Influence of UDMA and TEGDMA Concentration on Morphology, Bonding, Thermal and Mechanical Properties of UV-Cured Resin

Abstract

In this work, urethane dimethacrylate (UDMA) was used as dental resin as an non-toxic alternative to Bisphenol A-glycidyl methacrylate (Bis-GMA). Additionally, UDMA combine with triethylene glycol dimethacrylate (TEGDMA) monomer with various concentration ratio, meanwhile camphorquinone (CQ) and diphenyl-(2,4,6-trimethylbenzoyl) phosphine (TPO) as photoinitiator. First, UDMA:TEGDMA with ratio of 40:60, 50:50, 60:40, 70:30 and 80:20 wt.% was prepared. Second, the solution was ultrasonic for 15 min with introduction of CQ and TPO (1:2 wt%). Third, irradiation of UV LED with wavelength of 375 nm for 2 min to initiate polymerization reaction of monomers. Scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), thermogravimetric analyzer (TGA) and mechanical properties were used to investigate the morphology, chemical bonding of polymerization reaction, decomposition temperature and tensile strength. Based on our findings, we found that that UDMA:TEGDMA ratio of 50:50 wt% demonstrates uniform and smooth surface, high degree of conversion, and good mechanical strength, which is promising for dental resin.