期刊
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
卷 126, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmbbm.2021.104993
关键词
CAD/CAM; 3D printing; Additive manufacturing; Post-curing; Staining; Color stability
资金
- Seoul National University Dental Hospital Research Fund [01-2019-0013]
The post-curing time of 3D-printed resin for dental restorations significantly affects color stability and related properties such as degree of conversion, surface roughness, water contact angle, water sorption, and water solubility. Increasing post-curing time improves color stability, enhances degree of conversion, and decreases water contact angle.
This study investigated the effect of post-curing time on the color stability and related properties, such as degree of conversion (DC), surface roughness, water contact angle, water sorption (W-sp), and water solubility (W-sl) of 3D-printed resin for dental restorations. The 3D-printed specimens were divided into four groups according to the post-curing time (0, 5, 10, and 20 min). Color changes (Delta E-00) of the specimens immersed in aging media were measured using a spectrophotometer at different aging times. The DC of the resin was measured using a FTIR. The surface roughness (Ra) of the resin immersed in coffee was measured at different aging times. Water contact angle was evaluated using the sessile drop method, and W-sp and W-sl were tested according to the ISO 4049:2019. The Delta E-00 values of the specimens immersed in coffee and red wine decreased with increasing postcuring time. As the post-curing time increased up to 10 min, the DC increased and water contact angle decreased. The Ra value of the group without post-curing (0 min) increased gradually for 30 days, except between 7 and 15 days. However, when the post-curing time increased to greater than 10 min, no apparent change in Ra value was detected. The W-sp and W-sl of the group without post-curing were significantly lower and larger than that of the other groups, respectively. The longer the post-curing time of the tooth-colored 3D-printed resin, the better the color stability. The post-curing time of the 3D-printed resin affected the DC, surface roughness after aging in the staining media, water contact angle, water sorption, and water solubility.
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