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首页> 外文期刊>Journal of dentistry >Surface alteration of human tooth enamel subjected to acidic and neutral 30% hydrogen peroxide.
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Surface alteration of human tooth enamel subjected to acidic and neutral 30% hydrogen peroxide.

机译：人牙釉质的表面蚀变，在酸性和中性30％过氧化氢作用下进行。

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OBJECTIVES: To investigate the effects of acidic and neutral 30% hydrogen peroxide (HP) on human tooth enamel in terms of chemical structure, mechanical property, surface morphology and tooth colour. METHODS: Twenty-seven human dental blocks were obtained from premolars and randomly divided into three groups (n=9): Group acidic HP (30% HP, pH approximately 3.6), Group neutral HP (30% HP, pH approximately 7.0) and Group DW (distilled water, pH approximately 6.8). Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), Raman spectroscopy, atomic force microscopy (AFM) investigation, microhardness test and colour measurements were carried out before and after treatments. ATR-FTIR and Raman spectroscopy were analysed and then the carbonate:mineral ratio (C:M), Raman absolute intensity (RAI), Raman relative intensity (RRI), and laser-induced fluorescence intensity (FI) were obtained for evaluation. RESULTS: The C:M, percentage microhardness and percentage RRI of group acidic HP decreased more significantly than those of group neutral HP (P=0.02, P=0.001, P<0.001, respectively) and group DW (P=0.01, P=0.008, P<0.001, respectively). Whilst group neutral HP and group DW had no statistical difference in above terms (P=0.818, P=0.528, P=0.158, respectively). Significant morphological alterations were observed in group acidic HP. Group acidic HP and neutral HP had no significant difference in percentage FI (P=0.652) and DeltaE (P=0.906). CONCLUSIONS: This study suggested that neutral 30% HP had the same efficiency in tooth bleaching and it caused less deleterious effects on enamel than acidic 30% HP.
机译：目的：从化学结构，力学性能，表面形态和牙齿颜色等方面研究酸性和中性的30％过氧化氢（HP）对人牙釉质的影响。方法：从前磨牙获得二十七个人类牙齿块，并将其随机分为三组（n = 9）：酸性HP组（30％HP，pH约3.6），中性HP组（30％HP，pH约7.0）和DW组（蒸馏水，pH约6.8）。在处理前后进行了衰减全反射傅里叶红外光谱（ATR-FTIR），拉曼光谱，原子力显微镜（AFM）研究，显微硬度测试和颜色测量。分析了ATR-FTIR和拉曼光谱，然后获得碳酸盐：矿物比（C：M），拉曼绝对强度（RAI），拉曼相对强度（RRI）和激光诱导的荧光强度（FI）进行评估。结果：酸性HP组的C：M，显微硬度百分比和RRI百分比分别比中性HP组（P = 0.02，P = 0.001，P <0.001）和DW组（P = 0.01，P = 0.008，P ＜0.001）。而中性HP组和DW组在上述各项方面无统计学差异（分别为P = 0.818，P = 0.528，P = 0.158）。在酸性HP组中观察到明显的形态学改变。酸性HP组和中性HP组的FI百分比（P = 0.652）和DeltaE百分比（P = 0.906）没有显着差异。结论：这项研究表明，中性的30％HP具有与酸性的30％HP相同的牙齿漂白效率，并且对牙釉质的有害影响较小。

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