Influência da polidopamina na resistência de união adesiva entre o poli-éter-cetona-cetona (PEKK) e os compósitos de revestimento estético
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Data
2021-10-26
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo do presente estudo foi analisar o efeito da polidopamina como agente de união do compósito de revestimento estético ao poli-éter-cetona-cetona (PEKK). Foi realizado um estudo in vitro, randomizado, cuja variável dependente foi a resistência de união ao cisalhamento. Cento e oito amostras de PEKK foram confeccionadas em forma de cilindro (1 cm de diâmetro). A superfície foi então polida e os corpos de prova foram limpos em banho ultrassônico. A rugosidade inicial média foi padronizada em 0,20 μm. Foram considerados: 1) pré-tratamento mecânico: com e sem abrasão a ar com Al2O3; 2) sistema adesivo: pekk bond, polidopamina (2 mg/ml) e sem aplicação de adesivo; 3) cor do compósito de revestimento: cor de dente e cor de gengiva. O teste de cisalhamento foi realizado em máquina de ensaio universal, com velocidade constante e tensão crescente. Os dados analisados por ANOVA fatorial (com post-hoc de Sidak) usando o software SPSS (α = 0,05). Houve diferença estatística entre os sistemas adesivos dentro dos grupos de pré tratamento, com maiores resultados para o grupo que recebeu a aplicação do pekk bond (P < 0,0001), enquanto os menores valores foram relacionados à aplicação da polidopamina (P < 0,0001). Além disso, o tempo de imersão (P=0,979) e as diferentes concentrações utilizadas de polidopamina (P=0,678) não influenciaram na resistência de união dos compósitos de revestimento estético à superfície do PEKK. Não houve diferença estatística entre os sistemas adesivos na comparação “intergrupos” para o fator pré-tratamento nos espécimes de cor de dente. Para os espécimes de cor de gengiva, o jateamento aumentou significativamente a resistência adesiva dos grupos “polidopamina” (14,69 para 22,42 MPa) (P = 0,017) e sem adesivo (32,76 para 42,76 Mpa) (P = 0,002). Por fim, a análise estatística mostrou que melhor desempenho do compósito com cor de gengiva, exceto no grupo em que a polidopamina foi aplicada nos espécimes sem nenhum pré-tratamento (P = 0,28). Concluiu-se que a aplicação da polidopamina não melhora a interface adesiva, independente da concentração e do tempo de aplicação sobre os polímeros.
The aim of the present study was to analyze the effect of polydopamine as a bonding agent for the esthetic coating composite to poly-ether-ketone-ketone (PEKK). An in vitro, randomized study was carried out, whose dependent variable was the shear bond strength. One hundred and eight PEKK samples were made in a cylinder shape (1 cm in diameter). Then the surface was polished and the specimens were cleaned in an ultrasonic bath. The initial mean roughness was standardized at 0.20 µm. Were considered: 1) mechanical pretreatment: with and without air abrasion with Al2O3; 2) adhesive system: pekk bond, polydopamine (2 mg/ml) and without application of adhesive; 3) Composite coating color: tooth color and gum color. The shear test was performed in a universal testing machine, with a constant speed and increasing tension. Data was analyzed by factorial ANOVA (with Sidak post-hoc) using SPSS software (α = 0.05). There was a statistical difference between the adhesive systems within the pre-treatment groups, with greater results for the group that received the application of pekk bond - (P < 0,0001), while the lowest values were related to the application of polydopamine (P < 0,0001). Furthermore, the immersion time (P=0.979) and the different concentrations used of polydopamine (P=0.678) did not influence the bond strength of the esthetic coating composites to the PEKK surface. There was no statistical difference between adhesive systems in the “ intergroup” comparison for the pre-treatment factor in the tooth-colored specimens. For specimens with gingiva color, sandblasting significantly increased the bond strength of the groups “polydopamine” (14.69 to 22.42 MPa) (P = 0.017) and without adhesive (32.76 to 42.76 MPa) (P = 0.002). Finally, the statistical analysis showed better performance of the composite with gingiva color, except in the group in which polydopamine was applied to specimens without any pretreatment (P = 0.28). It was concluded that the application of polydopamine does not improve the adhesive interface, regardless of concentration and application time on the polymers.
The aim of the present study was to analyze the effect of polydopamine as a bonding agent for the esthetic coating composite to poly-ether-ketone-ketone (PEKK). An in vitro, randomized study was carried out, whose dependent variable was the shear bond strength. One hundred and eight PEKK samples were made in a cylinder shape (1 cm in diameter). Then the surface was polished and the specimens were cleaned in an ultrasonic bath. The initial mean roughness was standardized at 0.20 µm. Were considered: 1) mechanical pretreatment: with and without air abrasion with Al2O3; 2) adhesive system: pekk bond, polydopamine (2 mg/ml) and without application of adhesive; 3) Composite coating color: tooth color and gum color. The shear test was performed in a universal testing machine, with a constant speed and increasing tension. Data was analyzed by factorial ANOVA (with Sidak post-hoc) using SPSS software (α = 0.05). There was a statistical difference between the adhesive systems within the pre-treatment groups, with greater results for the group that received the application of pekk bond - (P < 0,0001), while the lowest values were related to the application of polydopamine (P < 0,0001). Furthermore, the immersion time (P=0.979) and the different concentrations used of polydopamine (P=0.678) did not influence the bond strength of the esthetic coating composites to the PEKK surface. There was no statistical difference between adhesive systems in the “ intergroup” comparison for the pre-treatment factor in the tooth-colored specimens. For specimens with gingiva color, sandblasting significantly increased the bond strength of the groups “polydopamine” (14.69 to 22.42 MPa) (P = 0.017) and without adhesive (32.76 to 42.76 MPa) (P = 0.002). Finally, the statistical analysis showed better performance of the composite with gingiva color, except in the group in which polydopamine was applied to specimens without any pretreatment (P = 0.28). It was concluded that the application of polydopamine does not improve the adhesive interface, regardless of concentration and application time on the polymers.
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Adesivos, Polímeros, Resinas compostas, Resistência ao cisalhamento, Adhesives, Composite resins, Polymers, Shear strenght