title: Influence of light intensity on dentin bond strength of self-etch systems.
abstract: The purpose of this study was to investigate the influence of light intensity on dentin bond strengths of four self-etch adhesive systems. The light intensities used to polymerize specimens were controlled at levels of 150, 300, 600, and 900 mW/cm2. The two-step self-etch adhesive systems Imperva Fluoro Bond and Mac Bond II, and the one-step self-etch systems Fluoro Bond Shake-One and One-Up Bond F Plus were used with their corresponding light-cured resins. Labial surfaces of lower bovine incisors were ground with #600 grit SiC paper to expose the dentin. The dentin surfaces were treated according to each manufacturer's instructions and bonded with resin composites. A shear bond strength test was performed and the data were analyzed by one-way ANOVA followed by Newman-Keuls multiple comparison at a level of 0.05. Statistical analysis of the data indicated that light intensity affected the dentin bond strengths of the adhesive systems tested. Significantly lower bond strengths were obtained by exposure to 150 mW/cm2, and there were no differences between the bond strengths obtained at 600 and 900 mW/cm2 for all the adhesive systems used. Further research will be required to clarify the irradiance-dependent properties of light-cured resin adhesive systems.
authors.affiliation: Nihon University Graduate School of Dentistry, Tokyo, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Yamamoto
authors.forename: Keishi
authors.initials: K
authors.lastname: Tsubota
authors.forename: Toshiki
authors.initials: T
authors.lastname: Takamizawa
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Kurokawa
authors.forename: Akitomo
authors.initials: A
authors.lastname: Rikuta
authors.forename: Susumu
authors.initials: S
authors.lastname: Ando
authors.forename: Tomoyoshi
authors.initials: T
authors.lastname: Takigawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Kuroda
authors.forename: Masashi
authors.initials: M
authors.lastname: Miyazaki
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000528:radiation effects*; D006244:Hardness; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000528:radiation effects; D044367:Phase Transition; D019279:Resin Cements / Q000528:radiation effects*; D033081:Shear Strength; D018709:Statistics, Nonparametric
chemical_list: D017220:Dentin-Bonding Agents; C503681:FL-BOND S-1; C452442:Mac Bond II; D008689:Methacrylates; C446260:One-Up-Bond F; D019279:Resin Cements; C474103:imperva fluoro bond