纤维桩表面经黏结剂涂层后对桩—核树脂黏结性能的影响

Effect of post-coating with dental adhesives on the bonding properties between fiber-posts and core resin

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。

PURPOSE： To evaluate the effect of two post-coating methods with dental adhesives on the bonding properties between fiber posts and core resin.METHODS： Thirty-six fiber posts were randomly divided into 3 groups and treated as following： Group A,no treatment as control;Group B,coated with dual-cured XP bond and light curing;Group C,coated with XP bond and self-curing.All treated posts were cemented to Definit Core resin and made to stick-shape bonding specimens.All the specimens were subjected to microtensile bonding strength（μTBS） tests and scanning electronic microscopy（SEM） observation after storage in water for 24h and 1 month,respectively.The results of μTBS tests were analyzed by SPSS13.0 software package.RESULTS： After 24h water storage,μTBS of Group C（17.03MPa±6.01MPa）was significantly higher than that of Group A（9.64MPa±4.59MPa）and Group B（11.99MPa±6.07MPa）.After 1 month water storage,there was no significant difference among the three groups.The μTBS of Group B（8.17MPa±4.25MPa） and C（9.85 MPa±4.11MPa）both decreased after 1 month water storage.Interfacial gaps were also detected in groups B and C after 1 month water storage under SEM.CONCLUSIONS： Effect of post-coating with adhesives on the immediate bonding strength between fiber posts and core resin depends on the curing mode of adhesives.Both two post-coating methods would decrease the bonding durability of fiber posts and core resin.