masterThesis
Passividade na interface prótese/pilar intermediário de infraestrutura implantossuportadas confeccionadas pela tecnologia CAD/CAM e método convencional
Fecha
2014-08-28Registro en:
ARAÚJO, Gabriela Monteiro de. Passividade na interface prótese/pilar intermediário de infraestrutura implantossuportadas confeccionadas pela tecnologia CAD/CAM e método convencional. 2014. 49 f. Dissertação (Mestrado em Saúde Pública) - Universidade Federal do Rio Grande do Norte, Natal, 2014.
Autor
Araújo, Gabriela Monteiro de
Resumen
The objective of this research was to evaluate the passivity and strain induced in
infrastructures screwed on abutments, made by CAD/CAM technology, and to compare these
samples with parts manufactured by conventional casting. Using CAD/CAM technology, 4
samples were made from zirconia (Zircad) and 4 samples were manufactured from cobaltchrome
(CoCrcad). The control groups were 4 specimens of cobalt-chrome, made by onepiece
casting (CoCrci), for a total of 12 infrastructures. To evaluate the passivity, the
infraestructures were installed on the abutments. One end was tightened and the vertical gap
between the infrastructure and the prosthetic abutment was measured with scanning electron
microscopy (250×). The mean strain in these infrastructures was analyzed via the
photoelasticity test. A significant difference (p = 0.000) in passivity was observed between
the control (CoCrci) and sample groups (CoCrcad and CoCrci). CoCrcad exhibited the best
value of passivity (48.76 ± 13.45 μm) and CoCrci the worst (187.55 ± 103.63 μm), Zircad
presented an intermediate value (103.81 ± 43.15 μm). When compared to the other groups,
CoCrci showed the highest mean strain around the implants (17.19 ± 7.22 kPa). It was
concluded that the zirconia infrastructure made by CAD / CAM showed a higher vertical
marginal misfit than those made in cobalt-chromium alloy with the same methodology,
however, the tension generated in the implants was similar. The CAD/CAM technology is
more accurate for passivity and mean strain of infrastructure screwed on abutments than
conventional manufacturing techniques