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.
Nihon University Graduate School of Dentistry at Matsudo, Chiba, Japan.
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H
Iwai
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Nishiyama
D000134:Acid Etching, Dental / Q000379:methods; D000818:Animals; D002130:Calcium Phosphates / Q000032:analysis; D002417:Cattle; D001840:Dental Bonding; D003743:Dental Enamel / Q000737:chemistry; D003799:Dental Stress Analysis; D003804:Dentin / Q000737:chemistry; D017220:Dentin-Bonding Agents / Q000138:chemical synthesis / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008689:Methacrylates / Q000737:chemistry*; D019279:Resin Cements / Q000138:chemical synthesis / Q000737:chemistry*; D033081:Shear Strength; D013499:Surface Properties; D017001:Tooth Demineralization
D002130:Calcium Phosphates; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; C069749:methacryloyloxydecyl dihydrogen phosphate; C020243:calcium phosphate; C485829:calcium phosphate, dibasic, anhydrous