Effect of different adhesive systems and laser treatment on the shear bond strength of bleached enamel

J Dent. 2009 Jul;37(7):527-34. doi: 10.1016/j.jdent.2009.03.012. Epub 2009 Apr 28.


Purpose: This study determined the shear bond strength of a nanohybrid composite resin to bleached enamel immediately or 15 days later using different adhesive systems and laser application.

Methods: One hundred and forty enamel specimens were prepared from human molar teeth and bleached either with 16% carbamide peroxide (CP) or 30% CP according to the manufacturer's (Vivastyle/Vivadent) recommendations. After bleaching treatments specimens were divided into two groups according to the treatment time of the adhesive procedures: immediately or 15 days after the bleaching treatments. The four groups were then divided into five subgroups due to the surface treatments: using a two-step self-etching adhesive (AdheSe, Ivoclar Vivadent G, Schaan, Liechtenstein) or a two-step etch and rinse adhesive (Excite, Ivoclar Vivadent G, Schaan, Liechtenstein) and application of laser prior to adhesive procedures or not. After adhesive procedures nanohybrid composite resin cylinders of 4 mm x 2 mm (Tetric Evo Ceram/Vivadent) were bonded to the enamel surfaces. All specimens were subjected to shear bond strength test after thermocycling and 24h of storage in water. Data were analyzed statistically.

Results: Mann-Whitney U-test analysis showed no significant difference in the mean bond strength values of enamel bleached with either 16% CP or 30% CP (p>0.05). There was no difference between the groups bonded immediately or 15 days after bleaching (p>0.05). Application of the etch and rinse adhesive after 15 days showed the highest bond strength values, whereas self-etching adhesive and laser application showed the lowest values in both bleaching treatments.

Conclusions: The results suggested that following the bleaching treatments, the use of etch and rinse adhesive system may provide higher bond strengths than self-etching adhesive and laser application.

MeSH terms

  • Acid Etching, Dental
  • Acrylic Resins / chemistry
  • Carbamide Peroxide
  • Composite Resins / chemistry
  • Dental Bonding*
  • Dental Enamel / drug effects
  • Dental Enamel / radiation effects
  • Dental Enamel / ultrastructure*
  • Dental Materials / chemistry
  • Drug Combinations
  • Humans
  • Lasers, Solid-State*
  • Materials Testing
  • Methacrylates / chemistry
  • Microscopy, Electron, Scanning
  • Nanocomposites / chemistry
  • Oxidants / administration & dosage
  • Oxidants / therapeutic use*
  • Peroxides / administration & dosage
  • Peroxides / therapeutic use
  • Resin Cements / chemistry*
  • Shear Strength
  • Stress, Mechanical
  • Temperature
  • Time Factors
  • Tooth Bleaching / methods*
  • Urea / administration & dosage
  • Urea / analogs & derivatives
  • Urea / therapeutic use
  • Water / chemistry


  • Acrylic Resins
  • AdheSE cement
  • Composite Resins
  • Dental Materials
  • Drug Combinations
  • Excite cement
  • Methacrylates
  • Oxidants
  • Peroxides
  • Resin Cements
  • Tetric EvoCeram
  • Water
  • Carbamide Peroxide
  • Urea