title: Characterization of photopolymerization of dentin adhesives as a function of light source and irradiance.
abstract: Manufacturers have attempted to address the limitations associated with dentin bonding by eliminating as many steps as possible in the bonding protocol. Theoretically, this approach increases the efficiency of the procedure and reduces technique sensitivity. These trends are reflected in the introduction of all-in one, single-step adhesive systems; the increased concentration of acidic resin monomers in these systems allows for simultaneous etching and priming of the prepared dentin surface. Ideally, the degree of monomer conversion would be high enough that the acidic reaction would be self-limiting. The purpose of this study was to investigate the effect of light irradiance and source on the photopolymerization of three commercial dental adhesives by monitoring the double bond conversion as a function of time during and after irradiation. The photopolymerization curing efficiency of the commercial adhesives investigated in this study varied as a function of light source and distance. The use of LED performed better than the halogen light in terms of polymerization rate and degree of conversion for the commercial single-step, sixth generation adhesive, Adper Prompt. In contrast, polymerization of commercial single-bottle, fifth generation adhesive, Single Bond and One-Up Bond F, was mainly a function of exposure time, irrespective of the two light units or intensities.
authors.affiliation: Department of Oral Biology, University of Missouri-Kansas City School of Dentistry, Kansas City, Missouri 64108, USA.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Ye
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.forename: Karen
authors.initials: K
authors.lastname: Williams
authors.forename: Paulette
authors.initials: P
authors.lastname: Spencer
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry / Q000528:radiation effects; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000528:radiation effects*; D006801:Humans; D066298:In Vitro Techniques; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry / Q000528:radiation effects; D010755:Organophosphates / Q000737:chemistry / Q000528:radiation effects; D010777:Photochemistry; D011108:Polymers / Q000737:chemistry / Q000528:radiation effects; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors
chemical_list: C489661:Adper Prompt Self-Etch; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C446260:One-Up-Bond F; D010755:Organophosphates; D011108:Polymers; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate