目的 比较不同粘接系统粘接2种纤维桩后在桩道不同深度的粘接界面形态和界面破坏方式.方法 选取36颗新鲜上颌前磨牙,将其分成A、B、C、D组,A组:自粘接树脂黏固剂和POPO玻璃纤维桩;B组:全酸蚀粘接系统和POPO玻璃纤维桩;C组:自粘接树脂黏固剂和Para Post玻璃纤维桩;D组:全酸蚀粘接系统和Para Post玻璃纤维桩.根管充填、桩道预备后粘接纤维桩于根管中.制备厚约1 mm薄片推出实验试样,万能力学测试机进行加载,体视显微镜观察粘接界面气泡率、裂缝率和破坏方式.结果 对于粘接界面树脂层气泡率,B组(64.2%)、D组(66.7%)显著高于A组(5.8%)、C组(13.7%)(P<0.001).D组粘接界面裂缝率(41.2%)显著高于A组(13.5%)和C组(11.8%)(P<0.008 3).除A组与B组间外(P=0.69),其余各组试件破坏方式间差异有统计学意义(P<0.008 3).结论 粘接界面树脂层气泡率与使用的树脂粘接系统有关;纤维桩-树脂-牙本质粘接界面形态特征与破坏方式间存在差异,2个界面的性能共同决定纤维桩桩道内的粘接固位能力;纤维桩和粘接系统间存在显著的相互作用.%Objective To investigate the correlation of morphological characteristics and failure modes of two types of glass-fiber posts luted with self-adhesive resin cement and etch-and-rinsc adhesive system. Methods Thirty-six intact single-rooted premolars were collected and removed the crown. After root canal therapy, teeth were randomly divided into 4 groups. Group A: Self-adhesive with POPO fiber post. Group B: Etch-and-rinse with POPO fiber posts, Group C: Self-adhesive with Para Post Group D: Etch-and-rinse with Para Post. Each root was sectioned into six 1 mmthick serial slices and a push-out test was performed. The dentin-cement-post adhesive interface of each specimen and failure modes after fracture were evaluated by stereomicroscope observation. Results Interface morphology observe indicated that voids present in group B(64.2％) and D(66.7％) were significantly higher than group A(5.8％) and C (13.7％) (P＜0.001). Interface gaps appeared at the resin-dentine interface in group D (41.2％) were significantly higher than group A(13.5％) and C(11.8％)(P＜0.008 3), and the failure modes in each group were significantly different (P＜0.008 3) except for group A and B (P=0.69). Conclusion Voids present in cement layer were associated with the luting agent involved. Morphological characteristics of the fiber post-resin luting agent-root dentin adhesive interface were discrepant with failure modes in different root region. There were interaction between adhesive systems and fiber posts.
展开▼
