This study developed a composite resin by mixing Barium glass, treated with a silane coupling agent, into a photocurable resin composition containing synthesized urethane acrylate oligomers. The chemical structure of the synthesized oligomers was confirmed through FT-IR spectroscopy, and the molecular weight was measured using Gel Permeation Chromatography (GPC). The dispersion of barium glass was evaluated using Turbiscan equipment, and the mechanical properties were analyzed using a universal testing machine. Additionally, optimal conditions for 3D printing were established, and the accuracy of the output was assessed through tolerance grading and overlapping 3D image analysis. Furthermore, radiopacity was confirmed by comparing radiographic images with extracted teeth. Experimental results showed that as the content of Barium glass increased, both mechanical strength and dispersion improved, with the highest flexural strength, flexural modulus, and tensile strength observed at 15 wt.%. Moreover, the lowest TSI index was measured under these conditions, confirming the optimal dispersion of Barium glass. The analysis of output accuracy recorded a high precision of over 99.9% while maintaining good dispersion. Radiographic analysis revealed a radiopacity similar to that of dentin compared to actual extracted teeth, and the internal structure was easily observable.

Keywords: Photocurable, Mechanical Properties, 3D-Printing, Nanocomposite, Polyurethane