Elsevier

Journal of Endodontics

Volume 29, Issue 1, January 2003, Pages 20-23
Journal of Endodontics

SCIENTIFIC ARTICLES
Properties of a New Injectable Type of Root Canal Filling Resin with Adhesiveness to Dentin

https://doi.org/10.1097/00004770-200301000-00006Get rights and content

The properties of a new, injectable type of root canal wall, adhesive filling resin, which we developed, were studied for its physical properties, adhesiveness to dentin and the root canal, and sealing ability. The new resin consisted of a powder composed of a specially selected poly(methyl methacrylate) and barium sulfate radiopacifier and liquid composed of methyl methacrylate monomer and tributylborane catalyst. A mixture of both components had a consistency suitable for injection. The physical properties, including radiopacity, were evaluated according to the ISO standard. The adhesiveness to dentin and the root canal was investigated by bond strength testing or by scanning electron microscopy. The apical sealing ability of the new resin was compared by a dye penetration test with that of gutta-percha/sealer. The findings of this study indicated that the new filling resin had physical properties satisfying all the ISO requirements for dental root canal sealing materials: a tensile bond strength to dentin of 7.3 MPa, a significantly better sealing ability compared with gutta-percha/sealer, the capability of forming resin tags in dentinal tubules, and removability.

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

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    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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