title: A comparative evaluation of bracket bonding with 1-, 2-, and 3-component adhesive systems.
abstract: BACKGROUND
  Today, 1- and 2-component adhesives are available for bracket bonding that could diminish the possibility of contamination during the bonding procedure and save the clinician chair-side time. Our aim in this study was to compare the shear bond strengths and the adhesive remnant index (ARI) scores of 1-, 2-, and 3-component adhesives after thermocycling.
  
  
  METHODS
  Fifty stainless steel brackets (10 per adhesive group) were bonded to extracted third molars with 5 adhesives. Group 1 was a 1-component adhesive, RelyX Unicem (3M Espe, Seefeld, Germany). Group 2 was a 1-component adhesive, Maxcem (Kerr, Orange, Calif). Group 3 was a self-conditioning 2-component adhesive system, Multilink (Ivoclar-Vivadent, Schaan, Liechtenstein). Group 4 was a 2-component adhesive system, Transbond Plus primer (self-etching) and Transbond XT adhesive (3M Unitek, Monrovia, Calif). Group 5 (control group) was a conventional 3-component adhesive system consisting of an etchant, Transbond XT primer, and XT adhesive (3M Unitek). All samples were thermocycled (6000 x 5 degrees C/55 degrees C) in a mastication device before shear bond strength testing and evaluation with the ARI.
  
  
  RESULTS
  No significant differences of shear bond strength between the 2- and 3-component adhesive systems were found. Significant decreases of shear bond strength were observed with 1-component adhesives, RelyX Unicem and Maxcem, compared with 2- and 3-component systems. The ARI scores indicated no significant differences between the groups.
  
  
  CONCLUSIONS
  With enhanced shear bond strength, 1- component adhesives have the potential to compete successfully with 2- or 3-component adhesives.
authors: Department of Orthodontics, University Medical Center of Regensburg, Regensburg, Germany. Andreas.Faltermeier@klinik.uni-regensburg.de
authors: Andreas
authors: A
authors: Faltermeier
authors: Michael
authors: M
authors: Behr
authors: Dieter
authors: D
authors: Müssig
mesh_terms: D045662:Dental Etching / Q000379:methods; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000145:classification; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing / Q000379:methods; D008964:Molar, Third; D016910:Orthodontic Brackets; D033081:Shear Strength; D018709:Statistics, Nonparametric
chemical_list: D017220:Dentin-Bonding Agents