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Avaliação in vitro da resistência adesiva à dentina com um adesivo universal “low-cost”
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Abstract(s)
Objetivos: Avaliar a resistência adesiva à dentina por microtração, comparando o sistema adesivo Maxima® Natural Elegance 7 Universal com o sistema 3MTM ScotchbondTM Universal Plus quando aplicados pela estratégia adesiva self-etch e caracterizar morfologicamente a camada híbrida com recurso à microscopia eletrónica de varrimento (MEV).
Materiais e Métodos: Foram aleatoriamente selecionados 20 molares definitivos hígidos que posteriormente se dividiram em dois grupos experimentais (n = 10): Grupo SU (controlo) - 3MTM ScotchbondTM Universal Plus e Grupo MNE - Maxima® Natural Elegance 7 Universal. Os dentes foram cortados de modo a expor a dentina, e simulou-se a smear layer, posto isto, foram aplicados ambos os sistemas adesivos, seguindo as instruções dos fabricantes. Seguiu-se o armazenamento dos dentes já restaurados em água destilada a 37 ºC, por um período de 24 h. Após este tempo, os dentes foram seccionados em palitos de 1 mm2 e foi realizado o teste de microtração numa máquina de testes universal (1 kN; 0,5 mm/min). Foram classificados e registados os tipos de falha com um estereomicroscópio. Aleatoriamente foi selecionado um palito de cada grupo
experimental para observação no MEV. Os dados foram analisados com testes paramétricos para duas amostras independentes, t-student.
Resultados: Não existiram diferenças significativas (p > 0,05) entre os grupos SU e MNE. Relativamente às imagens obtidas no MEV não se observaram diferenças dignas de registo entre as imagens dos dois grupos, sendo que em ambos se verificou uma camada híbrida difusa com a presença de escassos resin tags.
Conclusões: Os sistemas adesivos aplicados pela mesma estratégia adesiva apresentaram resultados de resistência adesiva à microtração semelhantes. As imagens obtidas no MEV apresentaram características semelhantes entre os dois grupos.
Objectives: To evaluate the microtensile bond strength to dentin, comparing the Maxima® Natural Elegance 7 Universal adhesive system with the 3MTM ScotchbondTM Universal Plus system when applied using the self-etch adhesive strategy and to morphologically characterize the hybrid layer using scanning electron microscopy (SEM). Materials and Methods: Twenty healthy permanent molars were randomly assigned to two experimental groups (n = 10): Group SU (control) - 3MTM ScotchbondTM Universal Plus, and Group MNE - Maxima® Natural Elegance 7 Universal. The teeth were sectioned to expose the dentin, and the smear layer was simulated. Following this, both adhesive systems were applied according to the manufacturers' instructions. The restored teeth were then stored in distilled water at 37 °C for a period of 24 h. After this time, the teeth were sectioned into 1 mm2 sticks and a microtraction test was performed using a universal testing machine (1 kN; 0.5 mm/min). The types of failure were classified and recorded using a stereomicroscope. One stick from each experimental group was randomly selected for SEM observation. The data were analyzed using parametric tests for two independent samples, t-student. Results: There were no significant differences (p > 0.05) between the SU and MNE groups. The SEM images revealed no significant changes between the two groups. In both, a diffuse hybrid layer with the presence of scarce resin tags was identified. Conclusions: The adhesive systems applied using the same adhesive strategy showed similar results in terms of microtraction bond strength. The SEM images showed similar characteristics between the two groups.
Objectives: To evaluate the microtensile bond strength to dentin, comparing the Maxima® Natural Elegance 7 Universal adhesive system with the 3MTM ScotchbondTM Universal Plus system when applied using the self-etch adhesive strategy and to morphologically characterize the hybrid layer using scanning electron microscopy (SEM). Materials and Methods: Twenty healthy permanent molars were randomly assigned to two experimental groups (n = 10): Group SU (control) - 3MTM ScotchbondTM Universal Plus, and Group MNE - Maxima® Natural Elegance 7 Universal. The teeth were sectioned to expose the dentin, and the smear layer was simulated. Following this, both adhesive systems were applied according to the manufacturers' instructions. The restored teeth were then stored in distilled water at 37 °C for a period of 24 h. After this time, the teeth were sectioned into 1 mm2 sticks and a microtraction test was performed using a universal testing machine (1 kN; 0.5 mm/min). The types of failure were classified and recorded using a stereomicroscope. One stick from each experimental group was randomly selected for SEM observation. The data were analyzed using parametric tests for two independent samples, t-student. Results: There were no significant differences (p > 0.05) between the SU and MNE groups. The SEM images revealed no significant changes between the two groups. In both, a diffuse hybrid layer with the presence of scarce resin tags was identified. Conclusions: The adhesive systems applied using the same adhesive strategy showed similar results in terms of microtraction bond strength. The SEM images showed similar characteristics between the two groups.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Adesão Adesivo universal Dentina Microtração