title: Effect of acid etching time on the degradation of resin-dentin bonds in primary teeth.
abstract: OBJECTIVE
  To investigate the influence of etching time on the degradation of resin-dentin bonds produced in primary teeth.
  
  
  METHODS
  40 primary molars were randomly divided into four groups according to the adhesive system, Single Bond (SB) and Clearfil SE Bond (CSEB), and acid etching time. SB was applied to dentin after phosphoric acid etching for 15 or 7 seconds, whereas CSEB was applied after the application of SE Primer for 20 or 10 seconds. Resin composite crowns were built-up followed by the production of specimens with a cross-sectional area of 0.49 mm2, which were further divided according to the storage condition, 24 hours, 6 and 12 months in water. Data were submitted to ANOVA and Tukey tests (alpha=0.05).
  
  
  RESULTS
  After 24 hours there was no significant difference between bond strengths produced by the adhesive systems, irrespective of the acid etching time. Water storage for 6 and 12 months significantly reduced bond strengths of SB, especially when the dentin was acid etched for 15 seconds. For CSEB, no significant alteration in bond strength was seen up to the storage period of 12 months for both etching times.
authors.affiliation: São Paulo State University-UNESP, Araraquara School of Dentistry, Department of Orthodontics and Pediatric Dentistry, Rua Humaitá, 1680 Araraquara, São Paulo 14801-903, Brazil.
authors.forename: Mariane Emi
authors.initials: ME
authors.lastname: Sanabe
authors.forename: Kamila Rosamiglia
authors.initials: KR
authors.lastname: Kantovitz
authors.forename: Carlos Alberto De Souza
authors.initials: CA
authors.lastname: Costa
authors.forename: Josimeri
authors.initials: J
authors.lastname: Hebling
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D017438:Bisphenol A-Glycidyl Methacrylate; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008963:Molar; D010756:Phosphoric Acids; D019279:Resin Cements; D013997:Time Factors; D014094:Tooth, Deciduous
chemical_list: C438313:Clearfil SE Bond; D017220:Dentin-Bonding Agents; D010756:Phosphoric Acids; D019279:Resin Cements; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; C030242:phosphoric acid