title: Bond strength and failure patterns of adhesive restorations in primary teeth aged in the oral environment.
abstract: OBJECTIVE
  To evaluate the bond strength and micromorphology of the fracture pattern of adhesive composite restorations in primary teeth after long-term clinical function.
  
  
  METHODS
  Subjects (8-10 years-old) with deep carious lesions in primary molars had their teeth restored with resin composite (Z250). The teeth were randomly divided into two groups, according to the adhesive system used: (1) Scotchbond Multi-Purpose (SMP); and (2) Clearfil SE Bond (CSE). After the clinical and radiographic follow-up period (15-17 months), the teeth were exfoliated and the adhesive restorations were subjected to microtensile bond test.
  
  
  RESULTS
  Student's t-test revealed a statistical difference (P= 0.001) between the two adhesive systems tested (SMP = 16.8 +/- 2.62 MPa; CSE = 27.3 +/- 2.28 MPa). The micromorphology evaluation of the failure zone revealed a weak area in the demineralized dentin (SMP) and at the top of the hybrid layer (CSE).
authors.affiliation: Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Brazil. lucianocasagrande@hotmail.com
authors.forename: Luciano
authors.initials: L
authors.lastname: Casagrande
authors.forename: Vinícius
authors.initials: V
authors.lastname: de Hipólito
authors.forename: Mário Fernando
authors.initials: MF
authors.lastname: de Góes
authors.forename: Juliana Sarmento
authors.initials: JS
authors.lastname: Barata
authors.forename: Franklin
authors.initials: F
authors.lastname: Garcia-Godoy
authors.forename: Fernando Borba
authors.initials: FB
authors.lastname: de Araújo
mesh_terms: D002648:Child; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003731:Dental Caries / Q000628:therapy; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin / Q000473:pathology; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements; D012463:Saliva; D013718:Tensile Strength; D013997:Time Factors; D014094:Tooth, Deciduous
chemical_list: C438313:Clearfil SE Bond; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose