title: Shear bond strengths of seven self-etching primers after thermo-cycling.
abstract: OBJECTIVE
  Self-etching primers are widely used in restorative dentistry. However, only one primer has been developed for orthodontic applications. The objective of this study was to assess the suitabiliy of restorative self-etching primers on unabraded enamel.
  
  
  METHODS
  Seven self-etching primers (Transbond™ SEP +, Xeno® III, Clearfil™ SE, Futurabond® NR, One Coat, M-Bond and OptiBond®) were compared with two conventionally-etched control groups (Transbond™ MIP). All groups with the exception of one of the two control groups underwent thermo-cycling (1000x, 5-55°C). Bovine teeth stored in physiological saline solution were used for the purpose of this study.
  
  
  RESULTS
  Both before and after thermo-cycling, the control groups presented very similar shear strengths which did not differ significantly from each other or from the Transbond™ SEP +  and Clearfil™ SE specimens. During thermo-cycling, all groups except the control group and the Transbond™ SEP  +  specimens displayed losses from the shear bodies. These losses occurred on all of the OptiBond® samples. The adhesive remnant index (ARI) and enamel tear-outs correlated closely with the adhesive values.
  
  
  CONCLUSIONS
  Our adhesive value assessments support the conclusion that only Transbond™ SEP +  and Clearfil™ SE can be recommended for clinical use.
authors.affiliation: Clinic for Orthodontics and Pediatric Dentistry, University of Basel, Switzerland. lorenz.brauchli@unibas.ch
authors.forename: L
authors.initials: L
authors.lastname: Brauchli
authors.forename: M
authors.initials: M
authors.lastname: Zeller
authors.forename: A
authors.initials: A
authors.lastname: Wichelhaus
mesh_terms: D000134:Acid Etching, Dental; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000473:pathology; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D049673:History, 20th Century; D008855:Microscopy, Electron, Scanning; D016910:Orthodontic Brackets; D019279:Resin Cements; D033081:Shear Strength; D013499:Surface Properties
chemical_list: C438313:Clearfil SE Bond; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate