title: Bonding properties of newly erupted and mature premolars.
abstract: BACKGROUND
  The purpose of this study was to determine whether there were differences in bond strength between mature and newly erupted teeth when using both conventional and self-etching primer techniques for bonding orthodontic appliances. The nature of adhesive bond failure among the groups was also compared by using the adhesive remnant index (ARI).
  
  
  METHODS
  Premolars were collected, randomly divided, and bonded with either the conventional or the self-etching technique. Brackets were debonded on a testing machine with a shear-testing device. Bond strengths were compared with ANOVA and the Weibull analysis.
  
  
  RESULTS
  There were no statistically significant differences in bond strength values between the conventional etching and the self-etching primer groups or between newly erupted and mature teeth. ARI scores differed between mature and newly erupted teeth. Newly erupted teeth had more adhesive failures, and mature teeth had more cohesive bond failures at the enamel-composite resin interface.
  
  
  CONCLUSIONS
  Based on these results, bond strength does not appear to be affected by the posteruptive enamel maturation process.
authors.affiliation: Department of Orthodontics, School of Dentistry, Virginia Commonwealth University, Richmond, VA 23298-0566, USA. etufekci@vcu.edu
authors.forename: Eser
authors.initials: E
authors.lastname: Tüfekçi
authors.forename: Diana M
authors.initials: DM
authors.lastname: Almy
authors.forename: J Malcolm
authors.initials: JM
authors.lastname: Carter
authors.forename: Peter C
authors.initials: PC
authors.lastname: Moon
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Lindauer
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000704:Analysis of Variance; D001641:Bicuspid / Q000254:growth & development / Q000502:physiology*; D001840:Dental Bonding; D017005:Dental Debonding; D003743:Dental Enamel / Q000737:chemistry* / Q000254:growth & development; D045662:Dental Etching / Q000379:methods; D003799:Dental Stress Analysis; D006801:Humans; D016910:Orthodontic Brackets; D033081:Shear Strength; D016019:Survival Analysis; D014078:Tooth Eruption