Chemical bond of 4-META resin with enamel and dentin

将4-META树脂对牛牙釉质的粘附试样浸泡在37℃的水中。从牛牙釉质表面剥离4-META树脂膜。利用化学分析电子能谱（ESCA）对剥离后树脂膜的粘附界面进行了分析，显示出较宽的ca2p光谱。Ca - 2p光谱分离出钙的两种化学状态，状态I和状态II。羟基磷灰石（HAp）的ESCA研究表明，状态I是由钙的化学状态HAp产生的。邻苯二甲酸钙作为标准样品进行ESCA分析，澄清未知态II。邻苯二甲酸钙与羟基磷灰石（1:1）混合试样的Ca - 2p光谱与去皮后的4-META树脂的光谱相似。结果表明，在牛牙釉质与4-META树脂的粘附界面上，与邻苯二甲酸钙的化学状态相似。用ESCA分析了人牙与4-META树脂之间的粘附界面，阐明了化学键的证据。人的牙釉质和牙本质被磨成直径几十微米。4-META树脂与牙粉固化后进行ESCA分析。4-META树脂与人牙反应层的Ca - 2p光谱较HAp略宽。反应层结构与邻苯二甲酸钙相似。

The adhesion specimen of bovine enamel with 4-META resin was immersed in water at 37ﾟC.The 4-META resin film was peeled from bovine enamel surface. The adhesion interface of the peeled resin film was analyzed by Electron Spectroscopy for Chemical Analysis (ESCA), showing a broad spectra fo Ca 2p. The Ca 2p spectrawas separated two chemical states of calcium, state I and state II.ESCA study of hydroxypatite (HAp) that the state I results from calcium chemical state of HAp. Calcium phthalate as a standard specimen was analyzed to clarify the unknown state II by ESCA.Ca 2p spectra measured from mixed specimen of calcium phthalate and HAp (1 : 1) shown a similar spectra to the spectra obtained from the peeled 4-META resin.It is shown that a resembled chemical state with calcium phthalate realizes at the adhesion interface between bovine enamel and 4-META resin.Adhesion interface between human tooth and 4-META resin was also analyzed to elucidate the evidence of the chemical bond by ESCA.Human enamel and dentin were grinded into several tens micrometer in diameter. ESCA analysis was done after curing of 4-META resin with the tooth powder.Ca 2p spectra obtained from reaction layr of 4-META resin with human tooth has slightly wide as compared to HAp. Similar structure to Ca-phthalate was estimated in the reaction layr.