3种黏固剂与根管牙本质粘接界面的扫描电镜观察

目的通过观察黏固剂与根管牙本质的粘接界面,比较各种黏固剂的粘接性能。方法将15颗牙分成3组,分别用Rely X luting、Panavia F、Paracore 5 mL粘接纤维桩,实验牙纵剖后,置于扫描电镜下观察纤维桩冠1/3、中1/3及根尖1/3处牙本质黏固剂界面,并分别测量混合层厚度。结果1组牙本质黏固剂界面未发现明显混合层,2组与3组可发现明显混合层,且3组可发现树脂突及粘接性侧枝。从根尖方向冠方,1组粘接界面裂隙逐渐缩小,而2组与3组混合层逐渐增厚。结论全酸蚀树脂黏固剂与牙本质结合紧密,粘接性能较树脂改良型玻璃离子黏固剂、自酸蚀树脂黏固剂优越。

Bonding interfaces of three kinds of cements and root canal dentin: An scanning electron microscope observation

Objective To compare the bonding properties of three kinds of cements by observing the bonding interfaces of cements and root canal dentin. Methods 15 extracted mandibular premolars were divided into 3 groups, and were cemented by Rely X luting, Panavia F and Paracore 5 mL, respectively. Each tooth was sectioned into two parts and the dentin-cement interfaces at the coronal, middle and apical parts of the fiber post were oberved by scanning electron microscope (SEM). The length of hybrid layer was also recorded. Results Hybrid layer was not clearly found in group one, which could be seen on the dentin-cement interfaces of group two and three. Resin tags and lateral adhesives were also observed in group three. From the apical to the coronal part, microgaps seemed gradually smaller in group one, while the hybrid layer became thicker in both group two and three. Conclusion The total-etch resin cement bounds tightly with dentin, and owns a more superior bonding property than self-etch resin cement and resin modified glass ionomer cement.