Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
Alexandria University, Alexandria, Egypt.
Biomed Res Int. 2021 Mar 24;2021:5544196. doi: 10.1155/2021/5544196. eCollection 2021.
The aim of this study was to evaluate the protective effect of using four different fluoride bioactive enamel sealers against an acidic erosion challenge.
A sample of 50 freshly extracted sound upper premolars had their buccal surface bonded to 50 orthodontic brackets using Transbond PLUS color change adhesive; the first four groups had four compositions of fluoride bioactive glasses based on 37 mol% SiO, 43.9-53.9 mol% CaO, 6.1 mol% PO and CaF, and 0-10 mol% of NaO applied to their surfaces and the fifth group served as control (which was not treated by any bioactive sealer). All specimens were challenged by 1% citric acid for 18 minutes which was stirred by a magnetic stirrer. The enamel surfaces next to the orthodontic brackets were examined by SEM. The Wilcoxon signed-rank test was used to compare the area covered by the fluoride bioactive pastes before/after erosion ( < 0.05). Samples from the layer formed on top of the examined teeth were tested before/after erosion to be examined by the attenuated total reflectance Fourier-transform infrared spectroscopy (FTIR/ATR).
The FTIR/ATR test showed that fluoride bioactive pastes' applications resulted in the formation of a hydroxyapatite-rich layer; the SEM analysis showed that the aforementioned layer significantly resisted erosion challenge when compared to the control group ( < 0.05).
Fluoride bioactive pastes can efficiently protect the enamel surfaces next to orthodontic brackets from acidic erosion challenges.
本研究旨在评估四种不同氟生物活性釉质密封剂对酸性侵蚀挑战的保护作用。
采集 50 颗新鲜拔除的上颌前磨牙，将其颊面用 Transbond PLUS 变色粘合剂黏附于 50 个正畸托槽上；前四组样本的表面涂有四种基于 37mol%SiO、43.9-53.9mol%CaO、6.1mol%PO 和 CaF，以及 0-10mol%NaO 的氟生物活性玻璃组合物，第五组作为对照组（未用任何生物活性密封剂处理）。所有样本均用 1%柠檬酸进行 18 分钟的侵蚀挑战，并用磁力搅拌器搅拌。用扫描电子显微镜（SEM）检查紧邻正畸托槽的牙釉质表面。用 Wilcoxon 符号秩检验比较侵蚀前后氟生物活性糊剂覆盖的面积（ < 0.05）。对检查牙齿表面形成的层进行衰减全反射傅里叶变换红外光谱（FTIR/ATR）测试，以比较侵蚀前后的结果。
FTIR/ATR 测试显示，氟生物活性糊剂的应用导致形成富含羟基磷灰石的层；SEM 分析显示，与对照组相比，上述层显著抵抗了酸性侵蚀挑战（ < 0.05）。
氟生物活性糊剂能有效保护正畸托槽附近的牙釉质表面免受酸性侵蚀挑战。
