Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-01-12T14:20:00Z No. of bitstreams: 1 JoaoAndradeLopesDeSousa_DISSERT.pdf: 61529909 bytes, checksum: e210522b263ff132558591081dbd66de (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-01-18T14:02:46Z (GMT) No. of bitstreams: 1 JoaoAndradeLopesDeSousa_DISSERT.pdf: 61529909 bytes, checksum: e210522b263ff132558591081dbd66de (MD5) / Made available in DSpace on 2017-01-18T14:02:46Z (GMT). No. of bitstreams: 1 JoaoAndradeLopesDeSousa_DISSERT.pdf: 61529909 bytes, checksum: e210522b263ff132558591081dbd66de (MD5) Previous issue date: 2016-05-02 / O n?mero de implantes e a prefer?ncia dos mesmos em rela??o ?s pr?teses v?m crescendo a cada ano no Brasil, assim como os profissionais habilitados para tal procedimento. Com isso, ? necess?rio que haja estudos sistem?ticos sobre a din?mica que ocorre entre o par osso-metal no sistema. Utilizou-se osso su?no para a confec??o dos corpos-de-prova devido ao f?cil acesso ao material. Ensaiou-se e submeteu-se em laborat?rio o sistema a esfor?os de flexo-tor??o, quantificando-se o "backlash" (folga) ap?s 10^5 ciclos. Investigou-se tamb?m danos na estrutura ?ssea devido ?s solicita??es mec?nicas c?clicas aplicadas. Tamb?m se avaliou microscopicamente o conjunto parafuso-porca. Este estudo possibilitou identificar que a temperatura registrada durante a maioria dos ensaios manteve-se numa faixa entre 20 e 30?C, a acelera??o de vibra??o global e a press?o sonora demonstram que at? 10^4 ciclos o contato entre porca calota e parafuso da haste ? n?o conforme, com rugosidade elevada, confirmando a passagem pelo per?odo de running in do par tribol?gico metal-metal, enquanto que ap?s 10^4 ciclos h? o aumento par?metros, anteriormente citados, at? o t?rmino do ensaio, passando a existir um contato conforme no per?odo de regime permanente (steady steak). O Backlash mensurado identificou um valor m?ximo m?dio de 0,49mm. Debris, forma??o de proa, trincas e delamina??o foram observadas no MEV do osso e da porca-calota. O par osso-metal ainda foi submetido a um ensaio de tra??o, obtendo-se um gr?fico for?a versus deforma??o. / 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.