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Publications
Publications (39)
Pseudoexfoliation, one of the most frequent crystalline lens complex disorders, is prevalent in up to 30% of individuals older than 60 years old. This disease can lead to severe conditions, such as subluxation or dislocation of the lens, due to the weakening of the zonules. The goal for the present study was to understand the relevant biomechanical...
This study aimed to determine the temporal parameters in the rotational shot-put phases and the shot-put release conditions in elite athletes. To analyze your correlation with the result and to analyze the differences between the male and female athletes. Eight elite ath-letes were analyzed. The 3D kinematic analysis was applied, through two high-s...
Bone Tissue Engineering has been focusing on improving the current methods for bone repair, being the use of scaffolds presented as an upgrade to traditional surgery techniques. Scaffolds are artificially porous matrices, meant to promote cell seeding and proliferation, being these properties influenced by the permeability of the structure. This wo...
Computed tomography (CT) and X-ray images have been extensively used as a valuable diagnostic tool in dentistry for surgical planning and treatment. Nowadays, dental cone beam CT has been extensively used in dental clinics. Therefore, it is possible to employ three-dimensional (3D) data from the CT to reconstruct a two-dimensional (2D) panoramic de...
This book contains the abstracts of all the keynotes and commnunications presented at the First International Conference on the Progress in Digital and Physical Manufacturing, held in the School of Technology and Management, from the 2nd to 4th October' 2019.
Additive manufacturing (AM) applied to the orthopaedic and surgical domains provided access to newer solutions for customised implants, customised scaffolds or even organ printing. These solutions are based on imagological data, gathered from CT-scans and/or MRI-scans. The compromise between patient’s radiation exposition and resolution along the f...
This work is intended to characterize the mechanical behavior of hybrid carbon–glass composite plates under combined loading of bending and torsion, and to determine the optimal ply fiber orientations to minimize the maximum out-of-plane displacement under such loading conditions. Hybrid composite plates were manufactured with 10 plies each and dif...
The combination of computational methods with 3D printing allows for the control of scaffolds microstructure. Lately, triply periodic minimal surfaces (TPMS) have been used to design porosity-controlled scaffolds for bone tissue engineering (TE). The goal of this work was to assess the mechanical properties of TPMS Gyroid structures with two porosi...
Mesh quality is essential to have a good and faster plastics injection computational analysis as well as reliable results. Additionally, a hexahedral mesh presents several numerical advantages over tetrahe-dral ones. However, hexahedral mesh generation is a complex and time demanding issue in finite volume method, so normally commercial software do...
The automated extraction of anatomical reference landmarks in the femoral volume may improve speed, precision and accuracy of surgical procedures, such as total hip arthroplasty. These landmarks are often hard to achieve, even via surgical incision. In addition, it provides a presurgical guidance for prosthesis sizing and placement. This study pres...
There are several commercial software for medical image dataset segmentation. However, most of them are expensive and not user-friendly. With our proposal of a new opensource software with a simple and specific graphical user interface (GUI), it is easy to segment a foetus from a 3D ultrasound medical image dataset. The segmented portion of images...
Femur segmentation can be an important tool in orthopedic surgical planning. However, in order to overcome the need of an experienced user with extensive knowledge on the techniques, segmentation should be fully automatic. In this paper a new fully automatic femur segmentation method for CT images is presented. This method is also able to define au...
Hot Runners mesh quality is essential for a good and faster plastics injection computational analysis. Addi-tionally, a hexahedral mesh presents several numerical advantages over tetrahedral ones. However, mesh generation of hexahedral meshes is a very complex and time demanding issue in finite element analysis, so normally commercial software do n...
Tissue engineering represents a new field aiming at developing biological substitutes to restore, maintain, or improve tissue functions. In this approach, scaffolds provide a temporary mechanical and vascular support for tissue regeneration while tissue in-growth is being formed. The design of optimized scaffolds for tissue engineering is a key top...
Computed Tomography (CT) is, in several cases, important in dental diagnosis. In fact, the panoramic reconstruction is commonly used in order to have a longitudinal view of the dental arch. Nowadays, dental CT equipments emit lower-dose radiation compared with other CT machines. Thus, dental CT became popular. However, there are some equipments tha...
Mandibular symphysis plates, used to heal fractures, can be made from different materials, normally titanium or CoCr alloys. In this work these two materials are tested and compared in order to study the plate's performance in fracture stabilization. This is a computational work performed with the advice of Brazilian maxoillofacial surgeons.
RESUMO: O objetivo deste estudo consistiu na análise cinemática da técnica de salto em altura, onde se pretendeu obter o padrão da técnica Fosbury Flop. Este tipo de análise é importante para estudar e otimizar a performance dos atletas. A amostra selecionada baseou-se em quatro atletas, que participam regularmente nas competições nacionais. Para e...
The success of a total hip arthroplasty is strongly related to the initial stability of the femoral component and to the stress shielding effect. In fact, for cementless stems, initial stability is essential to promote bone ingrowth into the stem coating. An inefficient primary stability is also a cause of thigh pain. In addition, the bone adaptati...
IntroductionOptimization Methods for Implant DesignDesign Requirements for a Cementless Hip StemMulticriteria Formulation for Hip Stem DesignComputational ModelOptimal Geometries AnalysisLong-Term Performance of Optimized ImplantsConcluding RemarksReferences
The work presented in this paper was developed with the objective of increasing road safety for motorcycle drivers. Guardrails are traffic barriers placed along the roadsides to protect vehicles from hazards behind the barriers. These guardrails are constructed using standard steel W-beam mounted on spaced posts. When accidents involving motorcycle...
A multicriteria optimization model is developed to obtain the optimal geometry of the femoral component of a hip prosthesis.
The objective function minimizes both the relative tangential displacement and the contact normal stress. For cementless stems,
these two factors are relevant for the prosthesis stability and therefore for the implant success...
A computational model to obtain optimized geometries for the femoral component of hip prosthesis is presented. Using structural optimization techniques, the objective is to determine the shape of uncemented stems that maximize initial stability and improve performance. To accomplish this, the optimization problem is formulated by the minimization o...
Just after a Total Hip Arthrosplasty, the fixation of the cementless stem mainly depends on mechanical factors. If a good
initial mechanical stability is achieved, new bone growths into the stem porous coating, leading to a desirable long-term
biologic fixation. On the other hand, an inefficient primary stability could be painful for the patient an...
The primary stem stability is an essential factor for success of cementless hip stems. A correct choice of the stem geometry can improve the stem stability and, consequently, increase the life time of a hip implant. In this work, it is proposed a computational model for shape optimization of cementless hip stems. The optimization problem is formula...
This work presents a development of a computational model for shape optimization of cementless hip stems. To improve the stability of the prosthesis, the optimization problem consists of the minimization of the relative displacements on bone/stem interface. The design variables are parameters that characterize the geometry of selected cross section...
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Projects (4)
The Organizing Committee would like to welcome you to Leiria for the first International Conference on Progress in Digital and Physical Manufacturing (ProDPM'19), organized by the School of Technology and Management (ESTG) of the Polytechnic Institute of Leiria (IPL). This international event aims at providing a major international forum for the scientific exchange of multi-disciplinary and inter-organisational aspects performed by academics, researchers and industrial partners in order to exchange ideas in the field of digital and physical manufacturing and related areas. The conference expects to foster networking and collaboration among participants to advance the knowledge and identify major trends in the field. ProDPM'19 aims at making a significant contribution for further development of these fields.
For more information, please visit: http://www.prodpm.ipleiria.pt
Additive Manufacturing (AM) is defined as “a process of joining materials to make objects from 3D model data, usually layer upon layer, as opposed to subtractive manufacturing technologies. AM means greater flexibility in design and customization, less scrap, and shorter production cycles and allows: focus-on-design, multi material integration, complex electromechanical and MEMS system with embedded electronics, customized parts and systems (e.g. for biomedical implants) and resource efficiency. AM is considered as the third Industrial Revolution after the automation of textile industry and assembly lines. It has the potential to meet the future needs for resource efficiency, efficient manufacturing systems, material integration, new manufacturing processes – providing world beating platforms for new, agile, more cost-effective manufacturing processes and new business models. AM impacts almost all of Portuguese strategic emerging industries (e.g. advanced equipment manufacturing, mould Industry, information technology biomedicine). PAMI intends to respond to a crucial competitiveness challenge and threat to future property: closing the gap between R&D activities and the development of technological innovations in production of goods. PAMI is also in-line with the CRER2020 program for the central region of Portugal. All nodes of PAMI will follow he following general aims: (1) Fostering novel research areas and interdisciplinary fields, (2) To encourage, support and help in creation of products and launch of spin off companies from the current research institutes in fields of engineering, and medical sciences, (3) to provide educational services and prepare the new generation of engineers and (4) to provide prototyping services to external companies/ Institutes. PAMI proposes a clever distribution of excellent infrastructures within central region of Portugal with different areas of specialty: Mechanical, Materials, and Electrical Engineering, and Bio-Science. CDRSP-IPLeiria: Network Leader, fundamental research and development of novel techniques for AM. CEMMPRE – UC: production of new materials and characterization of raw materials and final components: ISR/CNC-UC: support research activities in mobile robots, medical robots, flexible electronics, soft robots, bio-compatible and active medical prosthesis, and selected areas of MEMS among others. IPN: Creation and support of spin offs. In addition to the scientific impacts as described above, PAMI will have different Impacts: educational (we estimate 1000 visitants per year from several universities and companies), economic (fostering new spin offs from research institutes, encouraging product development spirit in universities) and social (considering the ambitious research objectives of the consortium related to medical applications).
PAMI is a Research Infrastructure of the National Roadmap of Research Infrastructures of Strategic Relevance for 2014-2020, co-funded by the Portuguese Foundation for Science and Technology (FCT) and European Union through the Centro2020 and Portugal2020. Partners: Centre for Rapid and Sustainable Product Development of the Polytechnic Institute of Leiria (CDRSP-IPLeiria); Technological Centre for Mouldmaking, Special Tooling and Plastic Industries (CENTIMFE); Centre for Mechanical Engineering, Materials and Processes, University of Coimbra (CEMMPRE); Institute of Systems and Robotics - University of Coimbra (ISR-UC); The Centre for Neuroscience and Cell Biology (CNC - UC); Instituto Pedro Nunes (IPN).
