Ajuste Vertical de Pilares Tipo UCLA. Maquinados v/s Colado.

Objective: One of the important problems of Implants Restoration it is loosen of the rehabilitation system components, and this has been frequently linked to the quality of the adjustment among them. This study compare the adjustment and vertical fit of the faying surfaces betweens implants and abutment obtained by means machined prefabrication and plastic burnout cast.
Material and Method: The selected model was twelve implant (external connection and 3.75 mm. platform) and twelve compatible UCLA type abutments. Three groups of four models: (1) Implant with “Gold Machined Abutment”, (2) Implant with “Gold Cast Abutment”, and (3) Implant with “Chromium-Nickel Cast Abutment”. Per each combination of implant-abutment, a titanium alloy screw for UCLA abutment was used, fit with 32 Ncm.
Results: The gap average for the “Gold Machined Abutment” was 4.77 µm, for the “Gold Cast Abutment” group was 8.48 µm, and for “Chromium-Nickel Cast Abutment” group was 8.06 µm.  The differences are significant between the groups of “Gold Machined Abutment”, in comparison to the groups with “Gold Cast Abutment” and “Chromium-Nickel Abutment”.
Conclusions: When implants and abutment are assembled exist a gap between these structures. The better precision of the vertical adjustment was observed when using machined abutment. Between the cast abutments were not observed means differences, and in both the greater gap dimension are located in the peripheral zones of the faying surface between implants and abutment.