RESUMO
PURPOSE: 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).
Assuntos
Resinas Compostas , Colagem Dentária/métodos , Restauração Dentária Permanente/métodos , Adesivos Dentinários , Cimentos de Resina , Criança , Cárie Dentária/terapia , Falha de Restauração Dentária , Análise do Estresse Dentário , Dentina/patologia , Permeabilidade da Dentina , Humanos , Teste de Materiais , Saliva , Resistência à Tração , Fatores de Tempo , Dente DecíduoRESUMO
This study evaluated the bond strength and the interfacial morphology of composite restorations (SMP: Scotchbond Multi-Purpose - 3M; CSE: Clearfil SE Bond - Kuraray) in primary dentin. There is no statistical difference between groups. Fracture modes revealed a weak zone in the demineralized dentin (SMP) and in the hybrid layer (CSE). The interfacial morphology was similar in both groups. The demineralized zone in bond structures has a negative influence in adhesive restorations over the time.