| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | B. 나노화학/바이오 재료 분과 |
| 제목 | Fabrication of compositionally graded zirconia products with high translucency using digital light processing (DLP) technique |
| 초록 | Artificial zirconia-based crowns have been extensively used in the field of dentistry due to the characteristics of zirconia including excellent mechanical properties, biocompatibility, and aesthetic similarity to the human teeth. Most of the research was conducted by conventional CAD/CAM (computer-aided design/computer-aided manufacturing) based machining method to fabricate precisely controlled structures. However, performing such methods had some issues; for example, large amount of zirconia debris was generated during machining process, as well as milling tools being frequently damaged by high hardness, and long processing time was required for the sake of low toughness of general ceramics. As alternative methods, series of AM (additive manufacturing) techniques were adopted after the advent of 3D printing. Especially, DLP (digital light processing), which is one kind of 3D printing technique using photo-sensitive ink and UV light source, has multiple advantages compared to conventional methods; increased yield rate of production, high manufacturing accuracy and fast fabrication time. However, recent studies which focus on fabricating artificial crowns with 3D printing are concentrated in utilizing single zirconia source, which could not reflect aesthetical properties of natural human teeth. Since natural teeth show graded shade and translucency, multi-material system should be applied. In this research, two photo-curable zirconia shaded suspensions were 3D printed with controlled extrusion, uniform mixing, followed by photocuring process using UV source with pre-designed mask in a layer-by-layer manner to fully manufacture compositionally gradient structure. After printing, as-printed zirconia green products were heat treated to achieve fully densified gradient structures. Various mechanical, optical tests were performed including in-vitro marginal fit evaluation to fully investigate zirconia specimens printed using compositionally gradient system, and to assess the possibility of shade-gradient zirconia crown for clinical usage. Therefore, in this research, we propose advanced system of DLP 3D printing technique which generates compositionally graded zirconia products resulting in gradual shade transition with high translucency, further being the cornerstone for fabricating gradient structure using multi-materials via 3D printing technique in various fields. |
| 저자 | 김규남, 최규빈, 정재민, 고영학 |
| 소속 | 고려대 |
| 키워드 | 3D printing; zirconia; gradient; compositionally gradient; additive manufacturing; dentistry |
