Avaliação da alteração dimensional de quatro siliconas por condensação através da medição tridimensional por coordenadas

Abstract

The purpose was to evaluate the dimensional changes of condensation silicone impressions by immediately, 30min, 1h and 7 days after impression, with the help of threedimensional measuring coordinate machine. The groups were divided in: G1: Speedex Putty/Speedex Light Body (Coltène/Vigodent S/A Ind and Com), G2: Optosil P Plus/Xantopren L Blue (Heraeus Kulzer GmbH), G3: Zetaplus Putty/Oranwash L (Zhermack SpA) and G4: Precise SX (Dentsply Ind and Com Ltda). To obtain 80 measurements of 4 material (n=20) was used a device consisting of a perforated tray and one another part with 3 pre-established indentations. For dimensional evaluation, the Crysta-Plus M574 machine (Mitutoyo) held each measurement 3 times at the established times and obtained the arithmetic mean. The final average of the 4 distances of I, II, III and IV the edentulous device was again applied. Statistical analysis was performed using the Kolmogorov-Smirnov test to reject the null hypothesis of asymmetric distribution. Subsequently, ANOVA was performed to compare the four materials simultaneously and Student's t parametric test to compare the 2 by 2 materials. The overall significance level of p≤0,05. The higher linear contraction was observed in Speedex, but was not significant (p=0,08). The Zetaplus Putty/Oranwash L seems to be more stable (p=0,99) but was not significant. There was no significant difference between any silicone condensation compared simultaneously in 4 times or compared 2 by 2, except, Precise SX and Speedex (p=0,05) in T3 time. All tested condensation silicones exhibit clinically acceptable dimensional change and can be leaked immediately, 30min, 1h and 7 days after impression.