关键词: 纤维桩, 粘接强度, 推出试验, 树脂粘接系统

Abstract:

Abstract： Objective To evaluate the bonding strength of fiber posts cemented to root canals of two resin adhesive systems， as well as the bonding strength between two resin adhesive systems. To offer the rational selection on how to get the best bonding strength when using the resin adhesive systems in post-cores restoration during clinical practice. Methods A total of 30 second premolars which were simple root canal with similar shape and size were selected.The teeth were randomly devided into 3 groups after endodontic treatment，10 samples in each group.Luxacore and 3M Unicem resin were used respectively and at the same time to bond fiber-posts.The roots were cut into 2.0 mm-thick sections；all the sections were tested by push-out test which was performed with a universal testing machine.The bonding strength values were compared，and fracture modes of interface were observed using stereomicroscope. Results significant differences existed among 3 groups. There was statistically significant difference between group C and group A，as well as group C and group B（P＜0.05），but no significant difference between group A and group B（P＞0.05）.The major fracture mode of group A and B was bonding failure between cements and dentine，but on the other side，fracture mode of group C was almost the bonding failure between two cements. Conclusion The bonding strengths between two cements are lower than either one’s bonding strength which cement to dentine or fiber-posts.

Key words: fiber post, bonding strength, push-out test, resin adhesive system