Navarra Chiara O, Cadenaro Milena, Codan Barbara, Mazzoni Annalisa, Sergo Valter, De Stefano Dorigo Elettra, Breschi Lorenzo
Division of Dental Sciences and Biomaterials, Department of Biomedicine, University of Trieste, Trieste, Italy.
Eur J Oral Sci. 2009 Aug;117(4):463-9. doi: 10.1111/j.1600-0722.2009.00654.x.
Suboptimally polymerized monomers may be responsible for the reduced material properties of simplified adhesives and their inherent bonded interface instability. This study was performed to determine the degree of cure within the hybrid layers produced by three one-step self-etch adhesives in situ using Raman microspectroscopy and to investigate nanoleakage expression. Dentin disks were bonded with AdheSE One, Adper Prompt L-Pop, or iBond. Composite layers of 2-mm thickness were built up in bulk on the polymerized adhesive surfaces and then the adhesive-dentin interfaces were exposed to a micro-Raman beam. Adhesive penetration was calculated using the relative intensities of bands associated with mineral and adhesive, and the degree of conversion (DC) was evaluated. Interfacial nanoleakage expression was evaluated on the same specimens. The DC values for the tested adhesives were found to increase in the following order: AdheSE One (48 +/- 16%) < Adper Prompt L-Pop (83 +/- 2%) = iBond (90 +/- 6%; P < 0.05). AdheSE One showed greater nanoleakage expression than iBond or Adper Prompt L-Pop. Increased nanoleakage expression was associated with AdheSE One that showed the lowest DC. This suggests that a low DC may affect the quality and the long-term stability of the adhesive interface owing to the elution of unreacted monomers forming a porous and highly permeable hybrid layer.
聚合程度欠佳的单体可能是导致简化型粘结剂材料性能降低及其固有粘结界面不稳定的原因。本研究旨在使用拉曼光谱法原位测定三种一步法自酸蚀粘结剂产生的混合层内的固化程度，并研究纳米渗漏情况。用AdheSE One、Adper Prompt L-Pop或iBond粘结牙本质片。在聚合后的粘结剂表面整体构建2毫米厚的复合层，然后将粘结剂-牙本质界面暴露于显微拉曼光束下。利用与矿物质和粘结剂相关的谱带相对强度计算粘结剂的渗入情况，并评估转化率（DC）。在相同样本上评估界面纳米渗漏情况。发现测试粘结剂的DC值按以下顺序增加：AdheSE One（48±16%）＜Adper Prompt L-Pop（83±2%）=iBond（90±6%；P＜0.05）。AdheSE One显示出比iBond或Adper Prompt L-Pop更大的纳米渗漏。纳米渗漏增加与显示最低DC的AdheSE One有关。这表明低DC可能会因未反应单体的洗脱形成多孔且高渗透性的混合层而影响粘结界面的质量和长期稳定性。
