关键词: 根管桩, 玻璃纤维, 复合材料, 力学性能

Abstract: A new type of fiber-reinforced thermoplastic composite for dental endodontic post was prepared, in which a blend of poly（bisphenol A glycidyl dimethacrylate）/poly（methyl methacrylate） (PBGD/PMMA) was used as the matrix and glass fiber as reinforcer. The composite was characterized using glass transition temperature determination, SEM observation, and three-point bending test. The optimal preparation process was as follows: 74.1 wt % of glass fiber was impregnated with a mixture of monomers (BGD/MMA=80/20w), after a pre-polymerization at 80℃ for 2 h, the prepreg was pultruded at 1.0 cm/min and subsequently photopolymerized for 60 s. Thus obtained composite gave rise to a bending strength of 648.01 MPa and a bending modulus of 33.12 GPa, which was close to those of dentin.

Key words: endodontic post, glass fiber, composite, mechanical property