다양한 표면처리에 따른 착색된 3D 프린팅 레진의 물리ㆍ기계적 특성 변화 연구

Abstract

This study aims to evaluate the color changes and surface properties of discolored 3D printing resin after applying different surface treatments, and to recommend appropriate methods for removing extrinsic discoloration in clinical practice. After staining the 3D-printed specimens, self-whitening strips (SW), professional polishing agents (PP), and plasma treatment (P) were applied. The plasma treatments were administered for 4 minutes (P4), 8 minutes (P8), and 12 minutes (P12). Color changes were measured using a spectrophotometer, gloss was measured with a gloss meter, surface hardness was evaluated using a Shore hardness tester, surface roughness was assessed with a surface roughness tester, and the surface microstructure was observed using a scanning electron microscope. The SW, P8, and P12 groups showed the most significant color changes, while the surface hardness of P12 was closest to that before staining. Gloss was highest in the SW and P12 groups, and there were no significant differences in surface roughness among the treatment groups. No significant differences in gloss or surface roughness were observed compared to before staining, and the impact on surface hardness was minimal. Therefore, the P12 method, which effectively removes discoloration, is recommended. This study is expected to provide valuable data for clinicians on surface treatment methods that effectively remove stains while minimizing the impact on surface properties, thereby maximizing aesthetic results and patient satisfaction.