Bond strength and failure patterns of adhesive restorations in primary teeth aged in the oral environment.
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).
Casagrande
Luciano
L
Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Brazil. lucianocasagrande@hotmail.com
de Hipólito
Vinícius
V
de Góes
Mário Fernando
MF
Barata
Juliana Sarmento
JS
Garcia-Godoy
Franklin
F
de Araújo
Fernando Borba
FB
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
C438313:Clearfil SE Bond; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose