期刊
JOURNAL OF DENTAL RESEARCH
卷 86, 期 8, 页码 739-744出版社
INT AMER ASSOC DENTAL RESEARCHI A D R/A A D R
DOI: 10.1177/154405910708600810
关键词
adhesion; one-step self-etch adhesive; droplets; HEMA; osmosis; phase separation; diffusion; origin of droplets; water
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.
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