In this study, dental 3D printer temporary crown resin was prepared according to the changes of catalyst type oligomer content. Urethane diacrylate (UDMA) and the monomer trimethylolpropane trimethacrylate (TMPTA) were used for the oligomer used in the production of temporary crown resin, and Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (BAPO) and Diphenyl (2 4 6 -Trimethylbenzoyl)phosphine oxide (TPO) was used and a temporary crown resin was prepared using titanium dioxide (TiO2) powder as a pigment. FT-IR analysis of the prepared resin, viscosity measurement, flexural strength measurement, and 3-dimensional accuracy measurement The physical properties were measured through.
1. It was confirmed that the viscosity increased as the UDMA content increased. As the content of oligomer UDMA increases, it affects the viscosity, but the increase is not a problem for 3D printing out put, so the UDMA content of 75% is the most suitable.
2. As the UDMA content increased, it was confirmed that the flexural strength of the resin printouts for temporary crowns increased. UDMA 75% showed the highest flexural strength of 145 MPa, and it was confirmed that it could be used as a temporary crown resin by meeting the requirements of 50 MPa or more, the requirements presented by ISO 10477:2018. In addition, it was confirmed that all three-dimensional accuracy data showed 90% accuracy.
3. It was confirmed that there was no change in the physical properties of viscosity and flexural strength as the content of the photoinitiator increased. However, it was confirmed that the flexural strength and 3D accuracy data of TPO were lower than that of photoinitiator BAPO. In the case of photoinitiator TPO, photoinitiator TPO is a photoinitiator with a UV length of 385 nm. It is judged appropriate to proceed with the output.