Department of Orthodontics, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, TX, USA.
Department of Restorative Dentistry and Prosthodontics, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, TX, USA.
J Orthod. 2021 Sep;48(3):241-249. doi: 10.1177/14653125211001079. Epub 2021 Mar 15.
To evaluate the colour stability of polymeric resins that could be used to 3D-print orthodontic brackets.
In vitro, laboratory study.
Disc-shaped specimens were fabricated via 3D printing using three resins: Dental LT; Dental SG; and Clear. Five conditions were evaluated for each resin (n = 10 per treatment per resin) to assess its corresponding effect on colour and translucency: immersion in (1) red wine, (2) coffee, (3) tea and (4) distilled water (control), and (5) exposure to accelerated aging. Colour and translucency measurements were made before and after exposure using a spectrophotometer. Mean colour differences (ΔE) and changes in translucency parameter (ΔTP) were calculated for each sample using the CIEDE2000 colour difference formula.
Statistically significant effects of the resin material, the treatment condition and interactions effects of material and condition were observed for ΔE and ΔTP ( < 0.001). The most pronounced changes in colour (ΔE) were a result of the staining effects of wine on all three resins, ranging from 14.5 ± 0.6 to 20.8 ± 1.2. Dental LT, Dental SG and Clear resins all showed changes in colour when exposed to certain staining agents. Dental SG and Clear resins exhibited changes in colour with aging, while the colour of Dental LT resin remained stable with aging.
The colour changes of the resins investigated does not support their use in 3D-printed aesthetic bracket applications.
评估可用于 3D 打印正畸托槽的聚合树脂的颜色稳定性。
体外，实验室研究。
通过 3D 打印制作圆盘状样本，使用三种树脂：Dental LT、Dental SG 和 Clear。每种树脂评估了五个条件（每个处理组各 10 个样本），以评估其对颜色和半透明度的相应影响：（1）红酒、（2）咖啡、（3）茶和（4）蒸馏水（对照）和（5）加速老化。使用分光光度计在暴露前后测量颜色和半透明度。使用 CIEDE2000 颜色差异公式为每个样本计算平均颜色差异（ΔE）和半透明度参数变化（ΔTP）。
观察到树脂材料、处理条件以及材料和条件的相互作用对 ΔE 和 ΔTP 有统计学显著影响（<0.001）。所有三种树脂的葡萄酒染色效果导致颜色变化（ΔE）最为明显，范围从 14.5±0.6 到 20.8±1.2。Dental LT、Dental SG 和 Clear 树脂在暴露于某些染色剂时均显示出颜色变化。Dental SG 和 Clear 树脂随着老化而发生颜色变化，而 Dental LT 树脂的颜色则保持稳定。
所研究的树脂的颜色变化不支持其在 3D 打印美学托槽应用中的使用。
