Avaliação da resistência à tração e módulo de elasticidade após reparo ósseo de enxertos de osso bovino e polímero de mamona

Abstract

To apply the grafts techniques to repair tooth alveolus is a challenging task to modern Dentistry due to the low regeneration capacity of this alveolar tissue. The objective of the present work was to evaluate a new biomaterial to be used in grafts. The tensile resistance and the elasticity modulus of the repaired bones were analyzed. Two biomaterials were tested: inorganic medullar bovine bone (Gen-ox), Baumer S.A. Mogi Mirin SP) and castor bean polymer (Poliquil Araraquara Produtos Quimicos Ltda, Araraquara, SP) and 40 male adult albino Wistar rats (Ratus norvegicus) were used, weighting between 250 - 300g, distributed in 4 groups (n=10) (G1,G2,G3,G4). The groups G1 and G2, designed as control group, did not receive grafts. In the groups G3 and G4 were created non critics defects of 3mm using a trephined bur on the calvaria region; The G3 group received the bovine bone and the G4 group received the castor oil polyurethane. Animals were sacrificed at 6 months post-surgery, when biopsies were collected and mechanically tested in the universal tensile test machine Vitrodyne, model V1000 (Liveco Inc., Burlington,VT). The results were analyzed comparatively using the non-parametric Kruskal-Wallis test, followed by the pos-test Student-Newman-Keuls. The Software SigmaStat-2.0 was used for statistical analysis, considering significant differences when the “p” value was under 0,05. The bone of the G4 group presented greater tensile resistance than the bone of the G3 group, while the elasticity modulus presented no significant difference for both implanted materials.