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Models for Planning and Simulation in Computer Assisted Orthognatic Surgery  [PDF]
Matthieu Chabanas,Christophe Marecaux,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: Two aspects required to establish a planning in orthognatic surgery are addressed in this paper. First, a 3D cephalometric analysis, which is clini-cally essential for the therapeutic decision. Then, an original method to build a biomechanical model of patient face soft tissue, which provides evaluation of the aesthetic outcomes of an intervention. Both points are developed within a clinical application context for computer aided maxillofacial surgery.
Computer aided planning and navigation for orbito-zygomatic reconstruction  [PDF]
Christophe Marecaux,Matthieu Chabanas,Yohan Payan,Franck Boutault
Physics , 2007,
Abstract: This paper suggests a full protocol of Computer Aided Surgery as previously recommended in literature addressing the challenging task of primary or secondary reconstruction of orbito-zygomatic dislocation. First, on a specifically developed planning software, the best zygoma reduction and orbital boundaries reconstruction to achieve skeletal symmetry are determined. This treatment plan is then transferred to the 3D Navigation Systems within the operating room. After patient's anatomy registration to his preoperative CT scan data, the navigation system allows zygomatic guiding to its planned reduced location and bone orbital volume restoration control. The feasibility of this technique was checked in 3 patients with major orbito-zygomatic deformities. Preliminary clinical results are presented.
Maxillofacial computer aided surgery: a 5 years experience and future  [PDF]
Christophe Marecaux,Matthieu Chabanas,Vincent Luboz,Annaig Pedrono,Franz Chouly,Pascal Swider,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: This paper gives a review of the experience provided by our group in terms of computer aided maxillo-facial surgery.
Computer-aided endoscopic sinus surgery: a retrospective comparative study  [cached]
Al-Swiahb Jamil,Al Dousary Surayie
Annals of Saudi Medicine , 2010,
Abstract: Background and Objectives : Endoscopic sinus surgery (ESS), markedly improved with the introduction of new preoperative imaging techniques, intraoperative visualization tools, and the use of surgical navigation systems. In this retrospective study we evaluated the usefulness of CT-guided endscopic sinus surgery and studied its advantages over conventional endscopic sinus surgery. Methods : We retrospectively reviewed the records of 60 randomly chosen patients with chronic rhinosinusitis (CRS) and moderate-to-severe sinonasal polyposis, undergoing endoscopic sinus surgery with surgical navigation (n=30) and without navigation (n=30). Data on the operative note, time of surgery, complications, and recurrence rate were collected and analyzed. Results : Of the 60 patients, 40 (66.7%) were diagnosed with CRS and 20 (33.3%) had allergic fungal sinusitis. Primary surgery was performed in 37 (61.7%) and revision surgery was performed in 23 (38.3%) cases. The computer-aided surgery (CAS) group included 28 (93.3%) patients with extensive disease and 12 (40%) with bone erosions, with intraorbital or extradural extension, while the non-CAS group included 24 (80%) patients with extensive disease and seven (23.3%) with bone erosions, with intraorbital or extradural extension. The average operative time was approximately 13 minutes greater in the navigation group, with significant improvement in the recurrence rate (n=11, 36.7% in the non-CAS group; n=5, 16.7% in the CAS group), and intraoperative complications were fewer in the CAS group (two exposures of orbital fat in the non-CAS group; no complications in the CAS group). Conclusion : Computer navigational systems appear to serve as a valuable adjunct in preoperative planning and safe intraoperative dissection.
Development of the computer-aided process planning (CAPP) system for polymer injection molds manufacturing  [PDF]
J. Tepi?,V. Todi?,D. Luki?,M. Milo?evi?
Metalurgija , 2011,
Abstract: Beginning of production and selling of polymer products largely depends on mold manufacturing. The costs of mold manufacturing have significant share in the final price of a product. The best way to improve and rationalize polymer injection molds production process is by doing mold design automation and manufacturing process planning automation. This paper reviews development of a dedicated process planning system for manufacturing of the mold for injection molding, which integrates computer-aided design (CAD), computer-aided process planning (CAPP) and computer-aided manufacturing (CAM) technologies.
Using a smart phone for information rendering in Computer-Aided Surgery  [PDF]
Le Bellego Gael,Marek Bucki,Ivan Bricault,Jocelyne Troccaz
Computer Science , 2011,
Abstract: Computer-aided surgery intensively uses the concept of navigation: after having collected CT data from a patient and transferred them to the operating room coordinate system, the surgical instrument (a puncture needle for instance) is localized and its position is visualized with respect to the patient organs which are not directly visible. This approach is very similar to the GPS paradigm. Traditionally, three orthogonal slices in the patient data are presented on a distant screen. Sometimes a 3D representation is also added. In this study we evaluated the potential of adding a smart phone as a man-machine interaction device. Different experiments involving operators puncturing a phantom are reported in this paper.
Computer-aided planning for zygomatic bone reconstruction in maxillofacial traumatology  [PDF]
Sylvain Maubleu,Christophe Marecaux,Matthieu Chabanas,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: An optimal planning procedure has been proposed to define the target position of the zygomatic bone following a fracture of the mid-face skeleton. The protocol has been successfully tested on healthy subjects, and ensures the global symmetry of the face could be obtained after the reconstruction surgery. Now that the planning procedure is available, the next step of this project will be to develop an intra-operative guiding system to help the surgeon to follow the planning. This procedure will mainly rely on the intra-operative registration of the zygomatic bone fragment, and the design of specific surgical ancillaries for cranio-maxillofacial surgery.
An Integrated Geometric Modeling Methodology for 2.5D Cylindrical Prismatic Part for Computer Aided Process Planning  [PDF]
Viswa Mohan Pedagopu, Manish Kumar
Intelligent Control and Automation (ICA) , 2014, DOI: 10.4236/ica.2014.54020
Abstract: The field of solid modeling has created numerous techniques for unambiguous computer representations of three-dimensional objects. Its data structures and algorithms have been used in a broad range of applications: Computer-Aided Design and Computer-Aided Manufacturing (CAD/ CAM), robotics, computer vision, computer graphics and visualization, virtual reality, etc. This research paper is used to generate process plan from feature-based modeling, based on an integrated geometric modeling system that supports both feature-based modeling and information storage. Present system is developed only for milling components and limited to selective machining features for prismatic components and further implemented for more machining features to develop algorithms for modeling the components through the input of machining features. As a result, feature information is directly available to downstream activities, and feature extraction is no longer needed. The various systematic steps involved in this approach are study of Design, identification of Features, selection of Processes, Tools and Machines, Machining and Inspection [DFPTMMI]. Machining features generated in the design stage are recognized and stored under the Visual Basic control of CATIA software ActiveX interface. Algorithms are developed for individual features and these algorithms are embedded in Visual Basic forms. This system is discussed and suited for 2.5 Dimensional part approach, however, that can be extended to 3 dimensional prismatic part and complex features machining. Finally a process planning chart has been presented as a model process planning.
Recent achievements in computer aided process planning and numerical modelling of sheet metal forming processes  [PDF]
M. Tisza
Journal of Achievements in Materials and Manufacturing Engineering , 2007,
Abstract: Purpose: of this paper: During the recent 10-15 years, Computer Aided Process Planning and Die Design evolved as one of the most important engineering tools in sheet metal forming, particularly in the automotive industry. This emerging role is strongly emphasized by the rapid development of Finite Element Modelling, as well. The purpose of this paper is to give a general overview about the recent achievements in this very important field of sheet metal forming and to introduce some special results in this development activity.Design/methodology/approach: Concerning the CAE activities in sheet metal forming, there are two main approaches: one of them may be regarded as knowledge based process planning, whilst the other as simulation based process planning. The author attempts to integrate these two separate developments in knowledge and simulation based approach by linking commercial CAD and FEM systems.Findings: Applying the above approach a more powerful and efficient process planning and die design solution can be achieved radically reducing the time and cost of product development cycle and improving product quality.Research limitations/implications: Due to the different modelling approaches in CAD and FEM systems, the biggest challenge is to enhance the robustness of data exchange capabilities between various systems to provide an even more streamlined information flow.Practical implications: The proposed integrated solutions have great practical importance to improve the global competitiveness of sheet metal forming in the very important segment of industry.Originality/value: The concept described in this paper may have specific value both for process planning and die design engineers.
A Computer Aided Process Planning System Based on Web and XML

QU Su-chao,ZHANG Shi-jie,

计算机应用研究 , 2004,
Abstract: A Computer Aided Process Planning (CAPP) system based on Web and XML is described in the paper. Some key technologies of the system are discussed such as the framework and the information flow of the system, the XML-based process files representation, the operations on the XML-based process files by process rules and how to deal with XML files on the client. In the Web environment, exchanging data with XML between browser and server can meet enterprises'needs of process planning. It not only promotes the performance of the system but also solves some problems of developing application systems based on B/S model.
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