Title: Assessment by nano-indentation of the hardness and elasticity of the resin-dentin bonding area
Authors: Van Meerbeek, Bart ×
Willems, Guy
Celis, Jean-Pierre
Roos, Jozef
Braem, M.
Lambrechts, Paul
Vanherle, Guido #
Issue Date: Oct-1993
Series Title: Journal of Dental Research vol:72 issue:10 pages:1434-1442
Abstract: The hardness and Young's modulus of the successive layers across a resin-dentin bonding area were determined by nano-indentation for four commercially-available dentin adhesive systems, of which two were also applied with a different conditioning agent. With a computer-controlled nano-indentation technique, minute triangular indentations were made within a small area of a few micrometers' diameter at a load of a few milli-Newtons. The load and displacement of the indenter were continuously monitored during the loading-unloading sequence, so hardness and Young's modulus could be computed as a function of the indenter geometry and the applied load. The hardness of the resin-dentin interdiffusion zone was significantly lower than that of unaltered dentin. A gradient of moduli of elasticity was observed from the rather stiff dentin over a more elastic resin-dentin interdiffusion zone and adhesive resin layer to the restorative composite. That gradient was more substantial in those systems that produced relatively thick adhesive resin layers or supplementally provided a filled low-viscosity resin as an intermediate layer between the adhesive resin and the bulk restorative composite. Such an elastic bonding area might have a strain capacity sufficient to relieve stresses between the shrinking composite restoration and the rigid dentin substrate, thereby improving the conservation of the dentin bond and, as a consequence, the marginal integrity and retention of the restoration.
ISSN: 0022-0345
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biomaterials - BIOMAT
Chemical and Extractive Metallurgy Section (-)
× corresponding author
# (joint) last author

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