Effect of calcium salt of functional monomer on bonding performance

To determine the amount of 10-methacryloyloxydecyl dihydrogen phosphate (mdp)-calcium (mdp-ca) salt produced through the demineralization of enamel or dentin by mdp,we designed experimental mdp-based one-step adhesives with different amounts of mdp. the null hypotheses were that (1) the amount of mdp-ca salt produced through the demineralization of enamel was the same as that for dentin,and (2) the amounts of mdp-ca salt have no effect on bonding performance. increases in the amount of mdp resulted in increased amounts of mdp-ca salt. the production amount of mdp-ca salt of the dentin was 1.3 times higher than that of the enamel. the predominant species of the mdp and enamel reactants was a calcium hydrogen phosphate of mdp. in contrast,the dentin yielded both calcium phosphate and calcium hydrogen phosphate of mdp. increases in the amount of mdp-ca salt decreased both enamel and dentin bond strengths. an optimal concentration of mdp exists in one-step self-etch adhesives. © 2012 international & american associations for dental research.