title: Effect of preliminary irradiation on the bond strength between a veneering composite and alloy.
abstract: The shear bond strength of a veneering composite (Solidex) and silver-palladium-copper-gold alloy (Castwell M.C.12) was evaluated for different duration times and irradiance for preliminary photo-polymerization. A veneering composite was applied onto a cast disk. Preliminary photo irradiation was performed using different duration times or irradiance. After final polymerization, the bond strength and the spectral distribution of each curing unit were determined. Shear bond strength was significantly higher for 90 s (12.4 MPa), than that for 0 s (8.3 MPa). With regard to the effect of irradiance, that from Solidilite (11.4 MPa) was significantly higher than that from Sublite S at 3 cm (8.7 MPa). The irradiance of Hyper LII and Sublite S at 3 cm was higher than Sublite S at 15 cm or Solidilite unit. Long time irradiation and low intensity is effective for preliminary irradiation in order to enhance the bond strength.
authors.affiliation: Nihon University Graduate School of Dentistry, Chiyoda-ku, Tokyo 101-8310, Japan.
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: Mika
authors.initials: M
authors.lastname: Furuchi
authors.forename: Akiko
authors.initials: A
authors.lastname: Oshima
authors.forename: Naomi
authors.initials: N
authors.lastname: Tanoue
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Koizumi
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
mesh_terms: D003188:Composite Resins / Q000528:radiation effects; D055117:Curing Lights, Dental; D003722:Dental Alloys; D003799:Dental Stress Analysis; D003801:Dental Veneers; D006047:Gold Alloys; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D033081:Shear Strength
chemical_list: C120982:Ag-Pd-Cu-Au alloy; D003188:Composite Resins; D003722:Dental Alloys; D006047:Gold Alloys; C113676:Solidex