改良式微推出试验评价化学处理玻璃纤维桩表面后与树脂水门汀的粘接强度

目的:建立一种改良式微推出方式测试玻璃纤维桩表面经35%磷酸+硅烷偶联剂处理后与树脂水门汀的粘接强度,探讨此种测试模式评价玻璃纤维桩与树脂水门汀粘接强度的价值。方法:先将40支玻璃纤维桩随机分成2大组,每组20支,组1为磷酸+硅烷化组,组2为对照组。再将每一大组随机分为M(改良)和T(传统)两个小组,每组10支,分别用改良式微推出试验和传统微推出试验测定纤维桩与树脂水门汀的粘接强度并观察破坏模式。结果:组1M(磷酸+硅烷化组-改良)微推出粘接强度为(18.85±1.42) MPa,组1T(磷酸+硅烷化组-传统)为(19.39±1.35) MPa,组2M(对照组-改良)为(11.26±1.57)MPa,组2T(对照组-传统)为(11.27±1.83)MPa,在改良组和传统组中,磷酸+硅烷化组粘接强度值均显著高于对照组(P<0.01),且改良组中断裂模式100%为桩/树脂界面破坏,相比传统组的65.7%,更加集中体现界面粘接强度的变化。结论:相较于传统组,改良组微推出试验能更有效地评价纤维桩与树脂水门汀之间的粘接强度,且35%磷酸+硅烷化处理玻璃纤维桩表面可以更有效地提高其与树脂水门汀的粘接强度。

Evaluation of modified micro-push-out bond strength of glass fiber posts with chemically treated resin cements

Objective: To evaluate the modified micro-push-out bond strengths of prefabricated glass fiber posts with silaneafter 35% phosphoric acid to resin cements. Methods: In the study, 40 glass fiber posts were randomly divided into 2 groups (20 posts in each group) for different surface treatments. Group 1, treated with silaneafter 35% phosphoric acid;group 2, no surface treatment (Control group). Then each group was randomly divided into 2 minor groups (modified group and traditional group), with each group with 10. So the four groups were group 1M (phosphoric acid + silane-modified), group 1T (phosphoric acid + silane-traditional), group 2M (control-modified), and group 2T (control-traditional). A modified micro-push-out bond strength test method was used in modified groups. In traditional groups, the 20 extracted human, single-rooted teeth were endodontically treated. Gutta-percha was removed with #1-2 Peeso Reamers (Mani), and the post space of each specimen was enlarged with a standard drill system from the corresponding fiber post system to create a 9 mm post space with at least 4 mm of filling material in the root apex. Following post cementation according to the manufacturer’s instructions, the traditional micro-push-out bond strengths were tested using a universal testing machine(0.5 mm/min). Both failure modes were examined with a stereomicroscope. The data of the four groups were statistically analyzed using the one-way ANOVA test(α= 0.05). Results: The bond strengths were (18.85±1.42) MPa for group 1M, (19.39±1.35) MPa for group 1T, (11.26±1.57) MPa for group 2M, and (11.27±1.83) MPa for group 2T. The bond strength of Group 1 was significantly higher than that of group 2(P<0.05), no matter which method was used. The fracture mode 100% in group M was the destruction of the post/resin interface, compared with 65.7% in group T. Conclusion: In contrasted to the traditional micro-push-out test, the modified test can evaluate the bond strength of fiber post to resin cement more effectively, and 35% phosphate acid + silane treatment can improve the bonding strength.