Efeito da escovação mecânica sobre a rugosidade superficial de reembasadores resilientes
Effect of mechanical brushing on the roughness of resilient denture liner materials
Hermann, C.; Mesquita, M.F.; Pigozzo, M.N.; Consani, R.L.X.; Henriques, G.E.P.
Rev. odontol. UNESP, vol.36, n1, p.35-40, 2007
Resumo
Este trabalho teve como objetivo avaliar o efeito da escovação mecânica sobre a rugosidade superficial de três materiais reembasadores resilientes considerados definitivos: dois à base de silicone, sendo um autopolimerizável (Sofreliner MS) e outro termopolimerizável (Molloplast-B), além de um reembasador resiliente de resina acrílica autopolimerizável (Dentuflex). Para a confecção das amostras, foram utilizadas matrizes de silicone polimerizado por reação de condensação incluídas em muflas vindo a obter-se um molde impresso no gesso, posteriormente preenchido com os materiais. Foram confeccionadas ao todo 30 amostras (10 de cada material), submetidas à leitura de rugosidade superficial num rugosímetro (SURFCORDER SE 1700 Kosaka Laboratory), tendo sido os valores obtidos em Ra. Em seguida, as amostras foram submetidas ao ensaio de escovação mecânica em uma máquina MSEt. O ensaio de escovação foi executado sob carga estática de 200 g, com movimentos lineares, totalizando 30.000 ciclos, e liberação de solução de dentifrício contendo água a cada um minuto sobre as amostras. Após os ensaios, foram executadas novas leituras de rugosidade superficial. Os valores obtidos foram submetidos à análise de variância (ANOVA) com medidas repetidas seguida do teste de Tukey em nível de 5% de significância. Inicialmente o material Dentuflex apresentou maior índice de rugosidade, seguido do Molloplast – B e do Sofreliner MS. Após a escovação, o material Dentuflex apresentou diminuição nos valores de rugosidade, o Sofreliner MS aumento (ambos estatisticamente significantes) e o Molloplast-B manutenção dos valores.
Palavras-chave
Prótese total, reembasadores resilientes, escovação mecânica
Abstract
The aim of this study was to evaluate the effect of mechanical brushing on the roughness of three resilient definitive lining materials: 1) auto (Sofreliner MS); 2) heat-polymerized (Molloplast-B) silicone based materials; and 3) auto-polymerized plasticized acrylic resin (Dentuflex). To prepare the samples, silicone rubber patterns were made and placed in a flask to obtain a cast pressed mold, and then filled with resilient lining materials. Thirty samples (10 for each denture liner) were prepared and submitted to surface roughness readings using a profilometer (SURFCORDER SE 1700 – Kosaka Laboratory). The roughness values were obtained in Ra (μm). After roughness measurements, the samples were submitted to a mechanical brushing simulation in an MSEt. The samples were submitted to 30.000 strokes with linear brushing movements, under a 200 g static load pressure. Toothpaste solution was injected every one-minute break. New readings of roughness were done, and the values were submitted to repeat measures analysis of variance (ANOVA) followed by Tukey’s test, with 5% of significance. Dentuflex showed the highest initial roughness values, followed by Molloplast-B and Sofreliner MS. After mechanical brushing, Dentuflex showed a decrease in the mean roughness value whereas Sofreliner MS showed an increase of values and Molloplast-B remained unaffected.
Keywords
Complete denture, denture soft liners, mechanical brushing
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