Objectives:The passive adaptation between the prothesis framecwork and the implant is a relevant point to this work success, a study was made comparing the two methods of making an unique prothesis supported by implant. Methods: One implant was included and tightened in the core of a resin block (3.75x10.0mm) and over it were screwed, using a torque of 20N/cm2, 15 machined universal castable long abutments (UCLA) with no laboratorial procedures (CG – control group). Using additon silicone mould, 15 teflon universal long abutments (UCLA) (56CNB, Conexão, Brazil) were screwed (20N/cm2), standart polished (plane vestibular face) and were casted in titanium (cast group – FG); 15 machined in titanium UCLA components (137 CNB, Conexão, Brazil) were standart polished as well as the previous ones and cast separatedly in titanium and laser welded to its respectives abutments. The marginal adaptation was observed in the implant/component interface under measuring microscope, in the ordinate (y axial) on four points of reference for vestibular, lingual, mesial and distal, previously marked on the block.Results: The arthmetical averages were obtained and the results were statistically treated (ANOVA) and submitted to the Tukey test for p=0.05. Significant differences were observed between the cast group (mean= 0.0362) and the laser welded group (mean= 0.0105). Conclusion: The laser welded group showed the smallest values of distorsion in the y axial (ordinate).

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