SCIENTIFIC ARTICLESProperties of a New Injectable Type of Root Canal Filling Resin with Adhesiveness to Dentin
Section snippets
Root Canal Filling Resin (Endoresin-2)
The composition of Endoresin-2 is shown in Table 1. The PMMA beads used (MB-8C, Sekisui, Osaka, Japan) had a mean diameter of 7 μm and a molecular weight of 11.6 × 104 after γ-irradiation. Barium sulfate (Kanto Chemical, Tokyo, Japan) was treated with a titanate coupling agent (Ajinomoto, Tokyo, Japan). MMA (Mitsubishi Rayon, Tokyo) and TBB (catalyst used in Super-Bond C&B, Sun Medical) were used as received. The powder component, composed of PMMA and barium sulfate, was mixed with the liquid
RESULTS
Table 2 shows flow, working time, setting time, film thickness, solubility, and radiopacity measured according to the ISO standard for dental root canal sealing materials as well as their requirements. All the properties measured satisfied the ISO requirements.
The mean tensile bond strength to dentin was 7.3 ± 4.2 MPa. Figure 1 shows a representative SEM of the fracture surface after tensile bond strength testing, demonstrating cohesive failure within the resin.
The dye penetration for
DISCUSSION
The selection of a polymer component was most important because it had a decisive effect on the working properties and removability. After many trials, we selected special PMMA beads with a mean diameter of 7 μm and a molecular weight of 11.6 × 104. The new material, Endoresin-2, consisted of powder composed of the PMMA and barium sulfate radiopacifier and liquid composed of MMA monomer and TBB catalyst. A mixture of the powder and liquid component had a consistency suitable for injection. The
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Critical Review on Methacrylate Resin-based Root Canal Sealers
2010, Journal of EndodonticsCitation Excerpt :The idea of incorporating 4-META as a resin monomer component for root canal sealers is not new. Endoresin-2 was similar to Hydron because it was designed to be used as an injectable type of en masse root filling material rather than a root canal sealer (57, 58). SuperBond RC Sealer (Sun Medical Co Ltd) is a liquid-and-powder type sealer.
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