目的：对比玻璃纤维桩表面经聚多巴胺或硅烷偶联剂处理后与树脂水门汀的微推出粘接强度，探讨玻璃纤维桩表面聚多巴胺化学改性处理对其与树脂水门汀粘接强度的影响。方法：将30支玻璃纤维桩随机分成3组，每组10支，组1为聚多巴胺组，组2为硅烷化组，组3为对照组。将各组纤维桩与树脂水门汀在根管内进行粘接，用精密切片机切出微推出实验试件，测定其微推出粘接强度并观察破坏模式。结果：组1（聚多巴胺组）微推出粘接强度为（7.909±1.987） MPa，组2（硅烷化组）为（5.906±0.620） MPa，组3（对照组）为（4.678±0.910） MPa，聚多巴胺组粘接强度值高于硅烷化组，差异有统计学意义（P<0.05）。结论：相较硅烷化处理，应用聚多巴胺处理玻璃纤维桩表面可以更有效地提高其与树脂水门汀在根管内的微推出粘接强度。

Objective： To evaluate the micro-push-out bond strengths of prefabricated glass fiber posts with poly-dopamine functionalized to root dentin using resin cements, contrasted with silane treatment. Methods: In the study, 30 glass fiber posts were randomly divided into 3 groups (10 posts in each group) for different surface treatments. Group 1, treated with poly-dopa; Group 2, treated with silane coupling agent for 60s; Group 3, no surface treatment (Control group). The 30 extracted human, single-rooted teeth were endodontically treated and a 9 mm post space was prepared in each tooth with post drills provided by the manufacturer. Following post cementation, the specimens were stored in distilled water at 37 ℃ for 7 days. The micro-push-out bond strengths were tested using a universal testing machine (0.5 mm/min), and the failure modes were examined with a stereomicroscope. The data of the three groups were statistically analyzed using the one-way ANOVA test(α= 0.05).Results: The bond strengths were (7.909±1.987) MPa for Group 1, (5.906 ±0.620) MPa for Group 2, and 4.678 ±0.910 MPa for Group 3. The bond strength of poly-dopamine group was significantly higher than that of the silane group (P<0.05). Conclusion: Contrasted with silane treatment, surface poly-dopamine functionalization was confirmed to be a more reliable method for improving the bond strength of resin luting agents to fiber posts.