Šimunović Luka, Čekalović Agović Sara, Marić Antun Jakob, Bačić Ivana, Klarić Eva, Uribe Flavio, Meštrović Senka
Department of Orthodontics, School of Dental Medicine, University of Zagreb, 10000 Zagreb, Croatia.
School of Dental Medicine, University of Zagreb, 10000 Zagreb, Croatia.
Polymers (Basel). 2024 Apr 11;16(8):1067. doi: 10.3390/polym16081067.
The significant rise in the use of clear aligners for orthodontic treatment is attributed to their aesthetic appeal, enhancing patient appearance and self-confidence. The aim of this study is to evaluate the aligners' response to common staining agents (coffee, black tea, Coca-Cola, and Red Bull) in color and chemical stability. Polyurethane-based thermoformed and 3D-printed aligners from four brands were exposed to common beverages to assess color change using a VITA Easyshade compact colorimeter after 24 h, 48 h, 72 h, and 7 days, as well as chemical stability using ATR-FTIR spectroscopy. The brand, beverage, and manufacturing method significantly influence color stability. ATR-FTIR analysis revealed compositional differences, with variations in response to beverage exposure affecting the integrity of polymer bonds. Color change analysis showed coffee as the most potent staining agent, particularly affecting Tera Harz TC85 aligners, while ClearCorrect aligners exhibited the least susceptibility. 3D-printed aligners showed a greater color change compared to thermoformed ones. Aligners with a PETG outer layer are more resistant to stains and chemical alterations than those made of polyurethane. Additionally, 3D-printed polyurethane aligners stain more than thermoformed ones. Therefore, PETG-layered aligners are a more reliable choice for maintaining the aesthetic integrity of aligners.
正畸治疗中使用透明矫治器的情况显著增加，这归因于其美学吸引力，能够提升患者的外观和自信心。本研究的目的是评估矫治器在颜色和化学稳定性方面对常见染色剂（咖啡、红茶、可口可乐和红牛）的反应。将四个品牌的聚氨酯基热成型和3D打印矫治器暴露于常见饮料中，在24小时、48小时、72小时和7天后，使用VITA Easyshade紧凑型色度仪评估颜色变化，并使用衰减全反射傅里叶变换红外光谱（ATR-FTIR）评估化学稳定性。品牌、饮料和制造方法对颜色稳定性有显著影响。ATR-FTIR分析揭示了成分差异，对饮料暴露的反应变化影响了聚合物键的完整性。颜色变化分析表明，咖啡是最有效的染色剂，尤其影响Tera Harz TC85矫治器，而ClearCorrect矫治器的敏感性最低。与热成型矫治器相比，3D打印矫治器的颜色变化更大。具有聚对苯二甲酸乙二醇酯二醇（PETG）外层的矫治器比聚氨酯制成的矫治器更耐污渍和化学变化。此外，3D打印的聚氨酯矫治器比热成型的更容易染色。因此，PETG层矫治器是保持矫治器美学完整性的更可靠选择。
