Division of Biomaterials and Bioengineering, School of Dentistry, Health Sciences University of Hokkaido.
Faculty of Health Sciences, Department of Oral Health Sciences, Osaka Dental University.
Dent Mater J. 2021 May 29;40(3):683-688. doi: 10.4012/dmj.2020-229. Epub 2021 Jan 30.
X-ray photoelectron spectroscopy (XPS) is used to analyze 4-META resin and enamel that are debonded at an adhesive interface. The XPS spectra showed two chemical states for Ca: one resulted from Ca of hydroxyapatite and the other, an unknown chemical state, suggested that Ca was chemically bonded with 4-META. We postulate that for a chemical reaction of 4-META and hydroxyapatite, the chemical structure of carboxyl groups will resemble that of calcium phthalate. Hence, calcium phthalate was used as a reference material. Additionally, the spectra obtained from the adhesive interface and the mixture of calcium phthalate with hydroxyapatite particles were compared using peak deconvolution analysis. XPS analysis revealed that the chemical bond of 4-META with enamel resembled the chemical state of Ca in calcium phthalate. Consequently, we suggest that Ca of the enamel and the carboxyl group of 4-META were chelate-bonded at the interface.
X 射线光电子能谱（XPS）用于分析在黏合界面处脱黏的 4-META 树脂和牙釉质。XPS 谱显示 Ca 有两种化学状态：一种源自羟磷灰石中的 Ca，另一种未知的化学状态表明 Ca 与 4-META 发生了化学键合。我们推测，对于 4-META 和羟磷灰石的化学反应，羧基的化学结构将类似于邻苯二甲酸钙。因此，邻苯二甲酸钙被用作参考材料。此外，还使用峰分解分析比较了从黏合界面和邻苯二甲酸钙与羟磷灰石颗粒混合物获得的光谱。XPS 分析表明，4-META 与牙釉质的化学键合类似于邻苯二甲酸钙中 Ca 的化学状态。因此，我们推测牙釉质中的 Ca 和 4-META 的羧基在界面处形成了螯合键。
