论文部分内容阅读
目的:比较桩表面2种黏结剂涂层方法对纤维桩—核树脂黏结性能的影响。方法:36根纤维桩随机分为3组,桩表面分别做3种处理。A组不处理,作为对照;B组于桩表面涂双固化黏结剂XP BondTM并光照固化;C组在桩表面涂XP BondTM,使其自固化。处理后的纤维桩与Definit Core树脂黏结制成棒状试件,分别于水存24h和1个月后进行微拉伸强度(microtensile bonding strength,μTBS)测试和扫描电镜观察。采用SPSS 13.0软件包对μTBS的测试结果进行方差分析。结果:水存24h后,C组的μTBS〔(17.03±6.01)MPa〕显著高于A组〔(9.64±4.59)MPa〕和B组〔(11.99±6.07)MPa〕,P<0.05;水存1个月后,3个实验组间的μTBS无显著差异(P>0.05)。B组和C组水存1个月后的μTBS分别为(8.17±4.25)MPa和(9.85±4.11)MPa,均比水存24h后的值显著降低(P<0.05),且在扫描电镜下观察到明显的界面裂缝。结论:黏结剂桩表面涂层对纤维桩—核树脂的即时黏结强度的作用因黏结剂的固化方式而异,2种桩表面涂层方法均会降低纤维桩—核树脂的黏结持久性。
OBJECTIVE: To compare the effects of two binder coating methods on the bonding behavior of fiber posts and core resins. Methods: 36 fiber piles were randomly divided into three groups, and the surface of the pile was treated with three kinds of treatments. Group A was not treated as control; Group B was coated with double bond XP BondTM and cured with light; Group C was coated with XP BondTM and self-cured. The treated fiber posts were bonded with Definit Core resin to make rod-shaped specimens. Microtensile bonding strength (μTBS) and scanning electron microscopy were performed respectively for 24 and 1 months. ANOVA was performed on the results of μTBS using SPSS 13.0 software package. Results: μTBS 〔(17.03 ± 6.01) MPa〕 in group C was significantly higher than that in group A [(9.64 ± 4.59) MPa〕 and group B [(11.99 ± 6.07) MPa〕, P <0.05; After 1 month, there was no significant difference between the three experimental groups (P> 0.05). The values of μTBS in groups B and C after 1 month of storage were (8.17 ± 4.25) MPa and (9.85 ± 4.11) MPa, respectively, which were significantly lower than those in water for 24 hours (P <0.05) Obvious interface cracks were observed. CONCLUSION: The effect of adhesive coating on the instant bond strength of fiber post-core resin varies with the curing method of the adhesive. Both kinds of post-coating methods can reduce the durability of the fiber post-core resin.