Tziafa Christina, Zinelis Spiros, Makou Margarita, Eliades Theodore, Eliades George
Department of Biomaterials, School of Dentistry, University of Athens, Athens, Greece.
World J Orthod. 2010 Winter;11(4):398-403.
To investigate the surface morphology, structure, molecular and elemental composition, and hardness of plastic brackets exposed to fluoride solutions.
Two types of plastic brackets (Silkon Plus and SpiritMB) were exposed to three fluoride solutions 10 times for 1 minute each and then subjected to attenuated total relectance-Fournier transform infrared (ATR-FTIR) spectroscopy, scanning electron microscopy (SEM), x-ray energy dispersive microanalysis (EDS), and Vickers hardness (HV) testing. Hardness data were analyzed via two-way ANOVA and Tukey tests at the .05 level of significance with brackets and fluoride solution as predictors.
ATR-FTIR spectroscopy showed that both bracket types consisted of polycarbonate. After treatment with acidulated phosphate fluoride, an increased contribution of -OH peaks at 3,200 cm-1(stretching [str]) and 1,640 cm-1 (a type of vibration [b]) was observed in both brackets. SEM revealed that the acidulated phosphate fluoride solution had a strong effect on the morphology and surface structure of the two brackets; a general deterioration with projections of the reinforcing fibers was observed. EDS showed evidence of aluminum, calcium, silicon, magnesium, and titanium, which could be attributed to the reinforcing glass fiber constituents. Hardness ranged in the order of 20 HV with no difference among the two bracket types and the three fluoride exposures.
Repeated exposure of plastic brackets to fluoride solutions has a pronounced effect on their structure and morphology, but not their hardness.
研究暴露于氟溶液中的塑料托槽的表面形态、结构、分子和元素组成以及硬度。
将两种类型的塑料托槽（Silkon Plus和SpiritMB）暴露于三种氟溶液中，每次暴露1分钟，共暴露10次，然后进行衰减全反射傅里叶变换红外光谱（ATR-FTIR）分析、扫描电子显微镜（SEM）分析、X射线能量色散微分析（EDS）和维氏硬度（HV）测试。以托槽和氟溶液作为预测因子，通过双向方差分析和Tukey检验在0.05的显著性水平下分析硬度数据。
ATR-FTIR光谱显示两种托槽类型均由聚碳酸酯组成。用酸性磷酸氟处理后，在两种托槽中均观察到3200 cm-1（拉伸[str]）和1640 cm-1（一种振动[b]）处-OH峰的贡献增加。SEM显示酸性磷酸氟溶液对两种托槽的形态和表面结构有强烈影响；观察到增强纤维突出导致的普遍劣化。EDS显示存在铝、钙、硅、镁和钛，这可归因于增强玻璃纤维成分。硬度范围约为20 HV，两种托槽类型和三种氟暴露之间没有差异。
塑料托槽反复暴露于氟溶液对其结构和形态有显著影响，但对其硬度没有影响。
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