Adaptação das bases de protese total superior sob influencia da interação gessos de inclusão e tempos pos-prensagem da resina acrilica

AUTOR(ES)

Rodrigo Luiz dos Santos Sousa

DATA DE PUBLICAÇÃO

2002

RESUMO

This study evaluated the complete maxillary denture base adaptation under the effect of the flasking plaster combination (II x III and III x IV types) and post-pressing time (immediate and 24 hours). The bases were made with Clássico heat cured acrylic resin, polymerized in water bath at 74°C for 9 hours. The casts were made with type III plaster stone and the bases made with two wax plates of 0.9 mm. After the bases were processed by the routine technique, the stone cast and the resin bases were fixed with instantaneous adhesive and then transversally sectioned in three zones corresponding to distal of canine (A), mesial of first molars (8), and posterior palatal region (C). The adaptation levei was measured in an Olympus linear comparator microscope, with accuracy of 0.0005 mm. The data were submitted to the ANOVA and Tukey s test (5%). The results showed that there were no statistically significant differences (p<0.05) on the adaptation between the flasking plaster combination II x III (0.224) and IV (0.238 mm). The mean value at the immediate post-pressing time (TO)(0.257 mm) was statistically different from the levels of adaptation at the post-pressing time of 24 hours (T24) (0.205 mm). The best adaptation values were obtained with the flasking plaster combination II x III, when cut A (0.181 mm) was more adapted than cut 8 (0.224 mm) and C (0.268 mm). On the flasking plaster combination II x IV, the best mean value was also obtained in cut A (0.177 mm), followed by 8 (0.262 mm) and C (0.323 mm). All the mean values presented were statistically different for TO and T24. At immediate post pressing time (TO), the highest adaptation was at cut A (0.187 mm), followed by cut 8 (0.262 mm) and C (0.323 mm), with statistical differences (p<0.05). At the post-pressing time of 24 hours (T24), the best adaptation levei was at cut A (0.171 mm) with statistical difference from cut 8 (0.199 mm) and C (0.246 mm) (p<0.05)

ASSUNTO(S)

protese dentaria resinas acrilicas

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