title: Effect of fluoride-releasing light-cured resin on shear bond strength of orthodontic brackets.
abstract: BACKGROUND
  The aim of this study was to analyze the effect of an enamel-protective resin on the shear bond strength (SBS) of orthodontic brackets bonded with self-etching primer.
  
  
  METHODS
  Eighty extracted premolars were randomly divided into 4 groups of 20, and metal brackets were bonded. Group 1 specimens were bonded with Transbond Plus self-etching primer (3M Unitek, Monrovia, Calif) and no fluoride resin; in group 2, a fluoride-releasing resin (Ortho-Coat, Pulpdent, Watertown, Mass) was used with the Transbond Plus self-etching primer; group 3 teeth were bonded with a new antimicrobial self-etching primer (Clearfil Protect Bond, Kuraray Medical, Osaka, Japan) with no fluoride resin; and the same protocol was used in group 4 with an application of Ortho-Coat. A universal testing machine was used to determine the SBS, and the adhesive remaining after debonding was assessed.
  
  
  RESULTS
  There was no difference in SBS whether fluoride-releasing resin was used. Groups 3 and 4 had higher SBS values than the other groups (P <0.001). The Kruskal-Wallis test showed no significant differences in the adhesive remnant index (chi-square = 0.019, P = 0.990).
  
  
  CONCLUSIONS
  The application of enamel-protective resin did not affect the bond strength of orthodontic brackets to enamel with self-etching primer systems.
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
authors.forename: Cumhur
authors.initials: C
authors.lastname: Tuncer
authors.forename: Burcu Baloş
authors.initials: BB
authors.lastname: Tuncer
authors.forename: Cağri
authors.initials: C
authors.lastname: Ulusoy
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry*; D002327:Cariostatic Agents / Q000737:chemistry*; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry*; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry; D055116:Self-Curing of Dental Resins; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D002327:Cariostatic Agents; C503075:Clearfil Protect Bond; D017220:Dentin-Bonding Agents; C534686:Ortho-Coat; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; D014867:Water; D005459:Fluorides