Van Landuyt K L, Snauwaert J, De Munck J, Coutinho E, Poitevin A, Yoshida Y, Suzuki K, Lambrechts P, Van Meerbeek B
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, B-3000 Leuven, Belgium.
J Dent Res. 2007 Aug;86(8):739-44. doi: 10.1177/154405910708600810.
Contemporary one-step self-etch adhesives are often documented with interfacial droplets. The objective of this study was to research the origin of these droplets. Two HEMA-rich and one HEMA-free adhesive were applied to enamel and dentin, with the lining composite either immediately cured or cured only after 20 min. All one-step adhesives exhibited droplets at the interface; however, the droplets had two different origins. With the HEMA-free adhesives, droplets were located throughout the adhesive layer and were stable in number over time. With the HEMA-rich adhesives, the droplets were observed exclusively at the adhesive resin/composite interface, and their number increased significantly when the composite was delay-cured. Only the latter droplets caused a significant drop in bond strength after delayed curing. While the droplets in the HEMA-free one-step adhesives should be ascribed to phase separation, those observed with HEMA-rich adhesives resulted from water absorption from dentin through osmosis.
当代的一步自酸蚀粘结剂常常会出现界面液滴。本研究的目的是探究这些液滴的来源。将两种富含甲基丙烯酸羟乙酯（HEMA）的粘结剂和一种不含HEMA的粘结剂应用于牙釉质和牙本质，衬层复合树脂要么立即固化，要么仅在20分钟后固化。所有一步粘结剂在界面处均呈现液滴；然而，这些液滴有两种不同的来源。对于不含HEMA的粘结剂，液滴遍布粘结剂层，且数量随时间保持稳定。对于富含HEMA的粘结剂，液滴仅在粘结树脂/复合树脂界面处观察到，当复合树脂延迟固化时，其数量显著增加。仅后一种液滴在延迟固化后会导致粘结强度显著下降。不含HEMA的一步粘结剂中的液滴应归因于相分离，而富含HEMA的粘结剂中观察到的液滴是由于牙本质通过渗透作用吸水所致。
