Influences of iodonium salts on the properties of a hybrid composite resin containing BisS-GMA and expanding monomer modified epoxy

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 30; no. 6; pp. 1184 - 1190
• Main Authors: Liu, Wenjia, Fu, Jing, Wu, Xiangnan, Ma, Yuanyuan, Liu, Xiaoqing, Liao, Yunmao, Wang, Hang
• Format: Journal Article
• Language: English
• Published: Wuhan Wuhan University of Technology 01.12.2015; Springer Nature B.V
• Subjects: Advanced Materials; Chemistry and Materials Science; Conversion; Hybrid composites; Materials Science; Mechanical properties; Monomers; Polymer matrix composites; Polymers; Resins; Shrinkage; compressive strength; volume shrinkage; BisS-GMA; SOC; diphenyliodonium hexafluorphosphate; degree of conversion
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-015-1293-4

In order to reduce shrinkage and improve the mechanical properties of dental composite resins, we designed a hybrid resin formulation containing a novel matrix resin, BisS-GMA [bisphenol-Sbis( 3-methacrylato-2-hydroxypropyl)ether], and epoxy modified by a spiro-orthocarbonate (SOC) expanding monomer. Then, we tested the effects of an iodonium salt, diphenyliodonium hexafluorphosphate (DPIHFP), on the properties of the hybrid resin with seven different concentrations. The hybrid resin was polymerized by a ternary photo-initiator system. The volumetric shrinkage (VS), degree of conversion (DC) and compressive strength (CS) were assessed using AcuVol™, FTIR and a universal testing machine, respectively. The VS, DC and CS were improved with increasing DPIHFP concentration, but a high concentration of DPIHFP had a negative influence on the mechanical properties of the hybrid resin and offered no added improvement in the VS and DC. The best performance of a composite resin containing BisS-GMA and SOC-modified epoxy was achieved with 2wt% DPIHFP. The results also indicated that the resin containing BisS-GMA was superior to that containing Bis-GMA in terms of VS, DC and CS.