Browsing by Author "Ribeiro, J.E.P.C."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Determination of optimal parameters in drilling composite materials to minimize the machining temperature using the Taguchi methodPublication . Lopes, A.C.; Fernandes, M.G.A.; Ribeiro, J.E.P.C.; Fonseca, Elza M MThis work aims to determine the best combination of drilling parameters which results in the smaller temperature during the bone drilling procedure. An experimental procedure was adopted with the acquisition of two biomechanical blocks from Sawbones (composite material) with similar properties to the human bone. The goal of this experiment resulted in a drilling process to assess the generated temperature on the drill bit and simultaneously on the bone material. The Taguchi method is a powerful tool in high quality system design, and proved that can be used as optimization method to determine the best parameters combination to obtain the minimum temperatures in the drilling process.
- Effect of drill speed on bone damage during drillingPublication . Fernandes, M.G.A.; Natal, R.; Fonseca, E.M.M.; Ribeiro, J.E.P.C.; Azevedo, L.The most usual causes of the failure in dental implant osseointegration are the mechanical damage linked with excessive levels of penetration force during drilling and thermal injury, because produce irreversible osteonecrosis. The result is weakened contact of implants with bone and loss of rigid fixation, which lead to delay the healing process. The main goal of this paper is to investigate the effect of drill speed on mechani-cal damage during drilling of solid rigid foam materials with similar mechanical properties to the human bone. Experimental tests were performed on biomechanical blocks instrumented with strain gauges in dif-ferent surface positions during the drilling process. A three-dimensional finite element model was devel-oped to simulate the drilling process and validated with experimental tests. Results of this study suggests that a drill bit with lower drill speed can reduce the strains and stresses in bone during drilling. The pro-posed numerical model reflected adequately the experimental results and could be useful in determination of optimal drilling conditions that minimize the bone injuries.