牙本质不同表面状态对其粘接界面影响的扫描电镜观察

目的研究牙本质表面的干燥或湿润状态对牙本质粘结界面微观结构的影响。方法用扫描电镜观察和比较两类5种粘结系统在干燥或湿润的牙本质表面进行粘结时形成的粘结界面的微观结构。结果湿粘结时5种粘结系统在粘结界面获得良好的渗透图象;干燥粘结时,两种以丙酮为溶剂的粘结系统在干燥粘结时形成的粘结界面,与湿粘结时有明显的区别,混合层较薄,并有明显的不完全渗透的结构和混杂层的形成;以酒精和水为溶剂的粘结系统在两种不同粘结状态时粘结界面的超微结构没有明显的区别。结论使用新型的湿粘结系统时,牙本质粘结表面应该保持一定的湿润度,以保证粘结剂在粘结界面的良好渗透,获得较高的粘结强度。

Scanning electron microscope observation of the effect of different dentin bonding surfaces on the bonding interface

To study the microstructural influence of dry or wet dentin bondin g surface on the dentin bonding interface, five wet bonding systems were used to bond Chrisma B20 resin with dry or moist dentin surface with scanning electron m icroscope. All these systems were found to be well able to infiltrate into the dentin bonding interface on wet dentin surface, and signifi cant changes occurred in the bonding interface when acetone-based adhesives wer e applied on dry dentin surfaces, demonstrating thinner hybrid layer and t he formation of partially hybrid region, while alcohol-and water-based adhesive s showed no changes. The necessity of moist dentin surface is therefore suggest ed when wet bonding systems are used.