Surface roughness analysis of acrylic resin for provisional crowns under different commercial brands / Análise da rugosidade superficial de diferentes marcas comerciais de resina acrílica para coroas provisórias

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Provisional crowns have some features that may compromise aesthetics and favors adherence of microorganisms and dental plaque formation. Previous studies have shown that processing may influence roughness and porosity of acrylic resins commonly used make provisional crowns. Because the several commercial resins available present differences in their quality the aim of this study was to evaluate the surface roughness of four commercial brands of acrylic resins (Dencor, Vipi, Duralay and Alike) according to four manipulation techniques (two direct and two indirect): GROUP I - autopolimerization under pressure in a silicone matrix; GROUP II autppolimerization in flask; GROUP III - autopolimerization using the bead brush technique; GROUP IV - autopolimerization after mixing in dappen dish. For each type of processing 12 specimens were made of each material, being 48 specimens for each group and 192 specimens in total. After specimens preparation, surface roughness tests (Ra) was performed using a rugosimeter / profilometer. Posteriorly, all surfaces were polished for standardization and same roughness tests were performed again. Before finishing and polishing, the results pointed out that Vipi resin presented the highest roughness (4.074 ± 0.541). Mixing the resin in dappen dish group IV (3.538 ± 0.509) also presented the highest roughness values regarding the technique. The lowest roughness values were found with Alike resin (2.671 ± 0.512) and flask technique group II (2.733 ± 0.470). After finishing and polishing techniques, the highest roughness was found with Vipi resin (0.207 ± 0.032) and the autopolimetization under pressure in silicone matrix technique - group I (0.172 ± 0.037). The lowest roughness values were found with Alike resin (0.113 ± 0.036) and flask technique group II (0.138 ± 0.027). With these results, it was possible to conclude that the best combination for making provisional crowns was the flask technique associated with Alike resin.

ASSUNTO(S)

coroas provisórias resinas acrílicas acrylic resins provisional crowns surface roughness rugosidade de superfície polimento de superfície surface polishing

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