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Resistência adesiva ao esmalte, de um sistema adesivo universal experimental sem Bis-GMA, na vertente etch-and-rinse
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Abstract(s)
As técnicas adesivas são fundamentais na medicina dentária, sendo indispensável a
escolha de um sistema adesivo com elevada eficácia e durabilidade.
Objetivo: Avaliar a resistência adesiva ao esmalte, por microtração, de um sistema
adesivo universal experimental sem Bis-GMA e de sistemas adesivos universais com Bis-GMA, na vertente etch-and-rinse.
Material e Métodos: Utilizaram-se 10 dentes molares hígidos, sem cáries nem
restaurações, extraídos por motivos periodontais ou ortodônticos há menos de 6 meses.
Num micrótomo de tecidos duros, foram realizados cortes no sentido vestíbulo-lingual,
de forma a se obter 2 espécimes por dente, totalizando 20 espécimes. Seguidamente a
smear layer é simulada através do polimento das faces interproximais com lixa SiC de
600 grit.
Após o corte dos espécimes, foram distribuidos aleatoriamente em 4 grupos de n=5, sendo agrupados de acordo com o sistema adesivo utilizado. Para todos os grupos foi utilizado o protocolo etch-and-rinse: Grupo 1 - Scotchbond Universal; Grupo 2 - Futurabond M+; Grupo 3 – EM1, sistema adesivo universal experimental com Bis-GMA; Grupo 4 - EM2, sistema adesivo universal experimental sem Bis-GMA. Posteriormente confecionaram-se blocos de resina composta fotopolimerizável com 6 a 8 mm de altura e armazenaram-se numa estufa de incubação a 37ºC, durante 24 horas. Finalmente, os dentes foram cortados nas direções X e Y num micrótomo de tecidos duros em palitos com 1 mm2 de secção transversal e sujeitos a forças de tração de 0,5mm/min numa máquina de testes universal, até à fratura, de modo a avaliar a resistência adesiva de cada grupo.
A validação dos dados obteve-se com recurso a várias matrizes de covariância homogénea e usando o critério de informação de Akaike e o Critério Bayesiano de Schwarz.
Resultados: Não existem diferenças significativas entre adesivos no que diz respeito aos
valores da força adesiva (p = 0,237).
Conclusões: O sistema adesivo universal experimental sem Bis-GMA apresentou uma
resistência adesiva semelhante aos restantes adesivos estudados.
Adhesive techniques are fundamental in dentistry, and it is essential to choose an adhesive system with high efficiency and durability. Objective: To evaluate the adhesive resistance to enamel, by microtensile bond strength, of an experimental universal adhesive system without Bis-GMA and of universal adhesive systems with Bis-GMA, in the etch-and-rinse approach. Material and Methods: 10 healthy molar teeth were used, without caries or restorations, extracted for periodontal or orthodontic reasons less than 6 months ago. In a microtome of hard tissues, cuts were made in the buccolingual direction, in order to obtain 2 specimens per tooth, obtaining a total of 20 specimens. The smear layer was then simulated by polishing the interproximal faces with 600 grit SiC sandpaper. After being cut, the specimens were randomly distributed in 4 groups of n = 5, wich were sorted according to the adhesive system used. The etch-and-rinse protocol was applied in all groups: Group 1 - Scotchbond Universal; Group 2 - Futurabond M+; Group 3 - EM1, experimental universal adhesive system with Bis-GMA; Group 4 - EM2, experimental universal adhesive system without Bis-GMA. Then blocks of resin 6 to 8 mm high were made using a photopolymerizable composite resin, and subsequently stored in an incubation oven at 37ºC for 24 hours. Finally, the teeth were cut in the X and Y directions in a microtome of hard tissues on beams with a cross-section of 1 mm2 and subjected to traction forces of 0.5 mm/min in a universal testing machine, until fracture, in order to evaluate the adhesive strength of each group. Data validation was obtained using several homogeneous covariance matrices and using the Akaike information criterion and the Schwarz Bayesian criterion. Results: There are no significant differences between adhesives with regard to the values of adhesive strength (p = 0.237). Conclusions: The experimental universal adhesive system without Bis-GMA showed an adhesive resistance similar to the other studied adhesives.
Adhesive techniques are fundamental in dentistry, and it is essential to choose an adhesive system with high efficiency and durability. Objective: To evaluate the adhesive resistance to enamel, by microtensile bond strength, of an experimental universal adhesive system without Bis-GMA and of universal adhesive systems with Bis-GMA, in the etch-and-rinse approach. Material and Methods: 10 healthy molar teeth were used, without caries or restorations, extracted for periodontal or orthodontic reasons less than 6 months ago. In a microtome of hard tissues, cuts were made in the buccolingual direction, in order to obtain 2 specimens per tooth, obtaining a total of 20 specimens. The smear layer was then simulated by polishing the interproximal faces with 600 grit SiC sandpaper. After being cut, the specimens were randomly distributed in 4 groups of n = 5, wich were sorted according to the adhesive system used. The etch-and-rinse protocol was applied in all groups: Group 1 - Scotchbond Universal; Group 2 - Futurabond M+; Group 3 - EM1, experimental universal adhesive system with Bis-GMA; Group 4 - EM2, experimental universal adhesive system without Bis-GMA. Then blocks of resin 6 to 8 mm high were made using a photopolymerizable composite resin, and subsequently stored in an incubation oven at 37ºC for 24 hours. Finally, the teeth were cut in the X and Y directions in a microtome of hard tissues on beams with a cross-section of 1 mm2 and subjected to traction forces of 0.5 mm/min in a universal testing machine, until fracture, in order to evaluate the adhesive strength of each group. Data validation was obtained using several homogeneous covariance matrices and using the Akaike information criterion and the Schwarz Bayesian criterion. Results: There are no significant differences between adhesives with regard to the values of adhesive strength (p = 0.237). Conclusions: The experimental universal adhesive system without Bis-GMA showed an adhesive resistance similar to the other studied adhesives.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Etch-and-rinse Resistência adesiva G-IEMA Sistemas adesivos universais