantitative microleakage model.
Results: The result of FT-IR confirmed that the structure of the new monomer was the same as designed. NRCS has the properties of flowability, adhesion and dual-curablity. The microleakage of NRCS and Resilon/GP were much lower than Epiphany and Resilon/GP(P <0.01).
Conclusions: The present study demonstrates that the new dimethacrylates monomer (HPFDM) with high molecular weight and the new resin-based root canal sealer (NRCS) were successfully made. The sealing ability of NRCS was better than that of the Epiphany.