본 연구에서는 methyl methacrylate (MMA)로 표면처리된 실리카 분말을 이용하여 임시치아용 레진을 제조하고, 이를 LCD 타입의 3D 프린터로 임시치아를 출력하여 실리카 분말이 굴곡강도 및 출력 정확도 등의 임시치아의 주요 물성에 미치는 영향을 조사하였다. 임시치아용 레진 제조 시 아크릴 올리고머와 아크릴 모노머로 urethane dimethacrylate (UDMA)와 trimethylolpropane trimethacrylate (TMPTMA)를 각각 사용하였으며, 광개시제로서 phenylbis(2,4,6-trimethylben zoyl)phosphine oxide (BAPO)를 사용하였다. 또한 MMA로 표면 처리된 실리카 분말은 각각 1 μm와 3 μm 크기의 입자를 사용하였다. MMA로 표면 처리된 실리카 분말이 첨가되지 않은 임시치아용 레진은 점도 358.3 cP, 굴곡강도 112.0 MPa, 출력 정확도 ± 25 μm의 물성을 보였으나, 1 μm의 실리카 분말이 첨가된 임시치아용 레진은 점도 598.9 cP, 굴곡강도 191.2 MPa, 출력 정확도 ± 30 μm의 물성을 보여 굴곡강도가 크게 향상되었다.

In this study, a temporary crown resin was fabricated using silica powder surface-treated with methyl methacrylate (MMA), and temporary crown was printed using a LCD-type 3D printer to investigate the effects of the silica powder on the physical properties of the temporary crown, such as flexural strength and printing accuracy. For the fabrication of the temporary crown resin, urethane dimethacrylate (UDMA) was used as an acrylic oligomer, and trimethylolpropane trimethacrylate (TMPTMA) was used as an acrylic monomer. Also, penylbis(2,4,6-trimethylbenzoyl)phosphine oxide (BAPO) was used as the photoinitiator. MMA-treated silica powders with particle sizes of 1 μm and 3 μm were used. The temporary crown resin prepared without MMA-treated silica powder exhibited a viscosity of 358.3 cP, a flexural strength of 112.0 MPa, and a printing accuracy of ±25 μm. In contrast, the resin containing 1 μm MMA-treated silica powder showed a viscosity of 598.9 cP, a flexural strength of 191.2 MPa, and a printing accuracy of ±30 μm, showing a significant improvement in flexural strength.

3D printing Temporary crown resin Silica powder Urethane dimethacrylate Trimethylolpropane trimethacrylate Flexural strength