Journal of Dental Research, Vol 69, 46-50, Copyright © 1990 by International & American Associations for Dental Research Online Journals
A scanning electron microscopic investigation of bonding of methacryloyloxyalkyl hydrogen maleate to etched dentin
T. Fukushima and T. Horibe
Department of Dental Materials and Devices, Fukuoka Dental College, Japan.
Three types of methacryloyloxyalkyl hydrogen
maleates--2-(methacryloyloxy)ethyl hydrogen maleate (2MEM),
1-(methacryloyloxy-methyl)ethyl hydrogen maleate (MMEM), and
1-(methacryloyloxymethyl)propyl hydrogen maleate (MMPM)--were prepared for
use as bonding agents. The relationships between the thickness of an
acid-proof dentin layer and the bond strength and chemical structure of the
synthesized monomers were investigated. The bond strengths of
2MEM/composite system to dentin treated with either 37% phosphoric acid
solution or 10% citric acid-3% ferric chloride solution (10-3 solution)
were superior to those of the others. The acid-proof dentin layer for all
bonding agents containing the synthesized monomers at the resin-dentin
interface was clearly visible in a scanning electron microscope, regardless
of the types of dentin etching agents used. After treatment of the dentin
with the phosphoric acid solution, the layers of 2MEM, MMEM, and MMPM were
5-6 micron, 3-4 micron, and 2-3 micron thick, respectively. When the dentin
was treated with the 10-3 solution, the layer for each bonding agent was
approximately 1 micron thick.
