Tribologia de um inserto metal-osso maxilar

Abstract

The number of implants and the preference of the same in relation to prostheses have been growing every year in Brazil, as well as professionals for such a procedure. With this, a systematic study is needed on the dynamic that occurs between the pair bone-metal in the system. Swine’s bone was used for making specimen due to easy access to the material. It was tested and subjected to laboratory system flexo-torsional stresses, backlash was quantified after 105 cycles. It also was investigated damage in the bone structure due to the applied cyclic mechanical stress. Also microscopically assessed the screw-nut assembly. This study identified that the temperature during most assays was maintained in a range between 20 and 30 ° C, global vibration velocity and sound pressure showed that up to 104 cycles, the contact between nut-cap and screw of the stem is counterformal contact, with high roughness, confirming the passage of the running-in period or tribological metal-metal pair softening, whereas after 104 cycles for increased parameters mentioned above by the end the test, starting to be a contact as the steady steak period. The measured Backlash identified a maximum value of 0.49 mm. Debris, prow formation, cracks and delamination were observed in SEM bone and nut-cap. The metal-bone pair was also subjected to a tensile test, yielding a graph force versus deformation.