Influência da plataforma protética na distribuição de tensões em implantes extracurtos: in silico e in vitro

Abstract

The aim of the study was to evaluate through Finite Elements (FEA) and Extensometer the biochemical benefit of the prosthetic connections as for the distribution of tensions for the perimplant bone cloth, implants and components, when we use extra short implants in subsequent regions of atrophic jaw. For evaluation for extensiometry twenty bodies of proof were made and divided in two groups: Group Splinted Morse Taper (SMT) and Splinted External Hexagon (SEH), each body constituted by two extra short implants of 5 x 4 mm concentrated on a block of polyurethane. On the implants prosthetic crowns were installed when crown / implant of 2:1 screwed relative to the first and second thing molars with a proportion. The bodies of proof were subjected to a load of de 120N in a machine of mechanical fatigue, when there registered the values of the deformation suffered in the model of polyurethane through extensometers fixed on basis of the polyurethane. For evaluation by FEA a three-dimensional model was raised simulating virtually the same situation, being the values of bone deformation cortical and to run through registered. A less deformation was observed in the FEA in the group SMT, 0.0095μs for the bone cortical and 0.028 μs for the medullar bone, and in the extensometry the group SMT presented less deformations in the bone cortical, in the regions distal, lingual and college entrance exam of the corresponding implant to the first molar (p 0,016, 0,028 and 0,028 respectively) .With that we end that the platform Morse Taper favored a less bone marginal deformation and a better uniformity in distribution of tension for the prosthetic component when we use extra short implants.