口腔材料学英文中文教学课件.ppt

二、牙本质粘接剂 dentin bonding agents 分类：酸蚀冲洗 etch rinse 和自酸蚀类 self-etch，区别是前者需要单独酸蚀牙本质。 粘接机制： 粘结剂与牙本质形成混合层，与树脂突 resin tag 一起，形成牙本质的粘接 牙本质酸蚀15-20秒， 时间过长过短都不好，唾液，血液污染会严重影响牙本质的粘接 术后敏感 post-operative sensitivity :自酸蚀系统敏感发生少于酸蚀-冲洗系统 酸蚀是关键，酸蚀面保持湿润状态，看上去像是一层发亮的水膜。水过多或者过少都会影响树脂渗入。 树脂谁们丁 resin cements 具有粘固 luting 或粘结性能树脂基复合材料。效果优于无机汀。 树脂水门汀特点： 双重固化 强度高 可以对牙釉质，牙本质，陶瓷，合金进行粘结 溶解度较低，低于无机水门汀 Bonding/adhesion Today, binding material or dental bonding technique are more and more used in dental defect and tooth missing repair process .It can reduce the cutting of tissue of tooth ,utmost to preserve the healthy tooth tissue ,Improve the bonding strength between hard tissue and the restoration, improve the adaptation of the bonding interface, and long fatigue measurement of fixed prostheses. Bonding (adhesion) refers to a phenomenon that two same or different types of solid substance can produce stable combination by another substance between the two tables It is a kind of material that can bond one or more solid substance, called the bonding agents (adhesives). The solid material is called adher-end. The material that bonding dental prosthesis or dental restorative materials to the surfaceof dental hard tissue called binder. Adhesives and other auxiliary materials, such as etching agent, totally referred as dental bonding material 1 The mechanism of adhesion formation Adhesive combined one side with dental tissue, the other side with the filling material. There are several theories about the mechanism of adhesion formation. (1)Theory of chemisorption The theory holds that the reason why it can form a kind of powerful force between some of the adhesive and the adherend is that there has chemical bond between the adhesive and the adherend. Adhesive bonds are involved in covalent bond and ionic bond. Covalent bond can be relatively high, is hard to be damaged, the ionic bond of insoluble or poorly soluble substances are very stable. Undoubtedly If the adhesive with the sti