Aim:The bone particles harvested during osteotomy could be used as autogenous bone graft materials to correct a bony defect prior to implant placement.Methods:A simple surgical procedure was described in which autogen...Aim:The bone particles harvested during osteotomy could be used as autogenous bone graft materials to correct a bony defect prior to implant placement.Methods:A simple surgical procedure was described in which autogenous bone was harvested from the drills during the preparation of implant sites.Eleven samples were obtained from bone drilling duringfixture installation in 11 patients(5 men and 6 women)with an average age of 57 years.These samples were subjected to histological preparation,in order to evaluate for the presence of viable osteoblasts.Results:Histological evaluation of the samples suggested that the viability of the bone tissue was maintained.Conclusion:The results show that this method of harvesting autogenous bone may be useful in situations where small amounts of bone are required.展开更多
Purpose The AstroBio Cube Satellite(ABCS)will deploy within the inner Van Allen belt on the Vega C Maiden Flight launch opportunity of the European Space Agency.At this altitude,ABCS will experience radiation doses or...Purpose The AstroBio Cube Satellite(ABCS)will deploy within the inner Van Allen belt on the Vega C Maiden Flight launch opportunity of the European Space Agency.At this altitude,ABCS will experience radiation doses orders of magnitude greater than in low earth orbit,where CubeSats usually operate.The paper aims to estimate the irradiation effect on the ABCS payload in the orbital condition,their possible mitigation designing shielding solutions and performs a preliminary representativity simulation study on the ABCS irradiation with fission neutron at the TAPIRO(TAratura Pila Rapida Potenza 0)nuclear research reactor facility at ENEA.Methods We quantify the contributions of geomagnetically trapped particles(electron and proton),Galactic Cosmic Rays(GCR ions),Solar energetic particle within the ABCS orbit using the ESA's SPace ENVironment information system.FLUKA(Fluktuierende Kaskade-Fluctuating Cascade)code models the ABCS interaction with the orbital source.Results We found a shielding solution of the weight of 300 g constituted by subsequent layers of tungsten,resins,and aluminium that decreases on average the 20%overall dose rate relative to the shielding offered by the only satellite's structure.Finally,simulations of neutron irradiation of the whole ABCS structure within the TAPIRO's thermal column cavity show that a relatively short irradiation time is requested to reach the same level of 1 MeV neutron Silicon equivalent damage of the orbital source.Conclusions The finding deserves the planning of a future experimental approach to confirm the TAPIRO's performance and establish an irradiation protocol for testing aerospatial electronic components.展开更多
文摘Aim:The bone particles harvested during osteotomy could be used as autogenous bone graft materials to correct a bony defect prior to implant placement.Methods:A simple surgical procedure was described in which autogenous bone was harvested from the drills during the preparation of implant sites.Eleven samples were obtained from bone drilling duringfixture installation in 11 patients(5 men and 6 women)with an average age of 57 years.These samples were subjected to histological preparation,in order to evaluate for the presence of viable osteoblasts.Results:Histological evaluation of the samples suggested that the viability of the bone tissue was maintained.Conclusion:The results show that this method of harvesting autogenous bone may be useful in situations where small amounts of bone are required.
基金the Italian Space Agency for co-funding the Cubesat 3U Astrobio ASI/INAF 2019-30-HH.0
文摘Purpose The AstroBio Cube Satellite(ABCS)will deploy within the inner Van Allen belt on the Vega C Maiden Flight launch opportunity of the European Space Agency.At this altitude,ABCS will experience radiation doses orders of magnitude greater than in low earth orbit,where CubeSats usually operate.The paper aims to estimate the irradiation effect on the ABCS payload in the orbital condition,their possible mitigation designing shielding solutions and performs a preliminary representativity simulation study on the ABCS irradiation with fission neutron at the TAPIRO(TAratura Pila Rapida Potenza 0)nuclear research reactor facility at ENEA.Methods We quantify the contributions of geomagnetically trapped particles(electron and proton),Galactic Cosmic Rays(GCR ions),Solar energetic particle within the ABCS orbit using the ESA's SPace ENVironment information system.FLUKA(Fluktuierende Kaskade-Fluctuating Cascade)code models the ABCS interaction with the orbital source.Results We found a shielding solution of the weight of 300 g constituted by subsequent layers of tungsten,resins,and aluminium that decreases on average the 20%overall dose rate relative to the shielding offered by the only satellite's structure.Finally,simulations of neutron irradiation of the whole ABCS structure within the TAPIRO's thermal column cavity show that a relatively short irradiation time is requested to reach the same level of 1 MeV neutron Silicon equivalent damage of the orbital source.Conclusions The finding deserves the planning of a future experimental approach to confirm the TAPIRO's performance and establish an irradiation protocol for testing aerospatial electronic components.
