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Resistência adesiva à dentina por microtração de um sistema adesivo de baixo custo após envelhecimento
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Orientador(es)
Resumo(s)
Objetivos: Avaliar a resistência adesiva à dentina, através do teste de microtração, utilizando um adesivo self-etch de baixo custo (OliEtch Bond, Olident) em comparação com um adesivo universal (ScotchbondTM Universal® Plus) após envelhecimento térmico.
Materiais e Métodos: Vinte molares definitivos hígidos humanos, previamente preparados, foram distribuídos aleatoriamente em dois grupos experimentais (n =10): Grupo SBU (controlo) - ScotchbondTM Universal® Plus e Grupo OEB (experimental) – OliEtch Bond. Inicialmente foram realizados cortes para expor a dentina superficial e, de seguida, simulou-se a smear layer para posterior aplicação do sistema adesivo e da resina composta, de acordo com o protocolo de cada grupo experimental. Os dentes previamente restaurados foram submetidos a 10 000 ciclos de termociclagem e seccionados em palitos de 1 mm2, sendo submetidos ao ensaio de microtração numa máquina de testes universal (1 kN; 0,5 mm/min). Foram observadas as superfícies de fratura num estereomicroscópio e registado o tipo de falha. Os dados foram analisados estatisticamente com os testes Mann-Whitney (α = 0,05). Um palito por grupo foi selecionado aleatoriamente para observação no MEV.
Resultados: Verificaram-se diferenças estatisticamente significativas (p = 0,023) entre os dois grupos, com o Scotchbond™ Universal Plus a apresentar valores de μTBS superiores e mais consistentes quando comparado com o OliEtch Bond. A maioria das falhas registadas em ambos os grupos foi de natureza adesiva. As imagens obtidas por MEV demonstraram uma camada híbrida contínua e homogénea em ambos os grupos experimentais, sem diferenças morfológicas marcantes.
Conclusões: A resistência adesiva à dentina foi significativamente superior com o Scotchbond™ Universal Plus em comparação com o OliEtch Bond após envelhecimento térmico.
Objectives: Evaluate the adhesive strength to dentin, through the microtensile bond strength (μTBS) test, using a low-cost self-etch adhesive (OliEtch Bond, Olident) compared with a universal adhesive (Scotchbond™ Universal® Plus) after thermal aging. Materials and methods: Twenty sound human permanent molars, previously prepared, were randomly assigned to two experimental groups (n = 10): SBU group (control) – Scotchbond™ Universal® Plus and OEB group (experimental) – OliEtch Bond. Superficial dentin was exposed and a smear layer was simulated prior to the application of the adhesive system and composite resin, according to the protocol of each group. Restored teeth were subjected to 10,000 thermocycling cycles and sectioned into sticks with a cross-sectional area of 1 mm², which were tested in microtensile bond strength using a universal testing machine (1 kN; 0.5 mm/min). Fracture surfaces were examined under a stereomicroscope and the failure mode was recorded. Data were statistically analyzed using the Mann-Whitney test (α = 0.05). One stick per group was randomly selected for observation under SEM. Results: Statistically significant differences (p = 0,023) were observed between the two groups, with Scotchbond™ Universal Plus showing higher and more consistent μTBS values compared to OliEtch Bond. Most failures in both groups were adhesive in nature. SEM images revealed a continuous and homogeneous hybrid layer in both experimental groups, without marked morphological differences. Conclusions: Adhesive strength to dentin was significantly higher with Scotchbond™ Universal Plus compared to OliEtch Bond after thermal aging.
Objectives: Evaluate the adhesive strength to dentin, through the microtensile bond strength (μTBS) test, using a low-cost self-etch adhesive (OliEtch Bond, Olident) compared with a universal adhesive (Scotchbond™ Universal® Plus) after thermal aging. Materials and methods: Twenty sound human permanent molars, previously prepared, were randomly assigned to two experimental groups (n = 10): SBU group (control) – Scotchbond™ Universal® Plus and OEB group (experimental) – OliEtch Bond. Superficial dentin was exposed and a smear layer was simulated prior to the application of the adhesive system and composite resin, according to the protocol of each group. Restored teeth were subjected to 10,000 thermocycling cycles and sectioned into sticks with a cross-sectional area of 1 mm², which were tested in microtensile bond strength using a universal testing machine (1 kN; 0.5 mm/min). Fracture surfaces were examined under a stereomicroscope and the failure mode was recorded. Data were statistically analyzed using the Mann-Whitney test (α = 0.05). One stick per group was randomly selected for observation under SEM. Results: Statistically significant differences (p = 0,023) were observed between the two groups, with Scotchbond™ Universal Plus showing higher and more consistent μTBS values compared to OliEtch Bond. Most failures in both groups were adhesive in nature. SEM images revealed a continuous and homogeneous hybrid layer in both experimental groups, without marked morphological differences. Conclusions: Adhesive strength to dentin was significantly higher with Scotchbond™ Universal Plus compared to OliEtch Bond after thermal aging.
Descrição
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Palavras-chave
Adesão Resistência adesiva Adesivo universal Microtração