Development of MDP-based one-step self-etch adhesive--effect of additional 4-META on bonding performance.
We designed three experimental 10-methacryloyloxydecyl dihydrogen phosphate (MDP)-based one-step (EX) adhesives consisting of MDP, urethane dimethacrylate, and triethylene glycol dimethacrylate adhesives with different water contents (98.4, 196.8, and 294.4 mg/g), and 4-methacryloyloxyethyl trimellitic anhydride (4-META) or 2-hydroxyethyl methacrylate (HEMA)-containing onestep adhesive. The effect of the amount of MDP-calcium (MDP-Ca) salt produced through demineralization of enamel and dentin on the bonding performance was examined. The efficacy of 4-META and HEMA was then discussed. When the amount of water in EX adhesive was increased, the production amount of MDP-Ca salt of enamel increased, but not the dentin. The enamel bond strength slightly increased with increasing the production amount of MDP-Ca salt, in contrast to the dentin. However, addition of 4-META in the EX adhesive (water content=98.4 mg/g) increased both bond strengths, although the production amounts of MDP-Ca salt significantly decreased. The 4-META enhances both bond strengths more effectively than the HEMA.
Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba, Japan.
Hitoshi
H
Iwai
Kou
K
Fujita
Hirotoshi
H
Iwai
Takuji
T
Ikemi
Haruhiko
H
Goto
Masahiro
M
Aida
Norihiro
N
Nishiyama
D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D000818:Animals; D017610:Calcium Compounds / Q000032:analysis*; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000737:chemistry*; D003799:Dental Stress Analysis; D003804:Dentin / Q000737:chemistry*; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D017001:Tooth Demineralization / Q000139:chemically induced*
D017610:Calcium Compounds; D008689:Methacrylates; D019279:Resin Cements