Bonfante Estevam A, Pegoraro Luiz F, de Góes Mario F, Carvalho Ricardo M
Department of Prosthodontics, Integrated Center for Research, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
Dent Mater. 2008 Apr;24(4):483-91. doi: 10.1016/j.dental.2007.04.010. Epub 2007 Aug 6.
To test the null hypothesis that continuity of resin cement/dentin interfaces is not affected by location along the root canal walls or water storage for 3 months when bonding fiber posts into root canals.
Fiber posts were luted to bovine incisors using four resinous luting systems: Multilink, Variolink II, Enforce Dual and Enforce PV. After cementation, roots were longitudinally sectioned and epoxy resin replicas were prepared for SEM analysis (baseline). The original halves were immersed in solvent, replicated and evaluated. After 3 months water storage and a second solvent immersion, a new set of replicas were made and analyzed. The ratio (%) between the length (mm) of available bonding interface and the actual extension of bonded cement/dentin interface was calculated.
Significant lower percent values of bond integrity were found for Multilink (8.25%) and Variolink II (10.08%) when compared to Enforce Dual (25.11%) and Enforce PV (27.0%) at baseline analysis. The same trend was observed after immersion in solvent, with no significant changes. However, bond integrity was significantly reduced after 3 months water storage and a second solvent immersion to values below 5% (Multilink=3.31%, Variolink=1.87%, Enforce Dual=1.20%, and Enforce PV=0.75%). The majority of gaps were depicted at the apical and middle thirds at baseline and after immersion in solvent. After 3 months, gaps were also detected at the cervical third.
Bond integrity at the cement/dentin interface was surprisingly low after cementation of fiber posts to root canals with all resin cements. That was not significantly altered after immersion in solvent, but was further compromised after 3 months water storage. Gaps were mainly seen at middle and apical thirds throughout the experiment and extended to the cervical third after water storage for 3 months. Bond integrity of fiber posts luted to root canals was affected both by location and water storage.
检验在将纤维桩粘结到根管内时，树脂水门汀/牙本质界面的连续性不受根管壁位置或3个月水储存影响这一零假设。
使用四种树脂粘结系统（Multilink、Variolink II、Enforce Dual和Enforce PV）将纤维桩粘结到牛切牙上。粘结后，将牙根纵向切片，并制备环氧树脂复制品用于扫描电镜分析（基线）。将原始的两半浸入溶剂中，复制并评估。在水储存3个月并第二次浸入溶剂后，制作并分析一组新的复制品。计算可用粘结界面长度（mm）与粘结水门汀/牙本质界面实际延伸长度之间的比例（%）。
在基线分析时，与Enforce Dual（25.11%）和Enforce PV（27.0%）相比，Multilink（8.25%）和Variolink II（10.08%）的粘结完整性百分比值显著较低。浸入溶剂后观察到相同趋势，无显著变化。然而，在水储存3个月并第二次浸入溶剂后，粘结完整性显著降低至5%以下（Multilink = 3.31%，Variolink = 1.87%，Enforce Dual = 1.20%，Enforce PV = 0.75%）。在基线和浸入溶剂后，大多数间隙出现在根尖和中三分之一处。3个月后，在颈三分之一处也检测到间隙。
用所有树脂水门汀将纤维桩粘结到根管后，水门汀/牙本质界面的粘结完整性出奇地低。浸入溶剂后无显著改变，但在水储存3个月后进一步受损。在整个实验过程中，间隙主要出现在中三分之一和根尖三分之一处，水储存3个月后延伸至颈三分之一处。粘结到根管内的纤维桩的粘结完整性受位置和水储存的影响。
