Monomer-solvent phase separation in one-step self-etch adhesives
Monomer-solvent phase separation in one-step self-etch adhesives
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DOI：
10.1177/154405910508400214
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发表时间：
2005-02-01
影响因子：
7.6
通讯作者：
Van Meerbeek, B
中科院分区：
文献类型：
--
作者：
Van Landuyt, KL;De Munck, J;Van Meerbeek, B
一步粘合剂与牙釉质/牙本质的粘合效果不如多步粘合剂。为了研究这是否可能是由于粘合剂成分之间的相分离，我们采用透射电子显微镜表征了5种实验性和3种商业自酸蚀粘合剂与牙本质的相互作用。通过光学显微镜检查所有粘合剂的均匀性。使用微拉伸粘结强度协议确定与牙本质的粘结有效性。一步粘合剂的较低粘合强度与缓慢消失的多个液滴的光学显微镜观察相关。界面分析证实了粘合剂层内液滴的截留。在施加少量的HEMA（甲基丙烯酸2-羟乙酯）或含HEMA的粘合剂时液滴迅速消失，以及在所有含HEMA的粘合剂的界面处不存在液滴，强烈表明粘合剂单体在乙醇/丙酮蒸发时与水分离。在聚合时，液滴被截留在粘合剂内，潜在地危害粘合耐久性。这可以通过粘合剂的强力风干来避免，从而去除界面水，从而提高粘合效果。
One-step adhesives bond less effectively to enamel/dentin than do their multi-step versions. To investigate whether this might be due to phase separation between adhesive ingredients, we characterized the interaction of 5 experimental and 3 commercial self-etch adhesives with dentin using transmission electron microscopy. All adhesives were examined for homogeneity by light microscopy. Bonding effectiveness to dentin was determined with the use of a micro-tensile bond-strength protocol. The lower bond strength of the one-step adhesives was associated with light-microscopic observation of multiple droplets that disappeared slowly. Interfacial analysis confirmed the entrapment of droplets within the adhesive layer. The prompt disappearance of droplets upon application of a small amount of HEMA (2-hydroxyethyl methacrylate) or a HEMA-containing bonding agent, as well as the absence of droplets at the interface of all HEMA-containing adhesives, strongly suggests that the adhesive monomers separate from water upon evaporation of ethanol/acetone. Upon polymerization, the droplets become entrapped within the adhesive, potentially jeopardizing bond durability. This can be avoided by strong air-drying of the adhesive, thereby removing interfacial water and thus improving bonding effectiveness.