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在离体牙上充填８９─１后牙充填材料（牙体酸蚀和未酸蚀）及其它后牙充填材料，利用扫描电镜观察充填材料与牙体之间的粘连情况，并将图像进行计算机处理，分别计算不同材料与牙体之间的缝隙，了解８９─１材料的密合度。结果表明：８９─１材料与牙体间的缝隙最小，证明该材料的线膨胀系数小于目前常用的后牙充填材料。而牙体酸蚀后，粘连效果更佳。提示在临床应用时，尽可能先对牙体作酸蚀处理。
The 89 - 1 posterior tooth filling material (tooth erosion and non-acid erosion) and other posterior filling materials were placed on the isolated teeth. The adhesion between the filling material and the tooth was observed by scanning electron microscopy, and the images were computerized Treatment, were calculated between the different materials and the gap between the teeth to understand the 89 ─ 1 material adhesion. The results show that the gap between 89-1 material and the tooth body is the smallest, which proves that the linear expansion coefficient of this material is less than that of the commonly used posterior filling material. After the tooth erosion, the adhesion effect is better. Tip in clinical application, as far as possible before the tooth for acid treatment.