title: Bracket bond strength comparison between new unfilled experimental self-etching primer adhesive and conventional filled adhesives.
abstract: OBJECTIVE
  To determine if a new unfilled experimental self-etching primer (SEP) adhesive system (SBP-40TX + C&B Metabond) that incorporates a methyl methacrylate-based 4-META/TBB (4-methacryloxyethyl trimellitate anhydride tri-n-butyl borane) resin can provide adequate shear bond strength (SBS) when used for bonding orthodontic brackets.
  
  
  METHODS
  Forty-eight human maxillary premolars were randomly divided into three groups of 16 specimens each. Brackets were bonded with three bonding systems. A filled Bis-GMA/TEGDM (triethylene glycol dimethacrylate)-based SEP adhesive system (Transbond Plus) and an unfilled conventional etch-and-rinse adhesive system (C&B Metabond) were used for comparison. The SBS for each sample was examined with a universal testing machine, and the Adhesive Remnant Index score was calculated. Enamel surfaces after conditioning were examined using a scanning electron microscope. Data were compared by one-way analysis of variance and a chi(2) test.
  
  
  RESULTS
  The experimental SEP showed a milder etching pattern than Transbond Plus SEP. No statistically significant differences in the mean SBS were found between the specimens bonded with the unfilled experimental SEP adhesive system (10.0 MPa) and the filled SEP adhesive system (8.7 MPa). The unfilled experimental SEP adhesive system showed less residual adhesive than the filled SEP adhesive system.
  
  
  CONCLUSIONS
  The unfilled experimental SEP adhesive system showed a clinically sufficient SBS that was equivalent to the filled SEP adhesive system.
authors.affiliation: Department of Oral Growth and Development, Health Sciences University of Hokkaido, Hokkaido, Japan. iijima@hoku-iryo-u.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Iijima
authors.forename: Shuichi
authors.initials: S
authors.lastname: Ito
authors.forename: Takeshi
authors.initials: T
authors.lastname: Muguruma
authors.forename: Takashi
authors.initials: T
authors.lastname: Saito
authors.forename: Itaru
authors.initials: I
authors.lastname: Mizoguchi
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D001896:Boron Compounds / Q000737:chemistry; D016009:Chi-Square Distribution; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000648:ultrastructure; D045662:Dental Etching / Q000379:methods; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D018709:Statistics, Nonparametric
chemical_list: D001896:Boron Compounds; D008689:Methacrylates; D008768:Methylmethacrylates; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C049495:Super-bond