Azmy Emad, Al-Kholy Mohamed Reda Zaki, Gad Mohammed M, Al-Thobity Ahmad M, Emam Abdel-Naser M, Helal Mohamed Ahmed
Elmarg Students' Clinic, General Authority of Health Insurance, Western Elmarg Area, Cairo, Egypt.
Department of Removable Prosthodontics, Faculty of Dental Medicine, Al-Azhar University, AlmokhyamAldaem St., Nasr Road, 11884 Nasr City, Cairo, Egypt.
Int J Dent. 2021 Nov 11;2021:5861848. doi: 10.1155/2021/5861848. eCollection 2021.
The effect of beverages on nanocomposite denture base materials is neglected. Therefore, this study aimed to investigate the influence of different beverages (coffee, tea, cola, and mineral water) on the color stability of nanoparticles-modified denture base materials (DBMs).
A total of 280 specimens ( = 10/group) were prepared from heat-polymerized acrylic resin modified with different concentrations (3% and 7%) of zirconium dioxide (nano-ZrO), titanium dioxide (nano-TiO), and silicon dioxide (nano-SiO) nanoparticles, while 0% was taken as a control. Color change (∆E) of the specimens was evaluated after simulating 6-month immersion time in four commonly used beverages, coffee, tea, cola, and mineral water, as experimental groups. Color stability was measured using a spectrophotometer, and then values were converted to National Bureau of Standards units (NBS units). The one-way ANOVA test was applied to compare color change (ΔE) results followed by Bonferroni's post hoc test ( = 0.05).
The results showed that the heat-polymerized acrylic resin modified with different types of nanoparticles showed lower color changes after being immersed in beverage solutions compared to the unmodified group ( < 0.001), so the color stability of heat-polymerized acrylic resin was significantly enhanced by the addition of several nanoparticles; nano-ZrO showed the lowest ΔE followed by nano-TiO and then nano-SiO. Regardless of the filler type, 3% concentration showed lower mean ΔE than 7% concentration. Regarding the beverage solutions, the greatest color change was found in the coffee group followed by tea and cola, while water showed the least changes.
Modification of heat-polymerized acrylic resin with certain amounts of nano-ZrO, nano-TiO, and nano-SiO may be useful in improving color stability.
饮料对纳米复合义齿基托材料的影响被忽视了。因此，本研究旨在探讨不同饮料（咖啡、茶、可乐和矿泉水）对纳米颗粒改性义齿基托材料（DBM）颜色稳定性的影响。
用不同浓度（3%和7%）的二氧化锆（纳米ZrO）、二氧化钛（纳米TiO）和二氧化硅（纳米SiO）纳米颗粒改性的热聚合丙烯酸树脂制备了总共280个试样（每组10个），同时以0%作为对照。在模拟将试样浸泡在咖啡、茶、可乐和矿泉水这四种常用饮料中6个月的时间后，作为实验组评估试样的颜色变化（ΔE）。使用分光光度计测量颜色稳定性，然后将数值转换为国家标准单位（NBS单位）。应用单因素方差分析来比较颜色变化（ΔE）结果，随后进行Bonferroni事后检验（α = 0.05）。
结果表明，与未改性组相比，用不同类型纳米颗粒改性的热聚合丙烯酸树脂在浸泡于饮料溶液后颜色变化较小（P < 0.001），因此添加几种纳米颗粒可显著提高热聚合丙烯酸树脂的颜色稳定性；纳米ZrO的ΔE最低，其次是纳米TiO，然后是纳米SiO。无论填料类型如何，3%浓度的平均ΔE低于7%浓度。关于饮料溶液，咖啡组的颜色变化最大，其次是茶和可乐，而水的变化最小。
用一定量的纳米ZrO、纳米TiO和纳米SiO改性热聚合丙烯酸树脂可能有助于提高颜色稳定性。
