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The objective of this study was to evaluate the reproduction potential of the palate area and the position of abutments in partially edentulous, upper stone casts produced with three impressions techniques: 1) irreversible hydrocolloid in stock tray AL; 2) zinc oxide-eugenol paste in a custom tray with a pick-up impression of irreversible hydrocolloid MS and 3) putty-wash condensation silicone in stock tray SC. Representative points on the palatal surface and the relative distance between the abutments as well their inclination were measured with a threedimensional coordinate measurement equipment and the data used to analyze the fidelity of the casts in relation to the original metal model. The results showed: 1) positive and negative vertical discrepancies on casts made from all impression techniques, with SC responsible for the highest variations (predominantly negatives) that rendered casts with a deeper palatal vault when compared to those obtained with AL and MS; 2) positive and negative horizontal discrepancies on casts produced from all impression techniques, with AL and SC tending to increase the distances between supports while MS seemed to decrease these distances; 3) the angular deviations observed represented no substantial compromise to the axial inclination of the abutment when considering the stability of the removable prosthesis framework; 4) the discrepancies evidenced with the three techniques were within the benchmark values for clinical acceptability initially established.

Avaliação in vitro da precisão de três técnicas para moldagem do arco superior parcialmente edentado