Objectives:The aim of this paper was to analyze “in vitro” the level of passive fit of a fixed prosthesis with 3 units screwed in 2 implants using laser and conventional weldings. Methods: The study was based on the data from 12 specimens that were made of an alloy of silver palladium (pors-on IV DEGUSSA DENTAL - Sao Paulo - Brazil) from an acrylic resin cast made in advance. This cast had the 2 implants that supported the prosthesis. Each specimen reproduced a fixed prosthesis of 3 units in its metallic part. Such specimens were divided into 2 groups: group 1 the structures were linked by the conventional welding and group 2 the pieces were welded by laser. After finishing the specimens they were led to the acrylic resin cast and screwed with a 20 N/cm torch. The study was made by two observations; one of them with the framework screwed just in the first abutment and the second one was made with the framework screwed on both abutments. The observations of the misfit were done in a measurescope, NIKON JAPAN microscope. Results:the results were submitted to a statistics analysis by an ANOVA test. Groups 1 and 2 showed a similar level of misfit.Conclusion: For 3 units prosthesis there are no stastistical differences between laser and conventional weldings.

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