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Estudo in vitro da resistência adesiva à dentina utilizando um adesivo universal com a técnica selective dentin etching após envelhecimento térmico
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Abstract(s)
Objetivo: Avaliar in vitro a resistência adesiva à dentina por microtração quando o adesivo OptiBond™ Universal® é aplicado numa estratégia adesiva selective dentin etching após envelhecimento térmico e realizar uma análise ultramorfológica através de microscopia eletrónica de varrimento.
Materiais e métodos: Foram usados trinta dentes molares humanos definitivos hígidos extraídos. Após simulação da smear layer, os dentes foram aleatoriamente distribuídos por três grupos experimentais (n = 10): Grupo SE (controlo) – aplicação de OptiBond™ Universal® segundo self-etch; Grupo SDE1 – aplicação de OptiBond™ Universal® pela técnica selective dentin etching (aplicação de ácido ortofosfórico 37 % durante 3 s); Grupo SDE3 – aplicação de três camadas de OptiBond™ Universal® pela técnica selective dentin etching. Após aplicação da resina composta, os dentes foram submetidos a 10 000 ciclos de termociclagem (5-55 ºC) e posteriormente seccionados em palitos com secção transversal de 1 mm2 para serem submetidos a forças de tração numa máquina de testes universal (0,5 mm/min; 1 kN). A superfície de fratura de cada palito foi observada e a falha foi classificada. Os resultados foram analisados estatisticamente com ANOVA one-way (α= 0,05). Um palito por grupo foi selecionado aleatoriamente para ser observado por microscopia.
Resultados: Não foram encontradas diferenças estatisticamente significativas (p > 0,05) nos valores de resistência adesiva à microtração entre os três grupos experimentais. A maioria das falhas foi adesiva e as imagens de microscopia mostraram uma camada híbrida uniforme e íntegra em todos os grupos.
Conclusões: A aplicação de Optibond™ Universal® com uma estratégia adesiva selective dentin etching não afetou negativamente a adesão à dentina após termociclagem.
Objectives: Evaluate in vitro the microtensile bond strength to dentin with OptiBond™ Universal® adhesive applied using a selective dentin etching adhesive strategy after thermal aging and to perform an ultramorphological analysis using scanning electron microscopy. Materials and methods: Thirty extracted healthy human permanent molar were used. After simulating the smear layer, the teeth were randomly distributed into three experimental groups (n = 10): SE (control) group – application of OptiBond™ Universal® according to self-etch; SDE1 group – application of OptiBond™ Universal using the selective dentin etching technique (application of 37 % orthophosphoric acid for 3 s); SDE3 group – application of three layers of OptiBond™ Universal® using the selective dentin etching technique. After application of the composite resin, the teeth were subjected to 10 000 thermocycles (5-55 ºC) and then cut into beams of 1 mm2 crosssection and subjected to microtensile forces in a universal testing machine (0.5 mm/min; 1 kN). The fractured surface of each toothpick was observed, and the failure was classified. The results were statistically analyzed with ANOVA one-way (α = 0.05). One toothpick per group was randomly selected for microscopic observation. Results: No statistically significant differences (p > 0.05) were found in the microtensile bond strength values between the three experimental groups. Most failures were adhesive and SEM images showed a uniform and intact hybrid layer in all groups. Conclusions: The application of OptiBond™ Universal® with a selective dentin etching adhesive strategy did not negatively affect dentin adhesion after thermocycling.
Objectives: Evaluate in vitro the microtensile bond strength to dentin with OptiBond™ Universal® adhesive applied using a selective dentin etching adhesive strategy after thermal aging and to perform an ultramorphological analysis using scanning electron microscopy. Materials and methods: Thirty extracted healthy human permanent molar were used. After simulating the smear layer, the teeth were randomly distributed into three experimental groups (n = 10): SE (control) group – application of OptiBond™ Universal® according to self-etch; SDE1 group – application of OptiBond™ Universal using the selective dentin etching technique (application of 37 % orthophosphoric acid for 3 s); SDE3 group – application of three layers of OptiBond™ Universal® using the selective dentin etching technique. After application of the composite resin, the teeth were subjected to 10 000 thermocycles (5-55 ºC) and then cut into beams of 1 mm2 crosssection and subjected to microtensile forces in a universal testing machine (0.5 mm/min; 1 kN). The fractured surface of each toothpick was observed, and the failure was classified. The results were statistically analyzed with ANOVA one-way (α = 0.05). One toothpick per group was randomly selected for microscopic observation. Results: No statistically significant differences (p > 0.05) were found in the microtensile bond strength values between the three experimental groups. Most failures were adhesive and SEM images showed a uniform and intact hybrid layer in all groups. Conclusions: The application of OptiBond™ Universal® with a selective dentin etching adhesive strategy did not negatively affect dentin adhesion after thermocycling.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Selective dentin etching Adesivos universais Adesão Resistência adesiva Termociclagem