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Title: Monomer-solvent phase separation in one-step self-etch adhesives
Authors: Van Landuyt, Kirsten ×
De Munck, Jan
Snauwaert, Johan
Coutiño, Eduardo
Poitevin, André
Yoshida, Y
Inoue, S
Peumans, Marleen
Suzuki, K
Lambrechts, Paul
Van Meerbeek, Bart #
Issue Date: Jan-2005
Publisher: Int amer assoc dental researchi a d r/a a d r
Series Title: Journal of Dental Research vol:84 issue:2 pages:183-8
Abstract: 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.
ISSN: 0022-0345
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biomaterials - BIOMAT
Clinical Residents Dentistry
Chemistry - miscellaneous
× corresponding author
# (joint) last author

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