19 documents found, page 1 of 2
Mudança transitória da cor da pele e pelo após tricotomia da região sacrococcíg...
Dourado, Amândio José Soares; Cordero, Ignacio Sández; Rodrigues Gomes, Anabela Filipa; Lobo, Luís Pedro Rodrigues de Lima; Dias, Maria Isabel RibeiroA clinical case in which skin and hair color change occurred after sacrococcygeal epidural anesthesia in a nine-month-old Siamese cross queen undergoing ovariohysterectomy (OHE) is described. Six weeks after surgery, during a re-check, it was noted that in the sacrococcygeal region the color of the skin and new hair growth was dark with a color comparable to the color present on the body extremities (muzzle, pi...
Osteosynthesis metal plate system for bone fixation using bicortical screws: nu...
Olmos, Andrea Alexandra Rodrigues; Fertuzinhos, Aureliano Costa; Dias, Maria Isabel Ribeiro; Pereira, Fábio André MagalhãesThis work describes the numerical modelling of an immobilization system currently used to repair long bone fractures. The referred system was employed to ensure the mechanical stabilization of an oblique bone fracture by means of a dynamic compression plate (DCP) and bicortical screws. The numerical characterization of the fixation system was performed to obtain stress and strain fields in cortical bone tissue....
Effect of drill speed on the strain distribution during drilling of bovine and ...
Fernandes, M.G.A.; Fonseca, E.M.M.; Jorge, Renato N.; Manzanares, Cristina; Dias, Maria Isabel RibeiroDrilling is an operation commonly required in orthopaedic surgery for insertion of screws and internal fixation of bone fractures. Induced damage is one of the undesired effects of drilling mainly due to the use of inadequate drilling parameters. During the recent years, scientists have been trying to describe the relationship between drilling parameters and bone injury. However, no studies have examined the le...
Strain analysis in the drilling of human and bovine bone
Fernandes, M.G.A.; Fonseca, E.M.M.; Natal, Renato; Manzanares, Cristina; Dias, Maria Isabel RibeiroThe growing importance of boné surgical drilling procedures hás moíivated the development ofassessment methods aimed to preveni boné injiiry. Different studies on the parameters influencing boné drilling have been published. However, most of the results are based only in the analysis of temperatures. There is a lack of information on the mechanical damage on boné, especially about boné tissue swface integrity a...
Thermal analysis in drilling of ex vivo bovine bones
Fernandes, M.G.A.; Fonseca, E.M.M.; Jorge, Renato N.; Vaz, Madalena; Dias, Maria Isabel RibeiroBone drilling is a common procedure in Medicine, mainly in traumatology and orthopedic procedure for fractures fixation and in reconstructive surgery. The success of this surgical procedure is dependent on many factors, namely, on heat generation control during the bone drilling. The main concern in bone drilling is the mechanical and thermal damage of the bone induced by inappropriate parameters such as drill ...
Temperature evaluation in ex-vivo bovine bones submitted to drilling processes
Fernandes, M.G.A.; Fonseca, E.M.M.; Natal, Renato; Dias, Maria Isabel Ribeiro; Lopes, Ana Catarina Oliveira; Ribeiro, J.E.A necrose óssea induzida durante o processo de furação é um fenómeno frequente que contribui para problemas pós-operatórios. O calor de fricção gerado pelo contato entre a broca e a parede do furo é inevitável. No entanto, a utilização de técnicas avançadas para a obtenção do registo térmico durante a furação óssea é importante para a garantia da qualidade durante a furação. O objetivo deste estudo é apresentar...
Experimental study of temperatures during drilling of ex-vivo bovine bones
Fernandes, M.G.A.; Fonseca, E.M.M.; Natal, Renato; Dias, Maria Isabel Ribeiro; Lopes, Ana Catarina Oliveira; Ribeiro, J.E.he thermal bone necrosis induced during a drilling process is a frequent and potential phenomenon, which contributes to post-operative problems. The frictional heat generated from the contact between the drill bit and the hole wall is unavoidable. However, understanding advanced techniques for acquiring reliable thermal data on bone drilling is important to ensure the quality of the drilled hole.
Ribeiro, J.E.
Fernandes, M.G.A.; Fonseca, E.M.M.; Natal, Renato; Dias, Maria Isabel Ribeiro; Lopes, Ana Catarina OliveiraThe thermal bone necrosis induced during a drilling process is a frequent and potential phenomenon, which contributes to post-operative problems. The frictional heat generated from the contact between the drill bit and the hole wall is unavoidable. However, understanding advanced techniques for acquiring reliable thermal data on bone drilling is important to ensure the quality of the drilled hole. The purpose o...
Temperature assessment in the drilling of composite materials and ex-vivo porci...
Fernandes, Maria; Fonseca, E.M.M.; Natal, Renato; Dias, Maria Isabel RibeiroThe bone cutting is a procedure widely used in medicine, including orthopaedic, dental and neuro surgeries. The success of this surgeries is dependent of many factors and also in temperature generation during the drilling bone. When an excessive heat is produced during the drilling bone the thermal necrosis can occur, and the bone suffers injuries.(...)
Composite materials and bovine cortical bone drilling: thermal experimental ana...
Fernandes, Maria; Fonseca, E.M.M.; Natal, Renato; Vaz, M.A.P.; Dias, Maria Isabel RibeiroThe boné drilling is a common procedure in orthopaedic surgery, mainly in the treatment of fractures and reconstmctive surgery. The success of this surgeries is dependent of many factors and also in heat generation control during the drilling boné. The main concem in boné drilling are the mechanical and thermal damage of the boné induced by inappropriate parameters such as drill speed and feed-rate during surgi...