Correlação entre grau de conversão e resistência de união de sistemas adesivos autocondicionantes

Detalhes bibliográficos
Ano de defesa: 2010
Autor(a) principal: Borges, Marciano de Freitas
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Santa Maria
BR
Odontologia
UFSM
Programa de Pós-Graduação em Ciências Odontológicas
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://repositorio.ufsm.br/handle/1/6064
Resumo: Objective: The aim of this study was to analyses the relationship between the degree of conversion of double bonds of self-etching adhesives and microshear bond strength on dentin. Materials and methods: For microshear testing twenty third molar caries free were selected. They had their crowns sectioned longitudinally so as to obtain slices that were randomly chosen and divided into four groups according to the adhesive system, Single Bond (SB), Clearfil SEBond (CL) , Adhese (AD) and Gbond (GB). The slices were included into epoxy resin, and then cylindrical restorations were built with an area of 1.0 mm in diameter and 2.0 mm in height, around ten restorations per group, using a starch matrix. After 24 hours the specimens were tested for bond strength. To analyze the degree of conversion of these systems, a drop of adhesive was dispensed on a glass plate and after 20 seconds polymerized, forming a film of adhesive. After 24 hours, these films were pulverized and mixed with potassium bromide, pressed in a hydraulic press to form an insert for analysis with the spectrophotometer - FT-IR. The data of shear bond strength and degree of conversion of each specimen were submitted to ANOVA and Tukey s test (p = 0.05). Results: The SB adhesive system had mean values of bond strength statistically higher than AD and GB, but no statistical difference was found with Cl. Among the self-etching systems, the highest average shear bond strength was achieved with the application of the union CL, followed by GB and AD systems, which were not statistically different. Regarding the degree of conversion, similar statistical results were found for the systems SB and CL, and despite the SB had a higher average it, did not differ from CL. The adhesive system SB and CL showed higher values in AD and GB. The AD, showed values higher than the GB. Conclusion: The degree of conversion is affected by several factors related to the complex mixture of adhesive systems, which somehow contribute to their bond strength.