Avaliação da resistência e módulo de elasticidade de osso mineralizado e desmineralizado pelos testes de microtração / Evaluation of the resistance and modulus of elasticity of bone mineralized and desmineralized for the tests of microtensile

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The loss of the alveolar bone as resulted of periodontal illness or second to the surgery is sources of innumerable complications for the surgeons dentists, and the solution for such problem if it bases on regenerative procedures. Regeneration is made through bone grafts that establish one scaffold for the tecidual repairing, increasing bone fabrics in the resultant defects of trauma or surgeries, filling the alveolous after extraction to preserve the height and thickness of the alveolar rigde and being increased and/or reconstructing the alveolar rigde. These procedures are carried through the use of autogenous, alografts, aloplastic or xenogenics grafts, having each one its characteristics and indications. With the development of the osseointegrated implants, it was seen necessity to keep a good amount and bone quality. This project has as objective to evaluate the resistance the traction and modulus of elasticity of the mineralized bone and desmineralized.of calvarium of rats, similar to determine initial standards (maximum and minimum) for comparisons with possible biomateriais of fulfilling of osteoinduction and osteoconduction. 24 animals divided in 2 groups had been used. Group 1 (n=12): modulus of elasticity being that we will use the two parietals of the animal, having made possible 24 specimens, subdivided in mineralized (n=12) and desmineralized (n=12). Group 2 (n=12): microtraction, being that 12 hemi-calvarium had been used for 12 the desmineralized sub-group and the others hemi-calvarium for the mineralized sub-group. After the death of the animals, the specimens will be collected and treated in accordance with the sub-group (mineralized and desmineralized). The tests had been carried through in a machine of universal test (Vitrodyme, V1000). The resistance averages the traction of the mineralized one was mineralized 129,814 ± 34.921 MPa and the desmineralized one was 18,547 ± 3,682 MPa. For the modulus of elasticity we got values of 1377,792 ± 208.331 MPa for the mineralized group and 49,669 ± 11,204 MPa for the desmineralized group, when comparing the resistance and modulus of elasticity the traction between the desmineralized and mineralized sub-group observes a estatistical significant difference for the mineralized group (p<0,001). Concluded that the microtraction test can be used to evaluate the mechanical properties in this biological experimental model.

ASSUNTO(S)

dental implants implantes dentários bone osso biocompatible materials materiais biocompatíveis

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