Comparing Properties of Urethane Dimethacrylate (UDMA) Based 3D Printing Resin Using N-Acryloylmorpholine (ACMO) and Triethylene Glycol Dimethacrylate (TEGDMA) Separately as Diluents

Abstract

The purpose of our study reported here was to investigate the performance of urethane dimethacrylate (UDMA) based 3D printable resin systems when using N-acryloylmorpholine (ACMO) as a diluent. UDMA was mixed with ACMO with a series of mass ratios, and the viscosity, degree of double bond conversion (DC), volumetric shrinkage (VS), flexural strength (FS), and modulus (FM), water sorption (WS) and solubility (SL), hardness, wear resistance, and accuracy thereof the obtained resin systems were studied and compared with triethylene glycol dimethacrylate (TEGDMA) diluted resin systems. The results showed that the ACMO diluted resin systems had a higher viscosity than the TEGDMA diluted resin systems with the same diluent concertation. Replacing TEGDMA with ACMO showed improvement in DC, VS, FS and FM in dry conditions, and the accuracy of 3D printable resin systems. However, the reduction of water resistance and wear resistance would limit the application as dental restoration materials of ACMO diluted 3D printable resin systems. With the aim to improve the water resistance and wear resistance of ACMO diluted 3D printable resin systems, we suggest further research concerned about using a new base resin and optimizing resin composition should be undertaken.