Nondestructive Analysis of Tooth - Adhesive Interfaces by Surface Sensitive XAFS.

牙科粘合剂是用来将牙科材料粘在牙齿上的。为了获得高的耐久性和粘接强度，有关牙齿(牙釉质/牙本质)-粘接界面的信息是极其重要的。然而，常规的分析方法具有一定的局限性，如破坏性。X射线吸收精细结构(XAFS)是一种光谱方法，它可以用来估算物质中特定原子的各种性质(电子态、外围原子、配位数和键距)。在本研究中，我们分析了羟基磷灰石(HAP)-10-甲基丙烯酰氧基十烷基磷酸二氢(MDP)混合物中钙的化学状态。MDP是一种广泛使用的粘附性单体，表面敏感XAFS技术被应用于HAP/MDP界面的分析。结果表明，HAP-10-MDP界面为薄的MDP-Ca层(约100 nm)，其厚度与处理条件(HAP/MDP溶液的比例和处理时间)有关。

Dental adhesives are used to bond the dental materials to teeth. To obtain high durability and adhesive strength, informations about the tooth (enamel/dentin) - adhesive interface are extremely important. However, conventional analysis methods have some limitations, such as destructive. X-ray absorption fine structure (XAFS), which is one of spectroscopic methods, makes possible to estimate the various properties (electronic state, peripheral atoms, coordination numbers and the bond distance) of a particular atom in the substance. In this study, we analyze the chemical state of Ca in hydroxyapatite (HAp)-10-methacryloyloxydecyl dihydrogen phosphate (MDP) mixture. MDP is widely used as an adhesive monomer.Surface sensitive XAFS techniques are applied for the HAp/MDP interface analysis. As results, we found that HAp - 10-MDP interface is thin MDP-Ca layer ( < 100 nm), and its depth of layer is depend on treatment condition (the ratio of HAp and MDP solution and the treatment period).