title: Orthodontic bracket shear bond strengths produced by two high-power light-emitting diode modes and halogen light.
abstract: The aim of this in vitro study was to compare the shear bond strength of orthodontic brackets cured with two different high-power light-emitting diode (LED) polymerization modes with traditional halogen polymerization. A total of forty-five extracted human premolar teeth were randomly divided into three groups. Each group consisted of 15 teeth mounted in an acrylic block. Following a standard enamel etching protocol, orthodontic brackets were cured on the first group of teeth with fast-mode LED, the second group with soft-start mode LED, and on the last group with a halogen light. After bonding, the shear bond strengths of the brackets were tested with a universal testing machine. The results showed that brackets cured with soft-start mode LED produced the highest shear bond strengths (23.86 +/- 6.20 MPa). No significant difference was found between fast-mode LED (17.14 +/- 5.75 MPa) and the halogen group (17.38 +/- 5.41 MPa) (P > .05). The LED is effective for bonding metal brackets to teeth, and the soft-start mode gives higher bond strengths than the fast mode.
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, University of Suleyman Demirel, Cunur, Isparta, Turkey. kahraman@med.sdu.edu.tr
authors.forename: Hakan
authors.initials: H
authors.lastname: Türkkahraman
authors.forename: H Cenker
authors.initials: HC
authors.lastname: Küçükeşmen
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D003188:Composite Resins / Q000528:radiation effects; D003722:Dental Alloys; D001840:Dental Bonding; D003748:Dental Equipment; D003799:Dental Stress Analysis; D006219:Halogens; D006801:Humans; D008027:Light; D008422:Materials Testing; D016910:Orthodontic Brackets; D044367:Phase Transition; D011897:Random Allocation; D019279:Resin Cements / Q000528:radiation effects*; D012666:Semiconductors; D033081:Shear Strength; D013193:Stainless Steel; D018709:Statistics, Nonparametric
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D006219:Halogens; C429652:Reliance Light Bond; D019279:Resin Cements; D013193:Stainless Steel