Effect of acrylic resin stages on dimensional accuracy of denture bases polymerized by conventional cycle
DOI:
https://doi.org/10.14295/bds.2001.v4i3.127Resumen
O propósito desse estudo foi investigar a alteração dimensional das bases de prótese total influenciada pelos estágios da resina acrílica termopolimerizável Clássico, proporcionada e polimerizada de acordo com as instruções do fabricante. Quinze bases em cera foram confeccionadas e distribuídas aleatoriamente em três grupos de cinco amostras de acordo com os estágios da resina acrílica (fibrilar, plástico e borrachóide). A resina acrílica foi prensada em mufla metálica e submetida ao ciclo de polimerização em banho de água a 74ºC por 9 horas. Após esfriamento das muflas em temperatura ambiente, as bases de resina foram removidas, acabadas e fixadas nos modelos com adesivo instantâneo. O conjunto base de resina-modelo de gesso foi seccionado transversalmente em três cortes e a fenda entre base-modelo medida em cinco pontos para cada secção. Os resultados submetidos à análise de variância e ao teste de Tukey (5%) mostraram que a fase plástica apresentou valores de adaptação (0,210 mm) com diferença estatística significante (p<0,05) quando comparada com a fibrilar (0,231mm) e borrachóide (0,224mm). Em todos os estágios, os melhores resultados foram observados na secção A e os piores na secção C.
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