title: Shear bond strengths produced by composite and compomer light cured orthodontic adhesives.
abstract: OBJECTIVE
  To test the shear bond strengths obtained when orthodontic brackets were bonded ex vivo using a composite resin and a compomer orthodontic adhesive.
  
  
  METHODS
  Specimens were tested in a special jig made to fit an Instron testing machine. After debonding, the adhesive remaining on bracket bases and enamel surfaces was mapped.
  
  
  RESULTS
  Bond strengths ranged from 8 to 23 MPa with the composite resin producing higher strengths than the compomer for similar combinations of variables. Bond strength was increased by longer curing and a longer debond interval and was higher for brackets with mesh bases than undercut bases. More compomer remained on the enamel surface after debonding than did the composite resin.
  
  
  CONCLUSIONS
  The compomer produced bond strengths within the range considered to be clinically acceptable in other studies. If it was clinically successful as an orthodontic adhesive a compomer would confer the advantage that fluoride release would help to minimize the onset of early caries around bonded brackets.
authors.affiliation: School of Dentistry, University of Birmingham, UK.
authors.forename: W P
authors.initials: WP
authors.lastname: Rock
authors.forename: M S
authors.initials: MS
authors.lastname: Abdullah
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000269:Adhesives / Q000737:chemistry*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D020770:Compomers; D003188:Composite Resins / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry; D001840:Dental Bonding; D003731:Dental Caries / Q000517:prevention & control; D017005:Dental Debonding; D003743:Dental Enamel / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D005459:Fluorides / Q000008:administration & dosage / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D017640:Silicates / Q000737:chemistry*; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D000180:Acrylic Resins; D000269:Adhesives; D020770:Compomers; D003188:Composite Resins; D003722:Dental Alloys; C088486:Dyract; D008689:Methacrylates; D017640:Silicates; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate; D005459:Fluorides