桩-粘接剂-根管内壁牙本质界面的拉曼光谱分析

目的本实验采用显微激光拉曼光谱仪观测根管内壁牙本质- 粘接剂- 桩粘接界面的物质过渡变化，了解不同粘接材料与根管内壁牙本质的结合方式，探讨不同粘接剂对桩固位力影响的原因。方法将钛桩和玻璃纤维桩分别使用磷酸锌黏固剂、玻璃离子黏固剂和树脂粘接材料粘着于离体牙根管内，用显微激光拉曼光谱仪分别测量其光谱，并与粘着前粘接底物和粘接剂的光谱进行对比，探讨粘接前后的光谱变化。结果磷酸锌黏固剂- 牙本质和玻璃离子黏固剂- 牙本质界面未见改变，而树脂- 牙本质及树脂- 玻璃纤维桩界面可见明显激光拉曼光谱混合带改变。结论显微激光拉曼光谱仪是研究修复粘接界面的有效手段。不同粘接材料与牙本质结合方式不同，本实验使用的树脂类粘接材料可渗入到根管内壁及玻璃纤维桩材料内。

Raman Spectroscopic Analysis of Post-cement-root Canal Dentin Interface

Objective To examine the compositions of those adhesion modes between luting cements and canal dentin, and to evaluate the dentin-cement-post interface by Laser-Raman spectroscopy. Methods Three representa-tive luting cements(zinc phosphate, glass ionomer and resin cements), two kinds of prefabricated posts(titanium and fiber-glass), six extracted intact human maxillary anterior teeth were used canal dentin after endodontic treatment. Laser-Raman spectroscopy measure of cement, post and canal dentin before and after luting together. Results There are no evident Raman spectra change cross the ZPC/dentin interface and glass ionomer/dentin interface, while cross the resin/dentin interface and resin/glass fiber post interface can be seen special Raman spectra. Conclusion Laser- Raman microspectroscopy is a useful analytical technique for evaluation interface between dentin and luting cements. Resin cement may interact with dentin and glass fiber post.