RÉSUMÉ
This paper presents a comprehensive review of natural fiber-reinforced composites (NFRCs) for lower-limb prosthetic designs. It covers the characteristics, types, and properties of natural fiber-reinforced composites as well as their advantages and drawbacks in prosthetic designs. This review also discusses successful prosthetic designs that incorporate NFRCs and the factors that make them effective. Additionally, this study explores the use of computational biomechanical models to evaluate the effectiveness of prosthetic devices and the key factors that are considered. Overall, this document provides a valuable resource for anyone interested in using NFRCs for lower-limb prosthetic designs.
RÉSUMÉ
Objetivo: este estudo avaliou a resistência à fratura de facetas confeccionadas sobre dois tipos de preparo. Métodos: utilizando-se dentes bovinos, dois grupos foram preparados: grupo I (redução incisal de 1 mm) e grupo II (redução incisal de 3 mm). Facetas laminadas foram enceradas sobre preparos dentais e confeccionadas em cerâmica IPS e.max (Ivoclar Vivadent). As superfícies internas das facetas foram tratadas com ácido fluorídrico a 10% durante 20 segundos e silanizadas. A superfície preparada do dente foi condicionada durante 15 segundos com ácido fosfórico a 37%, lavada abundantemente e secada levemente. O adesivo foi aplicado em duas camadas: dente e lado interno do laminado. A cimentação foi realizada com cimento resinoso fotopolimerizável sob pressão digital, e uma máquina de teste tipo pendular foi utilizada para simular o impacto no corpo-de-prova. Resultados: os dados de energia absorvida na fratura pelas facetas laminadas foram submetidos ao teste t de Student para amostras independentes (α = 5%), que demonstrou não haver diferença significativa entre os grupos com redução incisal de 1 mm e redução incisal de 3 mm (p=0,724). Observou-se, no grupo I, 10% das facetas laminadas com perda total, 30% extensa, mas parcial, e 60% parcial. Já no grupo II, 0% das facetas laminadas com perda total, 10% extensa, mas parcial, e 90% parcial. Conclusão: embora não tenha sido demonstradas diferenças na energia absorvida entre os dois tipos de preparo, o modo de fratura nos preparos com redução incisal de 3 mm foi mais favorável.
Objective: to evaluate the fracture resistance of laminate veneers on two preparation types. Methods: two groups were made based on bovine teeth: group I (1 mm incisal reduction) and group II (3 mm incisal reduction). All Laminate veneers were waxed over tooth preparations and fabricated with the IPS e.max ceramic (Ivoclar Vivadent). Their inner surfaces were treated with 10% hydrofluoric acid for 20 seconds and received a silane agent. The tooth surface was conditioned with 37% phosphoric acid, washed, and slightly dried. The adhesive was applied at the tooth and the laminate veneer. A photo-cured luting agent was used under fi nger pressure, and the samples were placed in an impact machine test. The fracture energy data was submitted to the Student´s t test for independent samples (5% significance level). Results: no statistical difference was observed (p = 0.724). At group I, 10% of the laminates demonstrated complete loss, 30% extensive but partial loss, and 60% partial loss. For group II, the figures were 0% for complete loss, 10% extensive but partial, and 90% partial. Conclusion: although no diff erences were seen for the absorbed energy, the 3 mm incisal reduction design was the most favorable.