Avaliação in vitro da resistência à flexão de uma resina acrílica em uma estrutura implanto-suportada

Abstract

Provisional Prosthesis in acrylic resin have been used in protocols of immediate load, with the objective to immobilize the implants in the first weeks after the surgery, not being told, however, the final dimensions of this structure to resist chewing loads. In a work in vitro objectifying to determine which total the load that a structure in autopolymerizing acrylic resin was capable to support in the region of cantilever weretested 18 structure in the thicknesses of 8(G8), 10(G10) and 12(G12) mm. Its were confectioned with autopolymerizing acrylic resin Jet Tooth Shade. The structures were mounted on 4 implantations that settled in a metallic base, and they had received a load vertical line in the cantilevered distal extremity. The tests showed results, for bending of the structures under load of 200 N, the average values of 0,40, 0,34 and 0,30 mm for the thicknesses of 8, 10 and 12 mm respectively; and for theresistance to the breaking of the structures, the values of 430, 655 and 778 N for G8, G10 and G12 respectively. The test of multiple comparison of Scheffé indicated that the bending suffered for the structures of the G8 group was not significantly different of the structures of the G10 group (P=0.196), but were significantly bigger that the bending of the structures s of the G12 group (P = 0.021). The bending suffered for the structures of the G10 group was not significantly different of the ones of the G12group (P=0.536). The resistance to the breaking of the G8 was significantly lesser that of the G10 (P=0.003) and G12 (P<0.001). The resistance to breaking of the G10 significantly did not differ from the G12 (P=0.113). It concluded that all the tested structures had shown capacity to application in implant-supported fixed prosthesis.