Resin-based sealer do not completely adhere to each other or to the root canal walls, thus resulting in insufficient sealing and microbial leakage. The purpose of this study was to develop a new adhesive root canal filling material containing EMA resin and to assess its physical properties.
Methods:
(1) Preparation of specimens
EMA resin was prepared by mixing the following components: (monomer) 60% methacryloxyethyl methyl succinate, 40% 1,6-hexanediol dimethacrylate, 0.6% DL-comphorquinone and 3.0% dibutyltinlaurylate and (polymer) polyethylmethacrylate. And ethanol was added at various concentrations into the EMA resin.
(2) Elastic modulus
These specimens were measured with INSTRON 4481 and the elasticity modulus was calculated.
(3) Longitudinal weight changes
Each specimen was kept into the bottle in the temperature room without the lid. The change in weigh was measured t every 24 hours.
(4) Adhesive test
A gap (0.5mm) was made between the 2 specimens. Resin-based sealer was placed between 2 specimens. And so, those were measured with INSTRON 4481, and the tensile strength of specimens was calculated. Then, the surface texture of the specimen were observed.
(4) FT-IR
The molecular bonding characterization of the specimen including ethanol was analyzed and compared with the non-ethanol specimen.
Results:
The EMA resin-based material showed an ethanol dose-dependent decrease in the elastic modulus value. The weight of specimen decreased as the time erupted, and the phenomenon was remarkable as the concentration of ethanol getting higher. The adhesive strength of the EMA resin was also weakened dose-dependently by the ethanol, and was significantly higher than that of the GP.
EMA resin was not reacted chemically with Ethanol according to the results from FT-IR.
Conclusions:
The newly developed EMA resin-based material is suitable for clinical use as a root canal filling material.