HEMA reactivity with demineralized dentin.
OBJECTIVE
2-Hydroxyethylmethacrylate (HEMA) was compared to its epoxy analogue, glycidoxypropylmethacrylate (GMA), for reactivity with 2,6-diaminohexanoic acid (Lysine), an amino acid present in collagen possessing a reactive amino side chain. The aim was to verify whether HEMA could chemically react with collagen fibers.


METHODS
Capillary electrophoresis was used to analyse reaction products together with computer aided chemistry. Retention of HEMA in demineralized dentine particles was investigated by infrared spectroscopy.


RESULTS
It was found by that HEMA does not form any new molecular species when contacted with lysine whereas GMA completely reacts to form the expected addition product. Computer aided chemistry confirmed this finding. Infrared spectroscopy showed that demineralized dentin has strong affinity for HEMA and retains this monomer despite extensive water washing.


CONCLUSIONS
We interpret this behavior as demonstrating solvation of HEMA in the collagen polymer network.
Sharrock
Patrick
P
Medical and Spatial Imaging Laboratory, University Toulouse III, Toulouse, France.
Grégoire
Geneviève
G
D000134:Acid Etching, Dental; D003094:Collagen / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin / Q000737:chemistry*; D019075:Electrophoresis, Capillary; D004852:Epoxy Compounds / Q000737:chemistry; D006801:Humans; D008239:Lysine / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D015394:Molecular Structure; D012995:Solubility; D013055:Spectrophotometry, Infrared; D013997:Time Factors
D003764:Dental Materials; D004852:Epoxy Compounds; D008689:Methacrylates; C005044:hydroxyethyl methacrylate; D003094:Collagen; D008239:Lysine; C007870:glycidyl methacrylate