title: Effect of reacted acidic monomer with calcium on bonding performance.
abstract: We determined the number of reacted and unreacted 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) molecules with calcium during the demineralization process of hydroxyapatite or dentin by 10-MDP-based one-step (Clearfil Tri-S Bond, TS) or two-step self-etch adhesive (Clearfil SE Bond Primer, SE). We then examined the effects of the number of reacted and/or unreacted 10-MDP molecules on the initial bond strength and bond durability of the resultant adhesive layer. The null hypotheses were that (1) the etching efficacy of tooth apatite by 10-MDP used in TS was the same as that in SE, and (2) the unreacted 10-MDP polymer included within the adhesive layer does not affect bond durability. Addition of hydroxyapatite or dentin to the TS and SE resulted in decreases in the NMR peak intensities for 10-MDP. The peak intensity for 10-MDP showed a greater reduction in SE than in TS, consistent with the observation that SE provided significantly higher initial mean bond strengths than TS. Further, the unreacted 10-MDP polymer within the adhesive layer did not decrease the mean bond strength, despite the application of 20,000x thermo-cycling.
authors.affiliation: Department of Dental Caries Control and Aesthetic Dentistry, Nihon University School of Dentistry at Matsudo, 870-1 Sakaecho, Nishi 2, Matsudo, Chiba 271-8587, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Fujita
authors.forename: S
authors.initials: S
authors.lastname: Ma
authors.forename: M
authors.initials: M
authors.lastname: Aida
authors.forename: T
authors.initials: T
authors.lastname: Maeda
authors.forename: T
authors.initials: T
authors.lastname: Ikemi
authors.forename: M
authors.initials: M
authors.lastname: Hirata
authors.forename: N
authors.initials: N
authors.lastname: Nishiyama
mesh_terms: D000818:Animals; D002118:Calcium / Q000737:chemistry; D002417:Cattle; D001840:Dental Bonding; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D017001:Tooth Demineralization
chemical_list: C438313:Clearfil SE Bond; C515604:Clearfil Tri-S Bond; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; C069749:methacryloyloxydecyl dihydrogen phosphate; D017886:Durapatite; D002118:Calcium