Comparación de la resistencia a la flexión de dos marcas de resinas acrílicas para prótesis provisionales con refuerzo de fibra, procesadas a diferentes temperaturas.

Abstract

Dental literature has been concerned about provisional restorations longevity because in order to extend their permanence inside oral cavity they must present higher resistance and quality properties. The aim of this study was to determine if higher flexural strength values could be obtained when polymerization temperature is increased and with the addition of fibres to polymethylmethacrylate acrylic resins and bis-acrylic resins. Specimens were divided into 8 groups. In some specimens, polyethylene fibres were added and they were immersed in water at 60°C, while other specimens were immersed at 23°C. Then, the specimens were pressed until polymerization has occurred. The results obtained show that bis-acrylic resin without fiber addition at 23°C is more resistant than the same resin with fiber at the same temperature and with or without fibre at 60°C. However, fibre addition to both materials prevents fracture formation that could result in the separation of both segments.