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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Adhesion/decalcification and mechanisms of acid interactions with human hard tissues
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Adhesion/decalcification and mechanisms of acid interactions with human hard tissues

机译：酸/盐与人体硬组织的粘附/脱钙作用及其机理

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In order to study adhesion/decalcification mechanisms of acid interactions with human hard tissues such as bones and teeth, the chemical interaction of five carboxylic acids (acetic, citric, lactic, maleic, and oxalic) and two inorganic acids (hydrochloric and nitric) with enamel and two synthetic hydroxyapatite (HAp) powders with, respectively, a high and a low crystallinity were analyzed using X-ray photoelectron spectroscopy (XPS), atomic absorption spectrophotometry (AAS), and spectrophotometry (S). X-ray diffraction revealed that the crystallinity of the highly crystallized HAp was considerably higher than that of enamel while the crystallinity of the poorly crystallized HAp was similar to that of dentin and bone. XPS of acid-treated enamel demonstrated for all carboxylic acids ionic bonding to calcium of HAp. AAS and S showed for both HAps that all carboxylic and inorganic acids except oxalic acid extracted Ca significantly more than P, leading to a Ca/P ratio close to that of synthetic HAp (2.16 w/w). Oxalic acid extracted hardly any Ca, but substantially more P, leading to a significantly smaller Ca/P ratio than that of HAp. AAS showed that the calcium salt of oxalic acid hardly could be dissolved, whereas the calcium salts of all the other acids were very soluble in their respective acid solution. These results confirm the adhesion/decalcification concept (AD-concept) previously advanced. Depending on the dissolution rate of the respective calcium salts, acids either adhere to or decalcify apatitic substrates. It is concluded that the AD-concept that originally dictated the interaction of carboxylic acids with human hard tissues can be extended to inorganic acids, such as hydrochloric and nitric acid. Furthermore, HAp crystallinity was found not to affect the adhesion/decalcification behavior of acids when interacting with apatitic substrates, so that the AD-concept can be applied to all human hard tissues with varying HAp crystallinity.
机译：为了研究酸与人体硬组织（例如骨骼和牙齿）相互作用的粘附/脱钙机理，将五种羧酸（乙酸，柠檬酸，乳酸，马来酸和草酸）和两种无机酸（盐酸和硝酸）进行化学相互作用。使用X射线光电子能谱（XPS），原子吸收分光光度法（AAS）和分光光度法（S）分析了搪瓷和两种分别具有高和低结晶度的合成羟基磷灰石（HAp）粉末。 X射线衍射表明，高度结晶的HAp的结晶度明显高于牙釉质，而结晶程度较差的HAp的结晶度与牙本质和骨骼的结晶度相似。酸处理的瓷釉的XPS证明了所有羧酸离子键合到HAp钙上。 AAS和S对HAps均显示，除草酸外，所有羧酸和无机酸提取的Ca明显多于P，导致Ca / P比接近合成HAp（2.16 w / w）。草酸几乎不提取任何Ca，但可提取更多的P，从而导致Ca / P比率明显低于HAp。 AAS表明草酸的钙盐几乎不能溶解，而所有其他酸的钙盐在其各自的酸溶液中都非常可溶。这些结果证实了先前发展的粘附/脱钙概念（AD概念）。取决于各自钙盐的溶解速率，酸会粘附或脱脂脂肪族底物。结论是，最初指示羧酸与人类硬组织相互作用的AD概念可以扩展到无机酸，例如盐酸和硝酸。此外，发现HAp结晶度在与脂肪族基质相互作用时不会影响酸的粘附/脱钙行为，因此AD概念可应用于具有不同HAp结晶度的所有人类硬组织。

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