METHOD:A self-cured (Jet® Classic) master cast was constructed, simulating a completed edentulous arch. Some cavities were prepared in predeterminate positions with dental amalgam. In the center of each cavity a hole was made and reproduced lately in the proof bodies. These holes were used as reference to measure the bodies obtained vertical and horizontally, from conventional and double impression. Fourteen casts, using irreversible hydrocolloid, were obtained with the two techniques: seven from the double impression technique and seven from the conventional one. The casts were poured with gypsiun type IV (Herostone®,Vigodent). The distances among the reproduced holes in the bodies were measured with a digital pachymeter (Digimatic Caliper®, Mitutoyo Corp.).
RESULTS: The results were submitted to Analysis of Variance (ANOVA), with critical value of 3,32 and TUKEY`s test, both at the level of significance of 5% . There was no statistically significant difference between the two techniques.
CONCLUSION: It can be concluded that the use of the double impession technique with irreversible hydrocolloid without blockout is as well indicated as the conventional one.