Academic literature on the topic 'Prosthesis Computer-aided design'
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Journal articles on the topic "Prosthesis Computer-aided design"
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Zavanelli, Adriana Cristina, José Vitor Quinelli Mazaro, Caroline Cantieri de Mello, Joel Ferreira Santiago, and Andressa Paschoal Amoroso. "An Esthetics Rehabilitation with Computer-aided Design/ Computer-aided Manufacturing Technology." Journal of Contemporary Dental Practice 15, no. 4 (2014): 506–12. http://dx.doi.org/10.5005/jp-journals-10024-1570.
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ABSTRACT Aim This paper describes a case of a rehabilitation involving Computer Aided Design/Computer Aided Manufacturing (CADCAM) system in implant supported and dental supported prostheses using zirconia as framework. Background The CAD-CAM technology has developed considerably over last few years, becoming a reality in dental practice. Among the widely used systems are the systems based on zirconia which demonstrate important physical and mechanical properties of high strength, adequate fracture toughness, biocompatibility and esthetics, and are indicated for unitary prosthetic restorations and posterior and anterior framework. Case description All the modeling was performed by using CAD-CAM system and prostheses were cemented using resin cement best suited for each situation. Conclusion The rehabilitation of the maxillary arch using zirconia framework demonstrated satisfactory esthetic and functional results after a 12-month control and revealed no biological and technical complications. Clinical significance This article shows the important of use technology CAD/CAM in the manufacture of dental prosthesis and implant-supported. How to cite this article Mazaro JVQ, Mello CC, Zavanelli AC, Santiago JF Jr, Amoroso AP, Pellizzer EP. An Esthetics Rehabilitation with Computer-aided Design/Computer-aided Manufacturing Technology. J Contemp Dent Pract 2014;15(4): 506-512.
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Colombo, Giorgio, Giancarlo Facoetti, and Caterina Rizzi. "A digital patient for computer-aided prosthesis design." Interface Focus 3, no. 2 (April 6, 2013): 20120082. http://dx.doi.org/10.1098/rsfs.2012.0082.
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This article concerns the design of lower limb prosthesis, both below and above knee. It describes a new computer-based design framework and a digital model of the patient around which the prosthesis is designed and tested in a completely virtual environment. The virtual model of the patient is the backbone of the whole system, and it is based on a biomechanical general-purpose model customized with the patient's characteristics (e.g. anthropometric measures). The software platform adopts computer-aided and knowledge-guided approaches with the goal of replacing the current development process, mainly hand made, with a virtual one. It provides the prosthetics with a set of tools to design, configure and test the prosthesis and comprehends two main environments: the prosthesis modelling laboratory and the virtual testing laboratory. The first permits the three-dimensional model of the prosthesis to be configured and generated, while the second allows the prosthetics to virtually set up the artificial leg and simulate the patient's postures and movements, validating its functionality and configuration. General architecture and modelling/simulation tools for the platform are described as well as main aspects and results of the experimentation.
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Anitua, Eduardo, Carlos Flores, Laura Piñas, and Mohammad Hamdan Alkhraisat. "Frequency of Technical Complications in Fixed Implant Prosthesis: The Effect of Prosthesis Screw Emergence Correction by Computer-Aided Design/Computer-Aided Manufacturing." Journal of Oral Implantology 44, no. 6 (December 1, 2018): 427–31. http://dx.doi.org/10.1563/aaid-joi-d-17-00229.
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Computer-aided design/computer-aided manufacturing (CAD-CAM) technology permits the angular correction of screw emergence into the prosthesis; however, there is lack of controlled clinical studies that assess the frequency of technical complications in angled screw channel restorations. This controlled clinical study was designed to assess technical incidences in angled screw channel restorations. Patients who underwent placement of implant prosthesis between November 2014 and December 2015 were screened. The patients were selected if they received a prosthesis with up to 30° correction of the prosthesis screw emergence and had at least 1 nonangulated prosthesis (screw retained). All prostheses were located completely/partially in the posterior region. The frequency of technical complications was the principal variable. A total of 52 patients with a mean age of 62 ± 10 years participated, with a total of 110 prostheses (55 in the test group and 55 in the control group). A total of 11 technical complications occurred (7 in the test group and 4 in the control group). These differences were not statistically significant. All prostheses in both groups survived the follow-up. The correction of the screw emergence into the prosthesis has not increased the risk of technical complications in CAD-CAM implant prostheses.
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Mai, Hai Yen, Jae-Min Seo, Jae-Kwang Jung, and Du-Hyeong Lee. "Strategic Use of CAD-CAM Interim Restoration for the Recovery of the Vertical Dimension of Occlusion in the Posterior Partially Edentulous Jaw." Applied Sciences 10, no. 21 (October 31, 2020): 7735. http://dx.doi.org/10.3390/app10217735.
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Occlusal contact loss occasionally occurs following the placement of implant-supported fixed dental prostheses in the posterior region. This complication is caused by the change in the vertical dimension of occlusion after the recovery of mastication. The change is probably related to the prosthesis sinking phenomenon and previous mandibular dislocation. The use of interim prostheses could help re-establish the vertical dimension of occlusion. The definitive prostheses can then be accurately fabricated using digital techniques in the newly established vertical dimension. In this case report, we introduce a protocol incorporating a computer-aided design and computer-aided manufacturing (CAD-CAM) interim prosthesis and digital techniques to minimize the occurrence of unexpected initial occlusal changes in the prosthetic treatment of implant-supported prostheses in the posterior region.
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Li, Dong Song, Shu Qiang Li, Bo Cai, Wei Feng, and Jian Guo Liu. "Computer-Aided Design and Simulated-Mechanical Study of Individualized Femoral Prosthesis." Applied Mechanics and Materials 152-154 (January 2012): 1347–52. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.1347.
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Objective To construct three-dimensional models of individualized femoral prosthesis by using computer-aided design and to verify whether individualized femoral prosthesis is superior to popular femoral prosthesis via simulating and contrasting mechanical study. Methods Two-dimensional images of fresh femurs were obtained by using total-length CT scanning and processed with computer edge recognition and three-dimensional contour extraction software to identify outer and inner contour of pulp cavity, extract contour data of pulp cavity and prosthesis, and construct three-dimensional models of femur and individualized femoral prosthesis. SolidWorks software was used to establish three-dimensional prosthetic models in common biological and bone cement types; moreover, bone-cement, biological, and individualized femoral prosthesis were replaced via simulating clinical surgery. Results Edge extracting was replaced by Canny operator, characterizing by stable running, credible outcome, and consistent with the primary request. Stress, femoral stress, interface stress, and primary micro-motion of individualized femoral prosthesis were significantly lower than biological and bone-cement femoral prosthesis (P Conclusion The computer-aided design is reliable to perform the assistant design of prosthesis; furthermore, biomechanical properties of the individualized femoral prosthesis are superior to those of popular femoral prosthesis.
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Ventura Ferreira, Nuno, Nuno Leal, Inês Correia Sá, Ana Reis, and Marisa Marques. "Método Assistido por Computador e Prototipagem Rápida para o Fabrico Personalizado de uma Prótese de Dedo em Banda de Silicone." Acta Médica Portuguesa 27, no. 6 (December 30, 2014): 775. http://dx.doi.org/10.20344/amp.5308.
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The fabrication of digital prostheses has acquired growing importance not only for the possibility for the patient to overcome psychosocial trauma but also to promote grip functionality. An application method of three dimensional-computer-aided design technologies for the production of passive prostheses is presented by means of a fifth finger amputee clinical case following bilateral hand replantation.<br />Three-dimensional-computerized tomography was used for the collection of anthropometric images of the hands. Computer-aided design techniques were used to develop the digital file-based prosthesis from the reconstruction images by inversion and superimposing the contra-lateral finger images. The rapid prototyping manufacturing method was used for the production of a silicone bandage prosthesis prototype. This approach replaces the traditional manual method by a virtual method that is basis for the optimization of a high speed, accurate and innovative process.<br /><strong>Keywords:</strong> Reconstructive Surgical Procedures; Fingers; Computer-Aided Design; Prostheses and Implants; Silicones.
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Shah, Mayank. "RETRACTED: Auricular prosthesis fabrication using computer-aided design and rapid prototyping technologies." Prosthetics and Orthotics International 40, no. 3 (October 8, 2013): NP1. http://dx.doi.org/10.1177/0309364613504779.
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At the request of the editor Mayank Shah ‘Auricular prosthesis fabrication using computer-aided design and rapid prototyping technologies’ Prosthetics and Orthotics International, published online before print on October 8, 2013 as doi:10.1177/0309364613504779 has been retracted. This is because it contains unattributed overlap with K. Subburaj, C. Nair, S. Rajesh, S. M. Meshram, B. Ravi ‘Rapid development of auricular prosthesis using CAD and rapid prototyping technologies’ International Journal of Oral & Maxillofacial Surgery 2007; 36: 938–943 doi:10.1016/j.ijom.2007.07.013
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van der Stelt, Merel, Luc Verhamme, Cornelis H. Slump, Lars Brouwers, and Thomas JJ Maal. "Strength testing of low-cost 3D-printed transtibial prosthetic socket." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 236, no. 3 (December 1, 2021): 367–75. http://dx.doi.org/10.1177/09544119211060092.
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Measurement and production of traditional prosthetic sockets are time-consuming, labor-intensive, and highly dependent on the personnel involved. An alternative way to make prostheses is using computer-aided design (CAD) and computer-aided manufacturing (CAM). Fused Filament Fabrication (FFF) may be an alternative to make low-cost prosthetic sockets. This study investigates the tensile properties of potential printing materials suitable for FFF according to ISO527 (Standard Test Method for Tensile Properties of Plastics). To ensure that FFF-printed sockets are safe for patient usage, the structural integrity of the 3D-printed prosthesis will be investigated according to ISO10328 (International Standard Structural Testing of Lower Limb Prostheses). Tough PLA was the most suitable print material according to ISO 527 testing. The Tough PLA printed socket completed 2.27 million cycles and a static test target value of 4025 N. Future research remains necessary to continue testing new potential materials, improve print settings, and improve the socket design for the production of FFF-printed transtibial prosthetic sockets. FFF using Tough PLA can be used to create transtibial prostheses that almost comply with the International Standard for Structural Testing of Lower Limb Prostheses.
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Murayama, Takeshi, Kosei Oono, Mitsunori Tada, Toru Eguchi, Misuzu Nagami, and Mitsuhiro Tamamoto. "Computer-Aided Design and Fabrication of Finger Prosthesis." Journal of Biomedical Science and Engineering 08, no. 02 (2015): 98–103. http://dx.doi.org/10.4236/jbise.2015.82010.
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Cristache, Corina Marilena, Ioana Tudor, Liliana Moraru, Gheorghe Cristache, Alessandro Lanza, and Mihai Burlibasa. "Digital Workflow in Maxillofacial Prosthodontics—An Update on Defect Data Acquisition, Editing and Design Using Open-Source and Commercial Available Software." Applied Sciences 11, no. 3 (January 21, 2021): 973. http://dx.doi.org/10.3390/app11030973.
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Background: A maxillofacial prosthesis, an alternative to surgery for the rehabilitation of patients with facial disabilities (congenital or acquired due to malignant disease or trauma), are meant to replace parts of the face or missing areas of bone and soft tissue and restore oral functions such as swallowing, speech and chewing, with the main goal being to improve the quality of life of the patients. The conventional procedures for maxillofacial prosthesis manufacturing involve several complex steps, are very traumatic for the patient and rely on the skills of the maxillofacial team. Computer-aided design and computer-aided manufacturing have opened a new approach to the fabrication of maxillofacial prostheses. Our review aimed to perform an update on the digital design of a maxillofacial prosthesis, emphasizing the available methods of data acquisition for the extraoral, intraoral and complex defects in the maxillofacial region and assessing the software used for data processing and part design. Methods: A search in the PubMed and Scopus databases was done using the predefined MeSH terms. Results: Partially and complete digital workflows were successfully applied for extraoral and intraoral prosthesis manufacturing. Conclusions: To date, the software and interface used to process and design maxillofacial prostheses are expensive, not typical for this purpose and accessible only to very skilled dental professionals or to computer-aided design (CAD) engineers. As the demand for a digital approach to maxillofacial rehabilitation increases, more support from the software designer or manufacturer will be necessary to create user-friendly and accessible modules similar to those used in dental laboratories.
Dissertations / Theses on the topic "Prosthesis Computer-aided design"
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Ballit, Abbass. "Design and manufacturing process optimization for prosthesis of the lower limb." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2589.
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Le socket prothétique (dit aussi emboiture prothétique), élément d'interface essentiel entre le moignon du patient et le dispositif prothétique, est le plus souvent le lieu où se définit le degré de réussite prothétique. C'est la partie la plus critique de la prothèse, personnalisée pour s'adapter au membre résiduel unique de l'amputé. Sans une forme et un ajustement approprié du socket, la prothèse devient inconfortable, voire inutilisable, et provoque des douleurs et des problèmes de peau. La production prothétique actuelle manque encore de normes numériques universelles pour concevoir un socket. La pratique actuelle est coûteuse et repose sur les raffinements manuels du technicien orthopédiste, et la qualité de l'ajustement est strictement corrélée à ses compétences ainsi qu'aux retours subjectifs du patient lors des phases d’essai de la prothèse fabriquée. La thèse vise à mener une analyse approfondie d'une conception optimale de l'emboîture prothétique en étudiant un processus alternatif de conception assistée par ordinateur. Ce processus est entièrement basé sur le modèle virtuel du membre résiduel du patient et repose sur le calcul de l’interaction emboîture-moignon. Un calcul rapide est favorable dans ce cas, c'est pourquoi nous proposons d'utiliser le système Mass-Spring (MSS) au lieu de la méthode FE largement utilisée pour modéliser les tissus mous du membre résiduel. Une nouvelle configuration du modèle MSS est proposée pour respecter la propriété de non compressibilité des tissus mous en ajoutant des « ressorts correctifs » non linéaires. Le modèle numérique doit être généré à partir du modèle scanné du moignon. À cette fin, nous proposons un schéma de fusion de quatre capteurs de profondeur à bas coût pour un scan rapide et économique avec des techniques de réduction des erreurs. Enfin, le membre résiduel virtuel est utilisé dans la phase de conception du socket. Une méthode de conception paramétrique est proposée et étudiée. Le problème de conception est transformé en problème de satisfaction des contraintes dérivées du calcul inverse de l'interaction socket-moignon. L'approche inverse a été choisie pour éliminer le besoin d'une formulation de contact coûteuse. Ce fait conduit à des calculs rapides, et par conséquent, permet de fournir des retours numériques en temps réel pendant le processus de conception. Le système a été implémenté pas programmation C++ avec une interface graphique où les retours numériques sont donnés sous forme d’une carte de radar. La validation a été faite en comparant les résultats de notre système avec la sortie des simulations FE. Le système a été implémenté avec une interface graphique conviviale et virtuellement testé et validé numériquement. Ce système réduit les limites des pratiques actuelles. Cependant, de nombreux travaux sont encore en cours pour affiner et développer le système et le valider par des expériences cliniquesThe prosthetic socket, an essential interface element between the patient's stump and prosthetic device, is most often the place where the degree of prosthetic success is defined. It is the most critical part of the prosthesis, customized to fit with the unique residual limb of the amputee. Without a proper socket shape and fit, the prosthesis becomes uncomfortable, or even unusable, and causes pain and skin issues. The state-of-the-art prosthetic production is still missing universal numerical standards to design a socket. The current practice is expensive and relies on the manual refinements of the orthopedic technician, and the fit quality strictly correlates with his skills as well as the subjective feedback of the patient. The thesis aims to conduct a deep analysis of an optimal design of the prosthetic socket by studying and developing an alternative computer-aided design process. This process is fully based on the virtual model of the patient’s residual limb and relies on the calculation of the socket-stump interaction. A fast calculation is favorable in this case, that’s why we propose to use the Mass-Spring System (MSS) instead of the widely used FE method to model the soft tissues of the residual limb. A new configuration of the MSS model is proposed to respect the non-compressibility property of the soft tissues by adding non-linear “Corrective Springs”. The numeric model is to be generated from the scanned model of the stump. For this purpose, we propose a fusion scheme of four RGB-Depth sensors for a rapid and low-cost scan with error reduction techniques. Finally, the virtual residual limb is used in the socket designing phase. A parametric design method is proposed and investigated. The design problem is transformed into a constraint-satisfaction-problem whose constraints are derived from the inverse calculation of the stump-socket interaction. The inverse approach has been chosen to eliminate the need for expensive contact formulation. This fact leads to rapid calculations, and consequently, allows to provide real-time numerical feedback during the designing process. The validation was done by comparing the results of our system with the output of FE simulations. The system has been implemented with a user-friendly graphical interface and virtually tested and numerically validated. This system reduces the limitations of the current practices. However, a lot of works is still ahead to refine and develop the system and validate it with clinical experiments
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Reynolds, David. "The computer aided design of below-knee prosthetic sockets." Thesis, University College London (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309971.
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Bodkin, Troy L. "Specifying a hybrid, multiple material CAD system for next-generation prosthetic design." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/25595.
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For many years, the biggest issue that causes discomfort and hygiene issues for patients with lower limb amputations have been the interface between body and prosthetic, the socket. Often made of an inflexible, solid polymer that does not allow the residual limb to breathe or perspire and with no consideration for the changes in size and shape of the human body caused by changes in temperature or environment, inflammation, irritation and discomfort often cause reduced usage or outright rejection of the prosthetic by the patient in their day to day lives. To address these issues and move towards a future of improved quality of life for patients who suffer amputations, Loughborough University formed the Next Generation Prosthetics research cluster. This work is one of four multidisciplinary research studies conducted by members of this research cluster, focusing on the area of Computer Aided Design (CAD) for improving the interface with Additive Manufacture (AM) to solve some of the challenges presented with improving prosthetic socket design, with an aim to improve and streamline the process to enable the involvement of clinicians and patients in the design process. The research presented in this thesis is based on three primary studies. The first study involved the conception of a CAD criteria, deciding what features are needed to represent the various properties the future socket outlined by the research cluster needs. These criteria were then used for testing three CAD systems, one each from the Parametric, Non Uniform Rational Basis Spline (NURBS) and Polygon archetypes respectively. The result of these tests led to the creation of a hybrid control workflow, used as the basis for finding improvements. The second study explored emerging CAD solutions, various new systems or plug-ins that had opportunities to improve the control model. These solutions were tested individually in areas where they could improve the workflow, and the successful solutions were added to the hybrid workflow to improve and reduce the workflow further. The final study involved taking the knowledge gained from the literature and the first two studies in order to theorise how an ideal CAD system for producing future prosthetic sockets would work, with considerations for user interface issues as well as background CAD applications. The third study was then used to inform the final deliverable of this research, a software design specification that defines how the system would work. This specification was written as a challenge to the CAD community, hoping to inform and aid future advancements in CAD software. As a final stage of research validation, a number of members of the CAD community were contacted and interviewed about their feelings of the work produced and their feedback was taken in order to inform future research in this area.
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Freitas, Bruna Neves de. "Avaliação da adaptação marginal e interna de coroas de dissilicato de lítio confeccionadas pelo sistema CAD/CAM após escaneamento direto e indireto." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/58/58131/tde-31012018-153028/.
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O objetivo desse estudo foi avaliar a adaptação interna e marginal de coroas de dissilicato de lítio obtida por duas técnicas disponíveis pelo sistema CAD/CAM, o escaneamento direto e indireto. As análises foram realizadas por meio do microtomógrafo computadorizado (µCT), microscópio confocal a laser (CL) e técnica da replica (TR), em dois momentos: antes e após a cristalização do material. O dente 14 de manequim foi preparado e duplicado em silicone, obtendo 20 réplicas em resina de poliuretano. Para a formação do Grupo 1 (IND/n=08), o manequim foi moldado com moldeira de estoque e silicone de adição com técnica de moldagem simultânea e modelagem com gesso pedra tipo III e IV, totalizando oito modelos em gesso. Os modelos foram escaneados com escâner indireto. Foram fresadas oito coroas de dissilicato de lítio. Para formação do Grupo 2 (DIR/n=08), o manequim foi escaneado com escâner direto. Oito imagens foram obtidas e enviadas ao laboratório pelo programa do sistema. Da mesma forma, foram fresadas oito coroas de dissilicato de lítio. As leituras da adaptação marginal das coroas foram realizadas com as mesmas adaptadas sobre a respectiva réplica em poliuretano, no µCT, CL, e TR. As leituras da adaptação interna foram realizadas no µCT e TR. As análises foram realizadas antes e após a cristalização das coroas. Os dados que apresentaram distribuição normal foram analisados por ANOVA dois fatores e os dados que não apresentaram distribuição normal foram analisados por teste U de Mann-Whitey para comparação entre os Grupos e pelo teste de Wilcoxon para comparação antes e após a cristalização. Em relação à adaptação axial, foi verificada diferença significante apenas para os Tempos (p=0,017), com menores valores após a cristalização. Para a adaptação interna não foi observada diferença entre os Grupos (p>0,05) ou Tempos estudados (p>0,05). Para a adaptação marginal vertical houve diferença para o Grupo IND, com maiores valores após a cristalização independente da metodologia de análise (µCT - p=0,001; confocal - p=0,038). Já a medida marginal horizontal apresentou resultados divergentes de acordo com a metodologia utilizada. No µCT, IND foi maior que DIR (p=0,003) e antes maior que após a cristalização (p<0,001). No confocal, IND menor que DIR após a cristalização (p=0,05), e para DIR, antes menor que após a cristalização (p=0,005). No volume total e volume marginal do espaço para cimentação houve diferença significante apenas para o DIR, com maiores valores após a cristalização (volume total - p=0,025; volume marginal - p=0,002). Pelos resultados obtidos pode-se concluir que há contração do material após a cristalização, resultando em maior desadaptação comprovado pelo aumento do volume total do espaço de cimentação em consequência da dificuldade de assentamento da coroa de dissilicato de lítio.The objective of this study was to evaluate the internal and marginal adaptation of lithium desilicated crowns obtained by two alternative techniques to the CAD / CAM system, direct and indirect scanning. The analyzes were carried out by computerized microtomograph, laser confocal microscope and replica technique, in two moments: before and after the crystallization of the material. The manikin tooth 14 was prepared for total crown. Then it was duplicated, in silicone, and there were obtained 16 replicas in polyurethane resin. Two groups were formed from the impression of the manikin through the direct and indirect scanning, For the Group 1 (IND/n = 08), the manikin was molded with stock tray, with addition silicone, by the simultaneous molding technique and modeling performed with gypsum stone type III and IV, totaling eight molds and plaster models. The models were sent to the laboratory for scanning on the scanner indirect. Dissilicate crowns were made of lithium milled. For the Group 2 (DIR/n = 08), the dummy was scanned by scanner directly. The eight images obtained were sent directly to the laboratory by the system program. Likewise, milled lithium dissilicate crowns were made. The marginal adaptation of the crowns was performed with the same ones on the respective polyurethane tooth, in the computerized microtomograph (µCT), confocal laser microscope (CL) and through the replica technique (TR). Internal adaptation readings were performed using a µCT and TR. The analyses were made before and after the crystallization of the crowns. The data showed normal distribution were analyzed by two factors ANOVA and the data did not show normal distribution were analyzed for U Mann-Whitney test for comparison among groups and by the Wilcoxon test for comparison before and after the crystallization . In relation to the axial adaptation, significant difference was verified only for Times (p = 0.017), with lower values after crystallization. For the internal adaptation was not observed difference between groups (p > 0.05) or Times studied (p > 0.05). For the vertical marginal adaptation difference to the IND group, with higher values after the crystallization analysis methodology-independent (µCT p = 0.001;-p = 0.038 confocal). Already the measure presented divergent results horizontal marginal according to the methodology used. In µCT, IND was greater than DIR (p = 0.003) and greater than after the crystallization (p < 0.001). In confocal IND less than DIR after the crystallization (p = 0.05), and DIR, before less than after the crystallization (p = 0.005). In total volume and marginal volume of space for cementation significant difference only to the DIR, with higher values after the crystallization (total volume - p = 0.025; marginal volume - p = 0.002). The results obtained can be concluded that there is contraction of the material after the crystallization, resulting in higher leakage evidenced by the increase of the total volume of the cementing space as a result of the settling difficulty the dissilicate Crown.
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Ratsimbazafy, Jean-Raymond. "Fabrication assistee par ordinateur de protheses de hanche." Paris, ENSAM, 1988. http://www.theses.fr/1988ENAM0013.
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Methodologie du travail utilise. Resultats obtenus par l'application de la methode pour la modelisation de la forme exterieure d'un femur mesure par machine a mesurer tridimensionnelle. Comparaisons de la methode par rapport aux logiciels trouves sur le marche. Methodes de fabrication et gammes d'usinage de la prothese en fonction du materiel disponible. Creation d'un modele a partir de coupes scannographiques. Realisation d'un logiciel d'ecriture de programme-piece pour la fabrication assistee par ordinateur sur fraiseuse a commande numerique
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Cruz, Rena Louise Juan Resurreccion. "Advanced 3D biofabrication approaches for the treatment of microtia." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/213107/1/Rena_Cruz_Thesis.pdf.
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This thesis explored the application of advanced manufacturing technologies; 3D scanning, 3D modelling, 3D printing, and automated colour matching, in the fabrication of prosthetic options for children with microtia. The application of these technologies lowers cost, increase accessibility to patients, and reduces the skill required for technicians. These contributions involved developing a preliminary framework; developing a semi-automated parametric solution in which a high-quality complete ear model was deformed to match scan data from low-cost options; and developing methods of automated colour matching of silicone samples to participant skin tones with a low-cost spectrocolorimeter.
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Surapureddy, Rajesh. "Predicting Pressure Distribution Between Transfemoral Prosthetic Socket and Residual Limb Using Finite Element Analysis." UNF Digital Commons, 2014. http://digitalcommons.unf.edu/etd/551.
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In this study, a non-linear Finite Element (FE) model was created and analyzed to determine the pressure distribution between the residual limb and the prosthetic socket of a transfemoral amputee. This analysis was performed in an attempt to develop a process allowing healthcare providers and engineers to simulate the fit and comfort of transfemoral prosthetics to reduce the number of re-fittings needed for the amputees. The analysis considered the effects of interference due to insertion of the limb into the prosthesis, referred to as donning, and also the effects due to the body weight of the amputee. A non-linear finite element static implicit analysis method was utilized. This analysis implemented multiple finite element techniques, including geometric non-linearity due to large deflections, non-linear contacts due to friction between the contact surfaces of the residual limb and the socket, and non-linear hyper-elastic material properties for the residual limb’s soft tissue. This non-linear static analysis was carried out in two time-steps. The first step involved solving the interference fit analysis to study the pre-stresses developed due to the effect of donning. The donning process results in soft tissue displacement to accommodate the internal geometry of the prosthesis. In the second load application time-step, an additional load of half the person’s body weight was applied to the femur. The maximum normal stress (contact pressure) of 84 kPa was observed due to the combined effect of the donning procedure and body weight application, comparable to the studies performed by other researchers. The procedure developed through this work can be used by future researchers and prosthetic designers in understanding how to better design transfemoral prosthesis.
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Lapre, Andrew K. "Semi-Active Damping for an Intelligent Adaptive Ankle Prosthesis." 2012. https://scholarworks.umass.edu/theses/805.
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Modern lower limb prostheses are devices that replace missing limbs, making it possible for lower limb amputees to walk again. Most commercially available prosthetic limbs lack intelligence and passive adaptive capabilities, and none available can adapt on a step by step basis. Often, amputees experience a loss of terrain adaptability as well as stability, leaving the amputee with a severely altered gait. This work is focused on the development of a semi-active damping system for use in intelligent terrain adaptive ankle prostheses. The system designed consists of an optimized hydraulic cylinder with an electronic servo valve which throttles the hydraulic fluid flowing between the cylinder’s chambers, acting on the prosthesis joint with a moment arm in series with a carbon spring foot. This provides the capability to absorb energy during the amputees gait cycle in a controlled manner, effectively allowing the passive dynamic response to be greatly altered continuously by leveraging a small energy source. A virtual simulation of an amputee gait cycle with the adaptive semi-active ankle design revealed the potential to replicate adaptive abilities of the human ankle. The results showed very similarly that irregularities in amputee biomechanics can be greatly compensated for using semi-active damping.
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Khouja, Naseeba 1981. "Bone regeneration in novel porous titanium implants." Thesis, 2010. http://hdl.handle.net/1805/2224.
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Indiana University-Purdue University Indianapolis (IUPUI)The objective of this study was to evaluate the in vivo performance of the novel press-fit dental implant fabricated via electron beam melting (EBM, Southern Methodist Univ.) and compare it to a commercially-available porous-coated press-fit dental implant (Endopore, Innova Corp.). Twelve cylindrical shaped implants 3 mm in diameter x 5 mm long were made by EBM (Southern Methodist Univ.) using Ti6Al4V ELI alloy. Twelve commercial implants (Endopore, Innova Corp.) of the same geometry were used as controls. Samples were implanted in rabbit tibia and retrieved six weeks postoperatively. Six specimens from each implant type were embedded undecalcified, sectioned, and stained with toluidine blue (Sigma) for histomorphometry analysis. Bone-to-implant contact (BIC) was measured. On the six remaining samples from each implant type, the mechanical properties were evaluated by pushout test on a material testing machine. The samples were loaded at a loading rate of 1 mm/min. The pushout strength was measured and the apparent shear stiffness was calculated. The results were analyzed with a paired-t test. The histology shows osteointegration of surrounding bone with both implant types. Bone was found to grow into the porous space between the beads. Both the Endopore (Innova Corp.) and the EBM (Southern Methodist Univ.) showed similar BIC. The mean BIC for the Endopore (Innova Corp.) and EBM (Southern Methodist Univ.) implant were 35 ± 6% and 32 ± 9%, respectively. It failed to reach statistical significance (p > 0.05). The peak pushout force for Endopore (Innova Corp.) and EBM (Southern Methodist Univ.) implants were 198.80 ± 61.29 N and 243.21 ± 69.75 N, respectively. The apparent shear stiffness between bone and implant for the Endopore (Innova Corp.) and EBM (Southern Methodist Univ.) implants were 577.36 ± 129.99 N/mm; and 584.48 ± 146.63 N/mm, respectively. Neither the peak pushout force nor the apparent shear stiffness of the implants was statistically different between the two groups (p > 0.05). The results suggest that the implants manufactured by EBM (Southern Methodist Univ.) perform equally well as the commercial implant Endopore (Innova Corp.) in this current animal model.
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Russ, Jonathan Brent. "Computational Design of Structures for Enhanced Failure Resistance." Thesis, 2021. https://doi.org/10.7916/d8-rfmz-6x23.
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The field of structural design optimization is one with great breadth and depth in many engineering applications. From the perspective of a designer, three distinct numerical methodologies may be employed. These include size, shape, and topology optimization, in which the ordering typically (but not always) corresponds to the order of increasing complexity and computational expense. This, of course, depends on the particular problem of interest and the selected numerical methods. The primary focus of this research employs density-based topology optimization with the goal of improving structural resistance to failure.
Beginning with brittle fracture, two topology optimization based formulations are proposed in which low weight designs are achieved with substantially increased fracture resistance. In contrast to the majority of the current relevant literature which favors stress constraints with linear elastic physics, we explicitly simulate brittle fracture using the phase field method during the topology optimization procedure. In the second formulation, a direct comparison is made against results obtained using conventional stress-constrained topology optimization and the improved performance is numerically demonstrated. Multiple enhancements are proposed including a numerical efficiency gain based on the Schur-complement during the analytical sensitivity analysis and a new function which provides additional path information to the optimizer, making the gradient-based optimization problem more tractable in the presence of brittle fracture physics.
Subsequently, design for ductile failure and buckling resistance is addressed and a numerically efficient topology optimization formulation is proposed which may provide significant design improvements when ductile materials are used and extreme loading situations are anticipated. The proposed scheme is examined regarding its impact on both the peak load carrying capacity of the structure and the amount of external work required to achieve this peak load, past which the structure may no longer be able to support any increase in the external force. The optimized structures are also subjected to a post-optimization verification step in which a large deformation phase field fracture model is used to numerically compare the performance of each design. Significant gains in structural strength and toughness are demonstrated using the proposed framework.
Additionally, the failure behavior of 3D-printed polymer composites is investigated, both numerically and experimentally. A large deformation phase field fracture model is derived under the assumption of plane-stress for numerical efficiency. Experimental results are compared to numerical simulations for a composite system consisting of three stiff circular inclusions embedded into a soft matrix. In particular, we examine how geometric parameters, such as the distances between inclusions and the length of initial notches affect the failure pattern in the soft composites. It is shown that the mechanical performance of the system (e.g. strength and toughness) can be tuned through selection of the inclusion positions which offers useful insight for material design.
Finally, a size optimization technique for a cardiovascular stent is proposed with application to a balloon expandable prosthetic heart valve intended for the pediatric population born with Congenital Heart Disease (CHD). Multiple open heart surgical procedures are typically required in order to replace the original diseased valve and subsequent prosthetic valves with those of larger diameter as the patient grows. Most expandable prosthetic heart valves currently in development to resolve this issue do not incorporate a corresponding expandable conduit that is typically required in a neonate without a sufficiently long Right Ventricular Outflow Tract (RVOT). Within the context of a particular design, a numerical methodology is proposed for designing a metallic stent incorporated into the conduit between layers of polymeric glue. A multiobjective optimization problem is solved, not only to resist the retractive forces of the glue layers, but also to ensure the durability of the stent both during expansion and while subject to the anticipated high cycle fatigue loading. It is demonstrated that the surrogate-based optimization strategy is effective for understanding the trade-offs between each performance metric and ultimately efficiently arriving at a single optimized design candidate. Finally, it is shown that the desired expandability of the device from 12mm to 16mm inner diameter is achievable, effectively eliminating at least one open heart surgical procedure for certain children born with CHD.
Book chapters on the topic "Prosthesis Computer-aided design"
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Ciocca, Leonardo, Achille Tarsitano, Claudio Marchetti, and Roberto Scotti. "Updates on the Construction of an Eyeglass-Supported Nasal Prosthesis Using Computer-Aided Design and Rapid Prototyping Technology." In Journal of Prosthodontics on Complex Restorations, 20–25. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274605.ch3.
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Murayama, T., M. Ogasawara, T. Eguchi, Y. Morishita, and M. Tamamoto. "Computer-Aided Technique for the Design and Manufacturing of Auricular Prostheses." In IFMBE Proceedings, 593–96. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02913-9_151.
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Swetha, R., and S. NirmalaDevi. "Design of Prosthetic Arm." In Advances in Parallel Computing. IOS Press, 2021. http://dx.doi.org/10.3233/apc210015.
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This paper proposes the design of the prosthetic arm by reconstructing the structure and proportions of an amputated arm using high precision methods and dimensions. To achieve this, CT images of the patient’s amputated and non-amputated arm are collected from the Rehabilitation centre. The patient CT data were imported to a 3D modelling software i.e., Mimics Innovation Suite version 22.0 Materialise 3-Matic version 14.0 original licensed software. The exported file is given to the Computer-Aided Design software, the geometry of the socket and the prosthetic arm were designed according to the mirrored geometry of the non-affected arm. 3D rendering for various degrees of movement has been carried out for animation.
Conference papers on the topic "Prosthesis Computer-aided design"
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Chen, Lei, Jeffery Plott, Matthew Hildner, Lillian Mei, Albert Shih, Jeffery Wensman, and Brian Kelly. "Computer-Aided Design and Additive Manufacturing of Custom Silicone Prosthetic Finger." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8420.
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Abstract Finger and partial finger amputations are one of the most frequently encountered forms of partial hand loss. Most of these amputees can benefit from prosthetic fingers, which should be both functional and aesthetic, to enhance rehabilitation by permitting a more normal professional and social life. Custom prosthetic fingers perform better than off-the-shelf ones due to better fit, comfort, and match to the patients’ physical characteristics. The conventional fabrication process for custom prosthetic fingers uses multiple impressions and molds combined with silicone injection molding to create the final shape. This process has not seen significant changes for decades and comes with a high cost and long wait time, stopping the prosthesis from benefitting the patient in a cost-effective, timely, and lifelike functional way. This study developed a new manufacturing approach for custom prosthetic fingers based on an additive manufactured custom thin-wall mold. The approach was based on optical 3D scanning of the amputees’ fingers and computer-aided design of custom finger prosthetic geometry and the corresponding thin-wall mold. Preliminary clinical study on an amputee patient shows the feasibility of this new custom molding approach and future work will clinically evaluate the performance of the prosthetic fingers created via the computer-aided design and additive manufacturing approach.
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Colombo, Giorgio, Stella Gabbiadini, Daniele Regazzoni, and Caterina Rizzi. "Design Procedure and Rules to Configure Lower Limb Prosthesis." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47651.
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Modular lower limb prosthesis is composed by custom-fit parts, such as the socket containing the residual limb, and standard components available on market, such as knee or foot. For both custom and standard parts the support offered by existing design tools is not efficient or integrated enough and, as a result, most prosthetists do not use computer-aided tools and still rely only on their personal expertise. This paper presents an approach to design and configure complete lower limb prosthesis for transfemoral and transtibial amputees, using patient’s digital data (e.g., residual limb model acquired by MRI) and specification sheets of components. The ultimate goal is to realise a virtual laboratory where the technicians can design lower limb prosthesis guided step by step by the system. We have identified key patient’s characteristics guiding the prosthetist during the four main steps of the production process: acquiring patient’s data, socket modelling, standard components selection and prosthesis assembly and check. The developed innovative framework integrates different tools to guide the technicians during each design task providing specific knowledge and rules. Thus, it allows a quicker and easier definition of the virtual prosthesis, on which virtual test could be performed (e.g., pressure distribution on residual limb, gait evaluation) in order to be able to realize the definitive prosthesis at the first attempt. The results have been evaluated and validated with the technical staff of a certified orthopaedic laboratory.
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Bu, Yunfeng, Quanping Sun, Xiaogang Chen, Qianliang Chen, and Xiang Zhang. "Research on the Algorithm of Tool Path Rapid Generation for NC Machining of Molar Prosthesis." In 2007 10th IEEE International Conference on Computer-Aided Design and Computer Graphics. IEEE, 2007. http://dx.doi.org/10.1109/cadcg.2007.4407946.
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Medellín Castillo, Hugo I., and Verónica Méndez Ruiz. "Design and Rapid Fabrication of Customised Ear Prosthesis: A Case Study in Biomedical Engineering." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88421.
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There are different methods to fabricate a facial prosthesis; the most common is the craftsmanship technique, which depends on the time, experience and skill of the surgeon. Although effective, it is an expensive method in terms of time and cost, and the precision of the prosthesis is limited to the manual sculpting skill of the surgeon. However, modern design and manufacturing technologies in engineering are increasingly being used in biomedical engineering applications such as prosthesis and implant design, surgical planning and tissue engineering. These modern engineering technologies have led to the enhancement of traditional medical methods in terms of accuracy, time, cost, resources and safety. In order to enhance the conventional craftsmanship technique used in the fabrication of facial prosthesis, this paper presents a new approach to design and manufacture customized ear prosthesis based on Reverse Engineering (RE) and Rapid Prototyping (RP) technologies. A case study is introduced and developed along paper. The ear prosthesis is designed using RE and Computer Aided Design (CAD). Fabrication of the prosthesis is carried out by RP and lost-wax casting. The results are presented and compared with the traditional craftsmanship technique. Advantages and disadvantages of using modern design and manufacture engineering techniques are identified and discussed.
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Yang, Hyunik, and David A. Hoeltzel. "Automatic Finite Element Mesh Generation Over Intersecting Rigid Body-Movable Subdomains for the Automation of Parametric Conceptual Design." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0115.
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Abstract An approach for the automatic generation and refinement of three dimensional finite element meshes subdivided by multiply connected, rigid body movable subdomains has been developed. A combination of computational geometry and geometric modeling techniques have been employed to implement parametric computer-aided design based on the finite element method. Nonconvexity of an overall three dimensional domain has been handled by combining convex geometric primitives as subdomains for the construction of a three dimensional domain. A clipping technique is employed for determining intersections points between subdomains bounded by triangulated surfaces, following their rigid body movements. To demonstrate the utility of this approach to parametric redesign, a series of meshes that model a hip joint prosthesis and a reciprocating internal combustion engine, as assemblies of parametrically-defined geometric primitives, have been developed.
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Medelli´n Castillo, Hugo I., and Manuel A. Ochoa Alfaro. "Development of a Tridimensional Visualization and Model Reconstruction System Based on Computed Tomographic Data." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62822.
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Medical image processing constitutes an important research area of the biomedical engineering since it provides accurate human body information for 3D visualization and analysis, diagnostic, surgical treatment planning, surgical training, prosthesis and implant design, wafer and surgical guides design. Computed tomography (CT) and magnetic resonance imaging (MRI) have had a great impact in the medicine since they can represent complex three dimensional (3D) anomalities or deformities. In this paper, the development of a system for tridimensional visualization and model reconstruction based on CT data is presented. The aim is to provide a system capable to assist the design process of prosthesis, implants and surgical guides by reconstructing anatomical 3D models which can be exported to any CAD program or computer aided surgery (CAS) system. A complete description of the proposed system is presented. The new system is able to visualize and reconstruct bone and/or soft tissues. Three types of renders are used: one for 3D visualization based on three planes, other for 3D surface reconstruction based on the well known marching cubes algorithm, and the other for 3D volume visualization based on the ray-casting algorithm. The functionality and performance of the system are evaluated by means of four case studies. The results have proved the capability of the system to visualize and reconstruct anatomical 3D models from medical images.
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Salazar-Salgado, Sara, and Elizabeth Rendón-Vélez. "Displacement of the Residual Limb Within Transfemoral Sockets: A Literature Review." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23416.
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Abstract According to the World Health Organization and the International Society for Prosthetics and Orthotics, between 0.5 to 0.8 percent of the global population has suffered limb amputations. In the last years, Colombia, Angola, Afghanistan, and Chechenia are the countries that have held the first places with the highest amount of landmine victims. In Colombia, this weapon has left more than 10.000 affected people, many of which have suffered traumatic lower limb amputation To recover some of the lost function, amputees are generally prescribed with a prosthesis. However, the adaptation of the user with this element depends on the comfort felt when using it and consequently, on the fit between the socket and the residual limb. The fit between these two elements is highly influenced by the relative motion between them (i.e. displacement, slip). Both excess of displacement or complete absence, have several negative consequences for the amputee. Thus, measuring displacement could be an important indicator of the quality of the socket and the suspension system, and could provide critical information to improve surgical interventions, the prescription of prosthetic elements and the design and development of new prosthetic components. Several authors have investigated this topic; however, the studies have been mostly conducted on transtibial amputees. Therefore, this review aims to summarize the gathered information about the displacement between the socket and residual limb in transfemoral amputees. A computer-aided systematic literature search was performed by two independent reviewers using three databases. The selected papers were evaluated with regards to: sample characteristics, displacement measurement instrument, measured activity, displacement axis, surfaces in contact, type of socket and type of suspension system used. Most of the studies were performed on less than five individuals with mature residual limbs and trauma caused amputation. The most common aspects of displacement were: imaging techniques (measurement instrument), gait (measured activity), vertical direction (displacement axis), bone/socket (surfaces in contact), quadrilateral (type of socket) and suction-based (suspension system). The optimal range of motion is still unknown for transfemoral amputees. A marker-based optical tracking system is promising for research purposes, while electronic sensors would be optimal for clinical use. Volume change may be an indirect and, more straightforward option to measure displacement. Further research is needed to determine the effect of using a modified socket, to find a way to measure relative motion inside the socket using marker-based optical tracking systems and to define the influence of subject-specific characteristics in the amount of displacement. A better understanding of what happens inside the socket helps to optimize prosthetic designs and to improve the amputee’s quality of life.
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Hsu, L. H., M. J. Tzeng, and J. T. Chen. "A Simplified Integration System for the Fabrication of Total Surface Bearing Transtibial Socket by Employing Rapid Prototyping Technology." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48877.
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This project is to validate the preliminary result of rapid prototyping (RP)-based transtibial socket that was reinforced by wrapping a layer of unsaturated polyester resin. By employing contemporary technologies including a scanner, computer-aided engineering systems, a rapid prototyping machine, together with the expertise of a prosthetist, RP-based prosthetic sockets with a comfortable fit to volunteer amputees can be fabricated. However, the expensive cost and complex procedure of using current commercial scanners and CAD systems will be barriers experienced by clinical professionals. As the existing service bureau infrastructure and cheaper RP technology are easily accessed, fabrication and technology cost barriers will be reduced. The remaining problems include the availability of easily-used CAD systems for designing prosthetic sockets, simple scanner and stump duplicating tool. This study therefore focuses on the integration of simplified systems including a vacuum forming tool, compact scanner and an interface system for designing prosthetic sockets. Although the type of PTB (patella tendon bearing) transtibial socket is widely adopted in plaster-based manual process, TSB (total surface bearing) sockets are more acceptable by amputees. Since the concept of TSB socket should obtain the stump mold of an amputee under appropriate pressure by using a specific stump forming tool, editing complex surfaces can be avoided when using a TSB-based stump model to design a socket. The quality of socket fit is expected to improve by a simplified design process in which an interface system based on grid-editing algorithms is utilized. In addition, cheaper RP technology, such as 3-D printing or droplet binding process, can be alternative means to fabricate RP-based prosthetic sockets. By combining TSB stump mold, simplified design process and a cheaper RP machine, this study proposes a simplified integrating system to manufacture RP stump mold. Using this RP stump mold together with the traditional lamination method of infiltrating resin into cotton layers, the RP-based transtibial sockets will then be fabricated easily. The expected result will demonstrate the feasibility of employing cheaper emerging technologies to assist an unskilled prosthetist who will be able to produce good quality of prosthetic socket.
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Parkhomenko, Anzhelika, Olga Gladkova, and Yaroslav Zalyubovskiy. "Investigation and Realisation of Prototyping Technologies for Robotic-Prostheses Computer Aided Design." In 2019 IEEE 15th International Conference on the Experience of Designing and Application of CAD Systems (CADSM). IEEE, 2019. http://dx.doi.org/10.1109/cadsm.2019.8779251.
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Din, Tengku Noor Daimah Tengku, Nafij Jamayet, Zainul Ahmad Rajion, Norhayati Luddin, Johari Yap Abdullah, Abdul Manaf Abdullah, and Suzana Yahya. "Design and fabrication of facial prostheses for cancer patient applying computer aided method and manufacturing (CADCAM)." In TRANSLATIONAL CRANIOFACIAL CONFERENCE 2016 (TCC 2016): Proceedings of the 1st Translational Craniofacial Conference 2016. Author(s), 2016. http://dx.doi.org/10.1063/1.4968858.
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