Avaliação sobre efeito da termociclagem na rugosidade superficial de bases de próteses removíveis de polimetilmetacrilato e poliamida : Pesquisa in vitro

Abstract

Polyamide is a base material for prostheses that emerged as an alternative to conventional acrylic resin (polymethyl methacrylate). Among its main attractions are its flexibility, elasticity, and aesthetics, as it does not require metal frameworks in partial removable prostheses. This study compared the effect of artificial aging, simulated by thermocycling, on the surface roughness of two resins used for removable prosthesis bases: polyamide and polymethyl methacrylate (PMMA). Twenty specimens were used, 10 of each material, which underwent a thermocycling process (10,000 cycles of 60s, varying between temperatures of 5 and 55°C), and surface roughness readings were taken before and after the accelerated aging process. The results indicated a significant increase in the level of surface roughness of the polymethyl methacrylate group specimens compared to polyamide after aging. Statistical analysis confirmed that both the type of resin and the time of exposure to thermocycling significantly influenced roughness. However, further studies are needed to confirm these resultsand evaluate long-term clinical performance.