Percorrer por autor "Manzanares, Cristina"
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- Effect of drill speed during drilling of human cadaveric tibiaePublication . Fernandes, M.G.A.; Fonseca, E.M.M.; Natal, Renato; Manzanares, Cristina; Azevedo, Lucas D.Boné fracture is a feature ofeveryday life. Most of the treatments involve boné drilling to fixation of implanted medicai devices. Boné loss due to excessive produced heat during drilling may weaken lhe purchase of surgically placed scre-ws and pins, causing them to loosen postoperatively. Decrease the heat generation hás a great demand as it helps in better fixation and healing of boné tissue. This paper presents an experimental model to study the effect of drill speed using human cadaveric tibiae.
- Effect of drill speed during drilling of human cadaveric tibiaePublication . Fernandes, M.G.A.; Fonseca, E.M.M.; Natal, Renato; Manzanares, Cristina; Azevedo, Lucas D.Bone fracture is a feature of everyday life. Most of the treatments involve bone drilling to fixation of implanted medical devices. Bone loss due to excessive produced heat during drilling may weaken the purchase of surgically placed screws and pins, causing them to loosen postoperatively. Decrease the heat generation has a great demand as it helps in better fixation and healing of bone tissue. This paper presents an experimental model to study the effect of drill speed using human cadaveric tibiae. The results revealed that the temperature rise and the duration of temperature elevation decreased when lower drill speeds are used.
- Effect of drill speed on the strain distribution during drilling of bovine and human bonesPublication . 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 level of strain generated in the bone during the drilling process. This paper focuses on the analysis of different drill speeds during drilling of fresh bovine femora and human cadaveric tibiae. The main contribution of this work is to determine how differences in applied drill speeds affect the strain of cortical tissue near the drilling site and the drill bit temperature.
- Strain analysis in the drilling of human and bovine bonePublication . 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 and the strain distribution during drilling. The challenge diiring drilling should not be Umited to avoid thermal damage but also to predict the strains qffècting the boné, since the cutting force and lhe accuracy of the osíeotomy depends upon the sin-geon 's manual skills.
- Stress analysis during drilling of human cadaveric tibiaePublication . Fernandes, M.G.A.; Azevedo, Lucas D.; Fonseca, E.M.M.; Natal, Renato; Manzanares, CristinaSignificant researches exist to estimate and to contrai lhe boné drilling temperatures, hawever no published data exist regarding lhe sïress analysis during the boné drilling, mainly in the case ofhuman bonés. The inherent difficulties to thisprocess and to collect human bonés lead to a lack of information about this subject. The present study investigates the influence ofdrill speed on the stresses generation ofhuman cadaveric tibiae. An experimental approach of boné drilling hás been conducted using linear strain gauges atflat surfaces of boné tissue. It was concluded when the drill speed is lo-wer, the levei ofstresses in the human cadaveric tibiae are lower.
- Stress analysis during drilling of human cadaveric tibiaePublication . Fernandes, M.G.A.; Azevedo, Lucas D.; Fonseca, E.M.M.; Natal, Renato; Manzanares, CristinaO profissional de saúde tem ao seu dispor diferentes ofertas no que diz respeito à prótese do joelho, variando essencialmente a geometria e o material. Neste trabalho, utilizaram-se tomografias computorizadas de pacientes, que permitiram desenvolver modelos ósseos, para posterior inserção da prótese de joelho. Três geometrias de próteses diferentes, inseridas no modelo ósseo, vão possibilitar ter conhecimento da influência do material no desempenho do conjunto. Modelos computacionais 2D e 3D, submetidos à compressão, vão permitir eleger a melhor conjugação entre geometria e material.
- The temperature in the drilling of ex-vivo bovine femurs and human cadaveric tibiaePublication . Fernandes, M.G.A.; Azevedo, Lucas D.; Fonseca, E.M.M.; Natal, Renato; Manzanares, CristinaIn an ageing society it’s inevitable that the bone fractures occur with increasing frequency. Usually, the fracture treatment involves bone drilling for screw insertion to fix the fractured parts for immobilization. However, high rotational speeds may cause a high rise in bone temperature. It is generally agreed that temperatures above 55°C for a period longer than 30 seconds are deleterious to the bone tissue and leads to the irreversible death of cells. Decrease the heat generation has a great demand as it helps in better fixation and healing of bone tissue.
- The temperature in the drilling of ex-vivo bovine femurs and human cadaveric tibiaePublication . Fernandes, M.G.A.; Azevedo, Lucas D.; Fonseca, E.M.M.; Natal, Renato; Manzanares, CristinaThe bone drilling is common in orthopaedic surgery. The success of this surgery is dependent on many factors, namely on the heat generation control during the bone drilling. The main concern in bone drilling is the mechanical and thermal damage induced by inappropriate parameters, as drill speed and feed-rate.