A flowable resin composite, SDR, for dentin replacement was released by Dentsply-Sankin Co. This study
observed the filler distribution of the set resin, and the bonding interface between the SDR in combination with
the bonding agent Xeno JP and enamel/dentin, the paste resin composite for restoration, ESTHET・X HD, under
FE-SEM by Ar-ion beam etching. An extracted human molar was cut perpendicularly to the tooth axis, and the
surfaces of enamel and dentin were finished with #1,000 SiC paper. The surface was treated with the Xeno JP and light-cured, and the SDR was placed lightly on it and light-cured according to the manufacturer’s instructions, and then the ESTHET・X HD was placed on the SDR and light-cured. In the routine technique, the specimen was cut in half and embedded in epoxy resin. After being polished with SiC paper and diamond paste, the specimen was subjected to Ar-ion beam etching for 35 seconds, and then observed under FE-SEM. FE-SEM observation revealed that the fluoro-alumino-silicate glass with a maximum diameter of 10 μm was densely contained in the SDR. The bonding interface of the SDR to enamel/dentin with the bonding agent was tight, and the bonding interface to the ESTHET・X HD was also tight. The SDR showed good adhesion to tooth tissues and a restorative, and was thought to be promising as a flowable resin composite for dentin replacement.
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