Dissertations / Theses on the topic 'CAM'
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Gandhi, Ashit R. "A CAD/CAM interface for computer-aided design of cams." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/41555.
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The purpose of this thesis is to provide a complete package for the design and three dimensional modeling display of cams.
The software produced as a part of this work will operate as a module of CADAM to produce cam designs and enter the resulting cam as a CAD model and produce the graphical display of the cam.
In addition to the introductory material, this thesis is divided into four sections. The section on the graphics packages used in this thesis includes a brief history and capabilities of each of the packages. The second section details the procedure to be adopted in order to design a cam. The next section details ANICAM, the program that has been developed to incorporate the design and display procedure. The fourth section of this thesis contains recommendations for further work in this area.
The theoretical work in this project is a combination of original derivations and applications of the theory in the design literature.
Master of Science
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Silva, Villarroel Gonzalo. "Cestería CAD/CAM en mimbre." Tesis, Universidad de Chile, 2013. http://www.repositorio.uchile.cl/handle/2250/112826.
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Diseñador IndustrialNo autorizada por el autor para ser publicada a texto completo
Este proyecto trata, a modo de un proyecto experimental, de una transferencia de conocimiento desde el ámbito digital al área de producción artesanal de objetos. Consiste en el diseño de estructuras personalizables o paramétricas para el tejido en mimbre, que permitan generar objetos modificables y de mayor complejidad morfológica. Resuelve el problema de poco aprovechamiento actual del potencial de creación y conocimiento relacionado con la técnica del tejido en mimbre. Por medio de la forma y ensamble de piezas que, a modo de urdimbre, servirán de base para el tejido realizado por el artesano.
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Dhamija, Dinesh. "Macintosh - Bridgeport communications CAD/CAM." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182784285.
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Stawarczyk, Bogna. "Langzeitstabilität von CAD/CAM-Kunststoffen." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-161094.
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Cheikh, Abdelmadjid. "Functional tolerancing in CAD/CAM." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278691.
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Добротворский, Сергей Семенович, Евгения Владимировна Басова, and Роман Витальевич Головатый. "Опыт создания современных технологий с применением передовых CAD/CAM/CAE систем." Thesis, НТУ "ХПИ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20166.
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Slivko, Giedrė. "Biologinių neuronų mokymosi savybių tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080902_100150-63821.
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Ankstesni tyrimai, susiję su laikinėmis sinapsinio efektyvumo pasikeitimo taisyklėmis per nuo veikimo potencialų poravimo priklausantį plastiškumą, praktiškai nekreipė jokio dėmesio į neuronų erdvines savybes. Mes nagrinėjame nuo kalcio/kalmodulino priklausančią kinazę II (CaMKII) ir kalcineuriną (CaN) artimuosiuose ir tolimuosiuose spygliuose bei jų įtaką ilgalaikei potenciacijai ir ilgalaikei depresijai. Tyrimų metu buvo atskleista, kad esant neigiamam veikimo potencialų laiko poravimui tolimoje sinapsėje gali vykti ilgalaikė potenciacija, tuo tarpu artimajame spyglyje visi procesai vyksta remiantis klasikinėmis sinapsinio plastiškumo taisyklėmis. Gauti rezultatai teigia, kad sinapsės vieta dendritiniame medyje yra lemiamas veiksnys nuo veikimo potencialų laikų poravimo priklausančiame sinapsiniame plastiškume.Previous studies focusing on the temporal rules governing changes in synaptic efficacy during spike timing-dependent plasticity (STDP) have paid little attention to spatial characteristics of neurons. We analyze the activity of calcium-calmodulin dependent protein kinase II (CaMKII) and phosphatase calcineurin (CaN) in proximal and distal spines and their impact on long-term potentiation (LTP) and long-term depression (LTD). During tests we found that at negative timing of action potentials in distal spine synapse can undergo LTP while in proximal spine the processes follow the classic STDP rules. Our results suggest that synapse location within the dendritic tree is a crucial determinant of STDP.
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Mazzoni, Simona <1977>. "Ricostruzione mandibolare con tecnologia CAD-CAM." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5622/1/Mazzoni_Simona_Tesi.pdf.
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L’obbiettivo di una ricostruzione micro vascolare di mandibola è quello di assicurare al paziente il miglior risultato estetico e funzionale auspicabile. Ciò può essere conseguito utilizzando il lembo microvascolare di perone/cresta iliaca e una placca ricostruttiva in titanio che funga da guida nella fase di modellamento del lembo per ricreare un contorno parabolico il più possibile simile al profilo mandibolare originario del paziente.
Il modellamento manuale ed artigianale intraoperatorio di una placca ricostruttiva è operatore dipendente ed anche in mani molto abili o ricorrendo a modelli anatomici stereolitografici non sempre risulta preciso quanto voluto e spesso non porta ai risultati postoperatori attesi e desiderati.
Obbiettivo del nostro studio è stato pertanto, sfruttando le moderne tecnologie CAD-CAM, la produzione di placche ricostruttive “custom -made” progettate direttamente al computer ricreanti il profilo osseo originale del paziente.This paper describes a new protocol for mandibular reconstruction. CAD/CAM technology was used to manufacture custom-made cutting guides for tumor ablation and reconstructive plates to support fibula free flaps in five patrients presenting oral tumour involving the mandibular bone. CT scan data from the patients were elaborated to produce a virtual surgical plan of mandibular osteotomy in safe tissue for complete ramus/body resection. The CAD/CAM procedure was used to construct a customized surgical device composed of a cutting guide and a titanium reconstructive bone plate. The cutting guide allowed the surgeon to precisely transfer the virtual planned osteotomy into the surgical environment. The bone plate, including in two cases a custom-made anatomical condylar prosthesis, was designed using the outer surface of the healthy side of the mandible to obtain an ideal contour and avoid the bone deformities present on the side affected by the tumor. Operation time was reduced in the demolition and reconstruction phases. Functional and aesthetic outcomes allowed patients to immediately recover their usual appearance and functionality. This new protocol for mandibular reconstruction using CAD/CAM to construct custom-made guides and plates may represent a viable way to reproduce the patient's anatomical contour, give the surgeon better procedural control, and reduce operation time.
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Mazzoni, Simona <1977>. "Ricostruzione mandibolare con tecnologia CAD-CAM." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5622/.
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L’obbiettivo di una ricostruzione micro vascolare di mandibola è quello di assicurare al paziente il miglior risultato estetico e funzionale auspicabile. Ciò può essere conseguito utilizzando il lembo microvascolare di perone/cresta iliaca e una placca ricostruttiva in titanio che funga da guida nella fase di modellamento del lembo per ricreare un contorno parabolico il più possibile simile al profilo mandibolare originario del paziente.
Il modellamento manuale ed artigianale intraoperatorio di una placca ricostruttiva è operatore dipendente ed anche in mani molto abili o ricorrendo a modelli anatomici stereolitografici non sempre risulta preciso quanto voluto e spesso non porta ai risultati postoperatori attesi e desiderati.
Obbiettivo del nostro studio è stato pertanto, sfruttando le moderne tecnologie CAD-CAM, la produzione di placche ricostruttive “custom -made” progettate direttamente al computer ricreanti il profilo osseo originale del paziente.This paper describes a new protocol for mandibular reconstruction. CAD/CAM technology was used to manufacture custom-made cutting guides for tumor ablation and reconstructive plates to support fibula free flaps in five patrients presenting oral tumour involving the mandibular bone. CT scan data from the patients were elaborated to produce a virtual surgical plan of mandibular osteotomy in safe tissue for complete ramus/body resection. The CAD/CAM procedure was used to construct a customized surgical device composed of a cutting guide and a titanium reconstructive bone plate. The cutting guide allowed the surgeon to precisely transfer the virtual planned osteotomy into the surgical environment. The bone plate, including in two cases a custom-made anatomical condylar prosthesis, was designed using the outer surface of the healthy side of the mandible to obtain an ideal contour and avoid the bone deformities present on the side affected by the tumor. Operation time was reduced in the demolition and reconstruction phases. Functional and aesthetic outcomes allowed patients to immediately recover their usual appearance and functionality. This new protocol for mandibular reconstruction using CAD/CAM to construct custom-made guides and plates may represent a viable way to reproduce the patient's anatomical contour, give the surgeon better procedural control, and reduce operation time.
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Collin, Andrew (Andrew Paul) Carleton University Dissertation Management Studies. "Factors affecting implementation success of CAD and CAM additions to CAD/CAM systems: operating level personnel's perspective." Ottawa, 1994.
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López, Alcalá Cristina. "Regulación de K-Ras por Ca2+/CaM." Doctoral thesis, Universitat de Barcelona, 2006. http://hdl.handle.net/10803/919.
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Las proteínas de la superfamilia Ras son pequeñas proteínas G monoméricas de pesos moleculares de entre 20 y 40 kDa que actúan como interruptores moleculares regulando el inicio, duración y finalización de una gran variedad de funciones celulares (Takai, Yoshimi et al. 2001). Esta superfamilia comprende más de 150 proteínas (Fig. 1) con homólogos encontrados en Drosophila, C.Elegans, S. cerevisiae, Dictyostelium y en plantas. Las proteínas Ras más conocidas y estudiadas, H, N y K-Ras, son los miembros fundadores de esta gran familia, la cual se divide en 5 subfamilias en base a similitudes en la secuencia y funcionalidad de las proteínas que las componen: Ras, Rho, Rab, Ran y Arf (Fig. 2) (Wennerberg, Krister et al. 2005)
Además de compartir una estructura parecida, todas estas proteínas tienen unas características generales comunes: tienen capacidad de unir nucleótidos de guanina (GTP o GDP), poseen actividad GTPasa intrínseca y necesitan estar unidas a sistemas de membrana para realizar su función.
Las GTPasas de la superfamilia Ras funcionan como interruptores moleculares regulados por la unión al nucleótido GTP o GDP. Existen unas secuencias consensus, llamadas "G box", comunes a todas las proteínas de la superfamilia Ras, en el extremo N-terminal (Takai, Yoshimi et al. 2001). Estas secuencias son las responsables para la interacción con GDP o GTP y para la actividad GTPasa.
Estas pequeñas GTPasas tienen una elevada afinidad por el GDP y el GTP y presentan baja actividad GTPasa intrínseca. El ciclo GDP/GTP está controlado por dos tipos de proteínas reguladoras: Las proteínas intercambiadoras de nucleótidos "GEFs" (Guanine-nucleotide-exchange factors) promueven la formación de la forma activa de la GTPasa unida a GTP (Schmidt, Anja and Hall, Alan 2002) (Mitin, N. et al. 2005) y las proteínas "GAPs" (GTPase-activating proteins) aceleran la hidrólisis del GTP y por tanto aceleran la formación de la forma inactiva de la GTPasa unida a GDP(Bernards, Andre and Settleman, Jeffrey 2005). Las GTPasas de una misma rama de la superfamilia pueden compartir o no diferentes GEFs y GAPs. Las GTPasas de ramas diferentes presentan diferentes GAPs y GEFs en cuanto estructura pero que, mecanísticamente son similares.
El que la GTPasa esté unida a GTP o GDP comporta dos conformaciones similares pero muy distintas en dos regiones muy concretas de la proteína: la Switch I y la Switch II. El cambio conformacional de la proteína unida a GTP posee una elevada afinidad por los efectores. Estos cambios en el Switch I y II son los que permiten a las proteínas reguladoras, GAPs y GEFs y, a las efectoras, sensar el nucleótido al que la GTPasa se encuentra unido. Las proteínas Arf y las proteínas Ran tienen secuencias en el extremo amino y carboxi terminal respectivamente, que también sufren unos cambios conformacionales significativos al estar unidas a GTP o GDP.
En general las GTPasas son activas cuando se encuentran unidas a GTP, pero, para las proteínas Rab, Arf y Ran el estar unidas a GDP comporta también unas determinadas funciones específicas.
La presente tesis se concentra en dos objetivos: el primero, determinar el dominio de unión de K-Ras a Calmodulina, y el segundo, investigar cómo afecta esta interacción a la funcionalidad de K-Ras
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Halder, Julia. "Marginale Passgenauigkeit CAD/CAM-gefertigter Titan-Kronenkäppchen." Diss., lmu, 2003. http://nbn-resolving.de/urn:nbn:de:bvb:19-12470.
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梁振邦 and Chun-bong Leung. "Conversion of features for CAD/CAM integration." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31237290.
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Mercer, Tim. "CAD/CAM selection for small manufacturing companies." Online version, 2000. http://www.uwstout.edu/lib/thesis/2000/2000mercert.pdf.
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Leung, Chun-bong. "Conversion of features for CAD/CAM integration /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19634961.
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Šebesta, Vít. "Aplikace CAD/CAM softwaru hyperMILL při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399331.
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The main aim of this thesis is to acquire basic knowledge of CAM program hyperMILL 2019 with comparison of the ball nose end mill and circle segment end mill with taper form, economical evaluation and than make force analysis of specimen from aluminium alloy by milling with spindle moulder. Another aim of this thesis is also an analysis of force effects and force directions of the milling tool, advantages by using the circle segment end mill with taper form, the most common types of aluminium alloys and their mechanical properties and next comparison of CAM program hyperMILL with other selected program in the theoretic part.
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Kuchař, Petr. "Aplikace CAD/CAM softwaru WorkNC při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400955.
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The aim of this thesis was to design core and cavity part of the injection moulding tool with regard to the possibilities of SKD Bojkovice company. The structure of the thesis was divided into two main parts - the theoretical part, where the necessary theory for the elaboration of the second part, the practical one was briefly introduced. In the practical part own plastic component was designed, constructed an injection mold with emphasis on the core and cavity parts of the injection moulding tool and produced the necessary production documentation. Subsequently, the process of manufacturing these parts of the mold was described, and a brief technical-economic evaluation of the manufacturing process took place at the very end.
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Spáčil, Petr. "Aplikace CAD/CAM softwaru PowerMILL při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229289.
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roject own model of workpiece. Choose competent machine tools for machining. Strategy analysis of machining in software PowerMILL. NC programs processing for given application. Experimental verification of NC programs with system Sinumerik 840D.
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Foltán, Petr. "Aplikace CAD/CAM softwaru FeatureCAM při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231011.
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The diploma thesis contains the manufacturing process of ingot mold part for pistons manufactured by gravity casting using FeatureCAM software. It deals with the selection of appropriate machinery and tooling, determining the cutting conditions and the solution selection of optimal machining strategies in FeatureCAM software. The whole machining process is verified by graphic simulation and is completed with drawing documentation of component.
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Paseka, Jan. "Optimalizace NC programu pomocí CAD/CAM software." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231402.
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Tendency of this master thesis is a proposal of savings in the process of technological production’s preparation in a manufacturing company. In the first part is elaborated general theoretical study of current components and NC programs. Based on this, and finished analysis was defined optimization’s proposals described in second part. Thanks this complete proposals comes to time and money savings, which are needed for implementation of prototype project into serial production.
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Blackwelder, Reid B. "CAM." Digital Commons @ East Tennessee State University, 2000. https://www.amzn.com/072168002X.
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Book Summary: The New Edition provides the latest, essential information on the symptoms, diseases, treatments, and procedures most commonly encountered in everyday practice. It features step-by-step clinical guidance for more than 320 common diseases and disorders, as well as explicit guidelines for over 60 office procedures. An organ-system organization, extensive alphabetical index, and cross references within the individual chapters make the information easy to find.
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Xue, Feng, and 薛峰. "Evolutionary computation of geodesic paths in CAD/CAM." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226978.
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Tor, S. B. "Geometric algorithms and data structures for CAD/CAM." Thesis, University of Westminster, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356320.
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Chaharbaghi, H. "Feature based design : integration of CAD and CAM." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/14321.
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The product model is the primary source of input for a process planning system. The basic requirement of a product modeller in the area of Generative Computer-Aided Process Planning (GCAPP) is to generate a complete, exact, unambiguous 3D product representation which is directly accessible to automated planning. Such a product representation must include geometry, material specification, surface finish data, features and their relationship to other features, and tolerances. The product representation has to be complete, since in an automated environment interactive input of missing information at a later stage has to be avoided. Automation of process planning requires the product data to be extracted from the product model without human interaction. With respect to the above requirements a principle called Feature Based Design has been investigated and developed. This method provides a part description at the design stage which is suitable for a GCAPP system. If a fully automated GCAPP is consolidated to the system a real integration of CAD and CAM will be achieved, which will support simultaneous engineering philosophy as well as providing a true foundation for CIM.
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Santos, Edgar Pereira dos [UNESP]. "CAD/CAM/Usinagem CNC integrado a engenharia reversa." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152068.
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A sociedade sempre busca inovações como facilitadores de processos para o alcance de objetivos propostos em distintas áreas, utilizando instrumentos, métodos e técnicas diversas. Dentre estas encontra-se a Engenharia Reversa (ER), que é o processo de engenharia afim de se obter um produto ou objeto a partir de um modelo original. Nos últimos anos, com a rápida evolução tecnológica , envolvendo máquinas, ferramentas e softwares, a ER passou a ser um recurso utilizado até mesmo por pequenas e médias empresas. O proposito desta pesquisa é avaliar o desempenho da aplicação de recursos de engenharia, tais como hardwares e softwares de baixo custo ou de uso livre, sobre a ER a fim de obter-se uma peça usinada em uma maquina CNC o mais fiel possível ao modelo físico original. Para isso foram aplicados os conceitos, os processos e recursos necessários nas etapas de reconstrução de um modelo físico , desde a digitalização 3D, utilizando scanners tridimensionais, o tratamento do objeto capturado, a reconstrução do modelo no software CAD até a geração do código G, por meio de softwares CAM, a ser enviado a uma máquina CNC para realização da usinagem e obtenção da peça modelo. Foi utilizado o scanner 3d manual Ciclop, cuja digitalização resultou em dimensões muitas próximas ao objeto original. Também foram utilizados os softwares Meshlab para tratamento do modelo digitalizado e o AutoCad Fusion 3D para criação do modelo CAD e geração dos processos de usinagem e código G, escolhidos devido a facilidade de uso e por serem softwares livres.
Society is always looking for innovations as process facilitators for the objectives in different areas, using tools, and various techniques. Among these is the Reverse Engineering (RE), which is the engineering process in order to obtain a product or object from a original model. In recent years, with the rapid technological evolution, involving machines, tools and software, ER has become a resource used until even by small and medium-sized enterprises. The purpose of this research is to evaluate the performance of engineering resources, such as hardware and software. low cost or free-use software on the RE in order to obtain a part machined in a CNC machine as faithful as possible to the original physical model. For applied the concepts, processes and resources required in the steps reconstruction of a physical model, since 3D scanning, using scanners dimensionality, the treatment of the captured object, the reconstruction of the model in the CAD software to the generation of the G code, through CAM software, to be sent to a CNC machine to perform the machining and obtain the model part. Was the Ciclop 3d manual scanner, whose many close to the original object. Meshlab softwares were also used for handling the scanned model and AutoCad Fusion 3D for creating the model and generation of the machining processes and G code, chosen due to ease of use and because they are free software.
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Santos, Edgar Pereira dos. "CAD/CAM/Usinagem CNC integrado a engenharia reversa /." Ilha Solteira, 2017. http://hdl.handle.net/11449/152068.
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Orientador: Ruis Camargo TokimatsuResumo: A sociedade sempre busca inovações como facilitadores de processos para o alcance de objetivos propostos em distintas áreas, utilizando instrumentos, métodos e técnicas diversas. Dentre estas encontra-se a Engenharia Reversa (ER), que é o processo de engenharia afim de se obter um produto ou objeto a partir de um modelo original. Nos últimos anos, com a rápida evolução tecnológica , envolvendo máquinas, ferramentas e softwares, a ER passou a ser um recurso utilizado até mesmo por pequenas e médias empresas. O proposito desta pesquisa é avaliar o desempenho da aplicação de recursos de engenharia, tais como hardwares e softwares de baixo custo ou de uso livre, sobre a ER a fim de obter-se uma peça usinada em uma maquina CNC o mais fiel possível ao modelo físico original. Para isso foram aplicados os conceitos, os processos e recursos necessários nas etapas de reconstrução de um modelo físico , desde a digitalização 3D, utilizando scanners tridimensionais, o tratamento do objeto capturado, a reconstrução do modelo no software CAD até a geração do código G, por meio de softwares CAM, a ser enviado a uma máquina CNC para realização da usinagem e obtenção da peça modelo. Foi utilizado o scanner 3d manual Ciclop, cuja digitalização resultou em dimensões muitas próximas ao objeto original. Também foram utilizados os softwares Meshlab para tratamento do modelo digitalizado e o AutoCad Fusion 3D para criação do modelo CAD e geração dos processos de usinagem e código G, escolhidos devid... (Resumo completo, clicar acesso eletrônico abaixo)
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Apxiпов, М. М. "Використання CAD/CAM систем в проєктуванні електроерозійної обробки." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/22676.
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Архіпова, М. М. Використання CAD/CAM систем в проєктуванні електроерозійної обробки : магістерська робота : 131 «Прикладна механіка» / М. М. Архіпова ; керівник роботи А. М. Єрошенко ; НУ «Чернігівська політехніка», кафедра технологій машинобудування та деревообробки. – Чернігів, 2021. – 130 с.Робота присвячена програмуванню електроерозійної обробки в середовищі програмних продуктів компанії AutoDesk. Показано на конкретному прикладі, що для виробництва прес-форм для виготовлення пластмасових виробів використо-вується як остаточна – електроерозійна обробка. Створюється 3-D модель пласт-масового виробу, прес-форми, електрода. Моделюється процес електроерозійної обробки.
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Xue, Feng. "Evolutionary computation of geodesic paths in CAD/CAM /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23457429.
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Lise, Diogo Pedrollo. "Cimentação adesiva de materiais CAD/CAM resina-cerâmica." reponame:Repositório Institucional da UFSC, 2015. https://repositorio.ufsc.br/xmlui/handle/123456789/169633.
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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Programa de Pós-Graduação em Odontologia, Florianópolis, 2015.Made available in DSpace on 2016-10-19T13:18:54Z (GMT). No. of bitstreams: 1 338968.pdf: 26388567 bytes, checksum: 2069b93e85f123b8ac3c78a879aef322 (MD5) Previous issue date: 2015
Objetivos: Avaliar o efeito de diferentes tratamentos de superfície e do tempo de armazenamento na resistência de união adesiva à microtração (µTBS) de blocos CAD/CAM do tipo resina-cerâmica. Materiais e Métodos: Dois tipos de blocos CAD/CAM resina-cerâmica (Cerasmart, GC e Enamic, Vita Zahnfabrik) foram seccionados em fatias com 4 mm de espessura, distribuídos em seis grupos e submetidos aos seguintes tratamentos de superfície: Grupo 1: sem tratamento; Grupo 2: jateamento com óxido de alumínio 27 µm + silano; Grupo 3: condicionamento com ácido hidrofluorídrico 5% por 60 seg + silano; Grupo4: condicionamento com ácido fosfórico 37% por 60 seg + silano; Grupo 5: jateamento; Grupo 6: jateamento + silano. Pares de fatias do mesmo material e grupo foram cimentadas umas às outras (n=3 espécimes sanduíches/grupo) utilizando um cimento resinoso dual autoadesivo para os grupos 1 ao 5, e uma resina fluida fotopolimerizável para o grupo 6. Após respectivamente três semanas e 6 meses de armazenamento em cloramina 0,5% à 37oC, os espécimes sanduíches foram seccionados em micro espécimes retangulares, desgastados na interface adesiva (forma de ampulheta) e submetidos ao teste de µTBS. Os dados foram estatisticamente analisados por um modelo linear de efeitos mistos considerando como fatores o tipo de material, o tratamento de superfície e o tempo de armazenamento, assim como suas interações de primeiro grau(p=0,05). Resultados: Independente do tratamento de superfície e tempo de armazenamento, os dois materiais resina-cerâmica apresentaram valores deµTBS sem diferença estatística. Após 3 semanas, todos os grupos obtiveram valores similares. Depois de 6 meses, os valores de resistência adesiva foram mantidos quando foi realizado o JAT com óxido de alumínio (Grupo 263) ou o condicionamento com HF (Grupo 5), ambos seguidos por silanização. O JAT seguido de silanização e o uso de uma resina fluida como agente cimentante também manteve a µTBS. A ausência de tratamento superficial (Grupo 1), o JAT isolado (Grupo 2) e o condicionamento com H3PO4 seguido de silanização (Grupo 6) resultaram em uma diminuição da µTBS. Conclusões: ambos materiais do tipo resina-cerâmica demonstraram µTBS similar, independente do tratamento de superfície. A criação de uma superfície microrretentiva através do JAT com óxido de alumínio ou condicionamento com HF, seguido de silanização, é necessária para manutenção resistência de união adesiva após 6 meses.
Objectives: To evaluate the effect of different surface treatments on the bond strength to resin-ceramic CAD/CAM blocks after six months. Materials and Methods: Two types of resin-ceramic CAD/CAM blocks (Cerasmart, GC; Enamic, Vita Zahnfabrik) were cut in slabs of 4-mm thickness, divided into six groups and subjected to the following surface treatments: Group 1: No treatment; Group 2: Sandblasting (SB); Group 3: SB + Silane; Group 4: SB + Silane; Group 5: 5% Hydrofluoric acid (HF) etching + Silane; Group 6: 37% Phosphoric acid (H3PO4) etching + Silane. Sections of the same group were luted together (n=3 sandwich specimens/group) using a dual-cure self-adhesive cement for all groups, except for Group 4 that were luted using a flowable light-curing composite. After three weeks of storage in 0.5% chloramine at 37oC, the sandwich specimens were sectioned in rectangular micro-specimens and trimmed to an hourglass shape. Part of the specimens was subjected to a micro-tensile bond strength (µTBS) test and the other half was tested after 6 months of storage. Data were statistically analyzed with a linear mixed effects model for the factors surface treatment, material type and storage period, together with their first-degree interactions (p=0.05). Results: The lowest bond strengths were obtained in the absence of any surface treatment (Group 1), while the highest bond strengths were obtained when the surface was roughened by either SB or HF etching, this in combination with chemical adhesion through silanization. Loss in bond strength was observed after six months when either surface roughening or silanization, or both, were omitted. Conclusions: Both resin-ceramic CAD/CAM blocks appeared equally bonding-receptive regardless of the surface treatment. Creating a microretentive surface by either SB or HF etching, followed by chemical adhesion using a silane coupling agent is mandatory to maintain the bond strength after six months.
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Kadlecová, Hana. "Aplikace CAD/CAM technologie pro vytvoření loga společnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230849.
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This thesis will address the design and production of the ATC Kolín comapny's logo. Thesis will be supported by the use of CAD/CAM programs. The choice of materials, components and tools will also be specified. Milling strategy will be designed with the PowerMill program. Two different methods of production will be compared. First one is the conventional machining on the FV 25 CNC vertical knee milling plant with the Heidenhain iTNC 530 controlling system. Where as the second one is the additive rapid prototypong technology with the usage of Fused Deposition Modeling method. The thesis is finished by the technical-economic evaluation with analysis and comparison of production alternatives.
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Мартыненко, А. А. "Применение онтологического подхода для реализации системы интелектуального поиска в области cals-, cad-, cam-, cae-технологий." Thesis, Видавництво СумДУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/18428.
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Ramos, Carla Müller. "Propriedades mecânicas e caracterização intrínseca de zircônia experimental para uso em sistemas CAD/CAM." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25148/tde-03092013-155032/.
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O objetivo deste estudo foi avaliar as propriedades mecânicas e as características intrínsecas de uma zircônia tetragonal policristalina parcialmente estabilizada por ítria (Y-TZP) experimental comparada a outras três Y-TZPs comercialmente disponíveis, a partir de blocos para sistema CAD/CAM. Os grupos foram: Y-TZP Experimental (ZE), Zirconcad (ZCA), IPS e.max ZirCad (ZMAX) e In Ceram YZ (ZYZ). Resistência flexural: 120 espécimes foram construídos para cada grupo (n=30) e submetidos ao ensaio de flexão em três pontos com velocidade de 0,5mm/min, de acordo com a ISO 6872. ANOVA a um critério foi utilizada para análise de diferenças significantes entre os grupos (α=0,05). Para a caracterização da resistência e longevidade dos materiais estudados, utilizou-se a análise estatística de Weibull por meio de dois parâmetros: o módulo de Weibull (m) e a resistência característica (δ0). Análise Fractográfica: a superfície da fratura dos espécimes foi analisada pelo microscópio eletrônico de varredura (MEV) sendo que o tamanho do defeito crítico (c) e a tenacidade à fratura (KIC) foi estimado por análise fractográfica quantitativa e sua caracterização por meio de análise fractográfica qualitativa. Espectroscopia Micro Raman: as fases da estrutura cristalina das diferentes Y-TZP foram identificadas por meio da detecção das bandas características. Houve diferença significativa (p <0,05) na resistência à flexão entre ZCA, que apresentou os menores valores, em comparação com ZE, ZMAX e ZYZ, que, por sua vez, foram semelhantes entre si. As superfícies fraturadas de todos os espécimes apresentaram marcas fractográficas características, sendo observada na superfície de ZCA uma maior quantidade de defeitos. Os valores de tenacidade à fratura de ZE foram significantemente diferente apenas para ZCA. Todos os materiais apresentaram as bandas características das fases tetragonal e monoclínica da Y-TZP. ZE mostrou-se semelhante em suas propriedades mecânicas e microestrutura às ZMAX e ZYZ, apresentando-se como um material promissor para uso em sistema CAD/CAM. ZCA apresentou os menores valores de resistência flexural e tenacidade à fratura o que sugere que a quantidade e distribuição de defeitos tem efeito sobre seu comportamento mecânico.The aim of this study was to evaluate the mechanical properties and the intrinsic characteristics of an experimental yttrium tetragonal zirconia partially stabilized (Y-TZP) compared the other three Y-TZPs commercially available starting block for CAD/CAM system. The groups were: Experimental Zirconia (ZE), Zirconcad (ZCA), IPS e.max ZirCad (ZMAX) and In Ceram YZ (ZYZ). Flexural strength: 120 specimens were constructed for each group (n=30) and subjected to bending test at three points crosshead speed of 0.5mm/min, according to ISO 6872. ANOVA test was used to analyze significant differences between groups (α=0.05). To characterize the strength and longevity of the materials, the Weibull statistical analysis by two parameters were used: the Weibull modulus (m) and the characteristic strength (δ0). Fractographic analyzes: the fracture surface of the specimens was analyzed by scanning electron microscope (SEM) and the size of the critical defect (c) and fracture toughness (KIC) was estimated by quantitative fractographic analysis and characterization through qualitative analysis. Micro Raman spectroscopy: phases of crystalline structures of different Y-TZP were identified by detecting the characteristic bands. Statistically significant (p <0.05) in flexural strength between ZCA, which had the lowest values compared with ZE, ZMAX and ZYZ, which in turn were similar. The fractured surfaces of all specimens showed similar fractographics characteristics and values of fracture toughness for ZE were significant difference only for ZCA. All materials showed the characteristic bands of tetragonal and monoclinic phases of zirconia. ZE were similar in its mechanical properties and intrinsic, which suggests that material capable of being used for the system CAD/CAM and applied clinically as framework.
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Sguizzardi, Silvio. "Modelando o futuro: a evolução do uso de tecnologias digitais no desenvolvimento de projetos de arquitetura." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/16/16132/tde-26012012-153604/.
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A pesquisa aborda processos criativos e produtivos da arquitetura contemporânea, a partir da história do desenvolvimento tecnológico da computação gráfica e sua influência sobre a atividade profissional do arquiteto. Baseada na análise projetual, de forma a explicitar a problemática colocada, toma como estudos de caso três projetos desenvolvidos em diferentes momentos dessa evolução: a Casa da Ópera de Sidney, na Austrália; o pavilhão H2Oexpo na ilha de Neeltje Jans, Holanda; e, o Museu Mercedes-Benz em Stuttgart, Alemanha. Através de uma análise crítica, procuramos entender as relações do uso de computadores no desenvolvimento e construção destes projetos. Para cada caso, foram analisadas as técnicas empregadas, os benefícios conquistados e inovações proporcionadas, bem como, as dificuldades, limitações e os desafios enfrentados, desde o início do desenvolvimento do projeto, ao término da execução da edificação. A leitura integral e objetiva do objeto baseia-se em acervo documental, material bibliográfico e no discurso e posicionamento de profissionais envolvidos, visando à compreensão da riqueza e diversidade do tema. O trabalho pretende dar uma contribuição ao entendimento desta relação, colaborando também para o estudos de questões projetuais ligadas as novas mídias, como forma de estabelecer uma base de conhecimento para a reflexão a respeito do uso de ferramentas da computação gráfica no universo arquitetônico.With the history of the graphic computation technological development and its influence on the architect\'s professional activity as the starting point, the present research addresses the creative and productive processes of contemporary architecture. Based on the project analysis as a way of explaining the problem being presented, three projects developed at different times along this evolution are presented as case studies: the Sydney Opera House, Australia; the H2Oexpo Pavilion in the island of Neeltje Jans, Netherlands; the Mercedes-Benz Museum in Stuttgart, Germany. By using a critical analysis we try to understand the relations in the use of computers in the development and building of these projects. The analysis of each case included the techniques that were used, the benefits obtained and innovations provided, as well as the difficulties, limitations and challenges that were faced from the very beginning of the project development until the building was constructed. In order to better understand the wealth and diversity of the theme, the collection of documents, bibliography and statements and positioning of the professionals involved were used to obtain a full and objective reading of the object. The present work was designed to bring a contribution to understand this relation, cooperating with the study of project issues related to the new media, as a way to establish a knowledge foundation to reflect on the use of graphic computation tools in the architectural universe.
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Chaudhari, Sachin B. "DEVELOPMENT OF AN INTERNET-BASED ANALYSIS TOOL USING THE BOUNDARY ELEMENT METHOD." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin971963697.
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Bao, Zhuojun. "Rechnerunterstützte Kollisionsprüfung auf der Basis eines B-rep/Polytree/CSG-Hybridmodells in einem integrierten CAD/CAM-System /." Düsseldorf : VDI-Verl, 2000. http://www.gbv.de/dms/bs/toc/319988562.pdf.
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Thornton, Ian. "Mechanical properties of dental resin composite CAD/CAM blocks." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/48603.
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Objective: The goal of this study was to determine the flexural strength (σf), flexural modulus (Ef) and fracture toughness (KIC) of two new commercially available nano-ceramic resin composite CAD/CAM blocks (Lava Ultimate and Enamic) and compare them to those of a widely-used ceramic CAD/CAM block (IPS e.max), that served as a control, in order to evaluate the clinical suitability of the former.
Materials and Methods: Fifty bars of Lava Ultimate and Enamic and twenty-five bars of e.max were made for three-point bending testing (to determine σf and Ef). Testing was completed on an Instron machine whereby a force was applied at a constant crosshead speed of 1 mm/min until failure occurred. Twenty-four 6x6x6x12 mm equilateral triangular prisms were fabricated from Lava Ultimate and Enamic and twelve from e.max for fracture toughness (KIC) testing using the notchless triangular prism specimen (NTP) KIC test. Half of the prepared Lava Ultimate and Enamic samples were stored in 37°C water for 30 days prior to testing, to analyze the aging effect. Weibull statistics were used to evaluate the characteristic strength and the reliability of each material. Two-way ANOVA and post-hoc Scheffé comparisons were used to further analyze the results.
Results: The σf, Ef and KIC of Lava Ultimate and Enamic were considerably lower than that of IPS e.max. Aging of Lava Ultimate and Enamic lowered the σf by 27 % and 12 % but increased the KIC by 10 % and 40 %, respectively. Aging also significantly lowered Ef of both samples. The σf of Enamic was statistically significantly lower than that of Lava Ultimate, while the Ef of Enamic was statistically significantly higher. Only in the aged samples were significant differences between KIC detected.
Conclusion: When compared to conventional resin composites, the presence of ceramic nano-particles in Lava Ultimate and Enamic did not greatly improve σf or KIC of these materials. The flexural modulus of Enamic was greatly improved to levels not seen before in dental resin composites. Based on the mechanical testing results obtained in this study, their consideration and clinical use should be similar to that of conventional dental resin composites.Dentistry, Faculty of
Graduate
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黃啓榮 and Kai-wing Wong. "A CAD/CAM system for sheet metal blanking dies." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31210594.
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Almustafa, Nawaf Mohammed. "The use of CAD CAM for fixed partial prostheses." Thesis, University of Dundee, 2016. https://discovery.dundee.ac.uk/en/studentTheses/7185f4c0-4f47-4072-8b0a-7ae09c1e8c01.
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Due to the increasing demand from patients and dentists for highly aesthetic and strong, metal-free restorations there has been a rapid increase in research into dental CAD CAM technique and zirconia based restorations over the last decade. Such new technology has the potential to take the place of conventional techniques and materials for fabricating indirect dental restorations in the future. In this PhD thesis, five laboratory studies were designed to investigate zirconia bridges constructed using dental CAD CAM. The studies concentrated on: 1. Ideal force applied by dentists for cementing zirconia bridges and the impact on seating. 2. The effect of firing cycles and zirconia thickness on the fit of zirconia bridges. 3. The effect of span length on the fit of three and four unit all zirconia bridges. 4. The effect of veneering on the strength of three unit zirconia bridges. 5. The fit of three unit all zirconia bridges produced by digital and conventional techniques. For these laboratory studies an ideal three unit (and four unit for study 3) fixed-fixed all ceramic bridge preparation was carried out on two plastic teeth and all SLA models and zirconia based bridges were made using the Lava COS and Lava™ CAD CAM system (3M, ESPE). In addition to the laboratory studies, a clinical audit was carried out to assess satisfaction (dentist, dental technician and patient) with zirconia based restorations (through a xvi series of questionnaires) made and fitted at Dundee Dental Hospital and School. In addition, as part of this audit a simple cost analysis was carried out to explore the differences in cost between zirconia based restorations and high fusing gold alloy based metal ceramic restorations. Four of the studies (studies 1, 2, 3 and 5) investigated the internal and marginal fit of the zirconia based restorations under differing laboratory and clinical procedures and conditions. It was found that the seating force used to cement a zirconia based bridge had no impact upon fit (Study 1). Whilst the thickness of zirconia (all-zirconia bridge and un-veneered zirconia framework) did not affect the fit of the restoration, veneering the framework did lead to a statistically significant deterioration in fit (Study 2). Although leading to a poorer fit veneering did have a positive effect in strengthening the zirconia framework, but neither un-veneered nor veneered frameworks were as strong as monolithic/all zirconia bridges (Study 4). Despite the high shrinkage during post milling sintering and the potential for greater distortion on longer span bridges, the longer span bridges investigated in Study 3 did not impact upon fit. In study 1, 2, 3 and 4 the Lava COS intra-oral scanner was used to create a digital impression of the tooth preparations and study 5 confirmed that the fit of bridges made from these impressions were better than those made using conventional addition cured silicone putty and wash impressions (Study 5). The results of the questionnaires used in the audit revealed high satisfaction rates with all stake holders and the cost analysis showed that producing zirconia based restorations can be five to six times cheaper than conventional gold based restorations. Despite the variations in fit which were found in Studies 2 and 5, all bridges produced were within what would be regarded as clinically acceptable and comparable to those produced with more traditional techniques.
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Allen, Richard David. "An agent-based approach to STEP-NC CAD/CAM." Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/33612.
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The search for automatic manufacture of components has been and continues to be a major goal of researchers since NC machines appeared in 1952. The ability to generate a NC tool path is now commonplace from CAD/CAM systems, but the technology used to program NC machines is still based on the original standards. Today under the IMS project named STEP-NC in Europe and Asia, and Super Model in the USA, industrialists and academics are collaborating to deliver a new data model for CNC machines entitled the ISO 14649 standard, informally known as STEP-NC. The author believes that the STEP-NC standard will provide software vendors with the basis to achieve this goal of automatic CNC manufacture.
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Борисов, М. О., П. О. Баєв, and О. Г. Аврунін. "Застосування CAD-CAM технології при виготовленні корсетів при сколіозі." Thesis, ХНУРЕ, 2019. http://openarchive.nure.ua/handle/document/8551.
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In theses, the use of CAD-CAM technology in the manufacture of corsets for scoliosis is given. Considered the advantages of this technology in the manufacture of corsets. Approval of CAD-CAM technology has confirmed the feasibility of its use in orthotics of the spine, as well as in the manufacture of orthoses for other body segments.
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Wong, Kai-wing. "A CAD/CAM system for sheet metal blanking dies /." [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13204841.
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Loehr, Birte [Verfasser], and Petra [Akademischer Betreuer] Gierthmühlen. "Monolithische CAD/CAM-Glaskeramik: Bruchlastergebnisse glasierter versus polierter Molarenkronen." Freiburg : Universität, 2019. http://d-nb.info/1216826455/34.
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Vinkler, Tomáš. "Aplikace CAD/CAM softwaru PowerMILL 6.0 při 3D obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228540.
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The diploma thesis contains detailed processing of a two-piece car form by means of possible accessible 3D strategies of CAM system PowerMILL, selecting of tools, economical evaluation and creation of NC program for CNC machining centre.
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Kafka, Lukáš. "Využití CAD/CAM technologie pro výrobu formy čerpadlového kola." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229137.
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The master thesis deals with design for casting mould of an impeller wheel for investment casting lost wax and machining technology with utilization CAD software SolidWorks 2008 and CAM software PowerMill 9. Subsequent verification of machining on vertical machining center MCV 1210. At the end, techno-economic evaluation is done.
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Ruebel, Michael Alexander Marcus Johannes [Verfasser], and Petra [Akademischer Betreuer] Gierthmühlen. "Einfluss der Schichtstärke von CAD/CAM gefertigten hybridkeramischen Molarenkronen auf die maximale Bruchlast nach Kausimulation im Vergleich zu monolithischen CAD/CAM gefertigten Zirkonoxidkronen." Freiburg : Universität, 2018. http://d-nb.info/1163200816/34.
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Karlsson, Catarina. "Användaranpassning av instruktioner." Thesis, University of Skövde, School of Humanities and Informatics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-2955.
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Detta arbete har syftat till att ta reda på vad som är viktigt att tänka på vid utformning av instruktioner för CAD-användare. Som praktikfall har en studie gjorts på Volvo IT där deras instruktioner för CAD/CAM/CAE-systemet CATIA V5 har granskats. Undersökningen mynnade ut i en användarstudie där erfarna användare av systemet fick möjlighet att diskutera den support som finns i dagsläget samt ställa krav på framtida instruktioner. Kraven som togs fram har legat till grund för riktlinjer för hur morgondagens instruktioner skulle kunna göras mer användaranpassade.
Några områden som är viktiga att ta hänsyn till är bland annat: att ta tillvara på användarnas erfarenhet, involvera användarna vid framtagandet av instruktionerna, ta reda på hur instruktionenrna läses samt skapa rubrikter som underlättar informationssökning för användarna.
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Carvalho, Adriana Oliveira 1981. "Influence of restorative material and technique on the mechanical performance of indirect restorations of endodontically treated molars or not = Influência do material e técnica restauradora na performance mecânica de coroas indiretas sobre molares tratados endodonticamente ou não." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287831.
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Orientadores: Marcelo Giannini, Pascal MagneTese (Doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Objetivos: Comparar a resistência à fadiga (RFAD) e à fratura (RFRA), o modo de falha e o desgaste do antagonista em contato com os diferentes designs de coroas CAD/CAM utilizadas para restaurar molares tratados endodonticamente/TE ou não, fabricadas em cerâmica feldspática/FEL, dissilicato de lítio/DL ou resina nano cerâmica/RNC e fixadas com cimento resinoso auto-adesivo. Materiais e Métodos: Para os capítulos um e dois, 90 molares foram preparados e restaurados com coroas com espessura de 1,5mm ou 0,7mm respectivamente, em FEL, DL ou RNC. Para os capítulos três e quatro, outros 90 molares tiveram a porção coronária removida (nível da junção cemento-esmalte), foram TE e restaurados utilizando três diferentes designs de núcleo de preenchimento em resina composta/NPRC (4-mm de altura, 2-mm ou sem núcleo de preenchimento/endocrown) associados a coroas em RNC ou DL respectivamente. Para o capítulo cinco, grupos dos capítulos um (RNC/1,5mm e DL/1,5mm), três (NPRC de 4-mm de altura/RNC) e quatro (NPRC de 4-mm de altura/DL) foram combinados. Todas as coroas do estudo foram confeccionadas pelo sistema CAD/CAM Cerec 3 e cimentadas com o cimento RelyX Unicem II Automix. As coroas em FEL e DL foram previamente condicionadas com ácido fluorídrico e silanizadas. As coroas em RNC, assim como os dentes preparados foram apenas jateados. Todas as restaurações foram submetidas ao teste de RFAD com um carregamento cíclico isométrico aplicado por uma esfera de resina composta. O carregamento começou com cargas de 200N (5.000x) seguidos por estágios de 400, 600, 800, 1000, 1200 e 1400N a um máximo de 30.000 ciclos cada. Os espécimes foram submetidos ao carregamento até a fratura ou por no máximo 185.000 ciclos. Os espécimes que resistiram a todos os ciclos foram novamente testados axialmente até a falha ou até uma carga máxima de 4.500N. Os espécimes foram classificados quanto ao modo de falha em: catastrófica, possivelmente reparável e reparável. Os grupos foram comparados utilizando uma análise de sobrevida para o teste de RFAD e t-test ou ANOVA para o teste de RFRA. Comparações Post hoc também foram utilizadas para comparar os diferentes grupos. Resultados: A taxa de sobrevida das coroas sobre os molares não TE foram: 80% (RNC/1,5mm), 6,6% (RNC/0,7mm), 93,3% (DL/1,5mm), 13,2% (DL/0,7mm), 6,6% (FEL/1,5mm) e 0% (FEL/0,7mm). A RFRA das coroas com 1,5mm de espessura foi: 3122N-RNC, 3237N-DL e 2500N-FEL. As coroas cimentadas sobre molares TE tiveram taxa de sobrevida e RFRA respectivamente de: 53%/2969N (RNC-4mm de altura), 100%/3181N (DL-4mm de altura), 87%/2794N (RNC-2mm de altura), 93%/3759N (DL-2mm de altura), 87%/2606N (RNC-endocrown) e 100%/3265N (DL-endocrown). No teste de RFAD houve falha catastrófica apenas para as coroas confeccionadas em RNC-4mm. Após o teste de RFRA todos os espécimes falharam catastroficamente. As coroas em RNC induziram menor desgaste aparente ao antagonista. Conclusão: Apenas as coroas FEL-0,7mm não sobreviveram além da máxima força mastigatória humana. Para os dentes não TE, as coroas em DL e RNC com espessuras de 1,5mm tiveram o melhor desempenho mecânico. Para os molares TE, uma maior carga para fratura foi requerida com o uso de coroas em DL-2mm. O tratamento endodontico não teve influência sobre a RFAD de molares restaurados com coroas CAD/CAM de DL, mas diminuiu a performance das RNC
Abstract: Objectives: To evaluate the fatigue resistance, load-to-failure, failure mode and antagonistic wear in contact with different designs of full CAD/CAM crowns made of feldspathic ceramic/FEL, lithium disilicate/LD or resin nano ceramic/RNC. These prosthetic materials were used to restore endodontic treated molars or not, using a simplified cementation process. Materials and Methods: Chapters One and Two used 90 molars, which had a standardization of full crown preparation and teeth were restored using crown made of FEL, LD and RNC with thickness of 1.5mm or 0.7mm, respectively. Chapters Three and Four used 90 molars decoronated at the level of CEJ, endodontically-treated and restored using three different Filtek Z100 adhesive core build-ups designs (4-mm-build-up; 2-mm-build-up; and no buildup/ endocrown preparation) combined to crowns made of RNC and LD, respectively. For Chapter Five, groups of Chapters One (RNC/1,5mm and LD/1,5mm), Three (4-mm-build-up/RNC) and Four (4-mm-build-up/LD) were combined. All molars were restored using the Cerec 3 CAD/CAM system and cemented with RelyX Unicem II Automix cement. FEL and LD restorations were conditioned by hydrofluoric acid etching and silanated. RNC restorations as well as all preparations were treated only with airborne-particle abrasion. All restorations were submitted to cyclic isometric loading applied through a composite resin hemi-sphere. The cyclic loading started with a load of 200N (x5000 cycles), followed by stages of 400, 600, 800, 1000, 1200, and 1400N at a maximum of 30,000 cycles each. Specimens were loaded until failure or for a maximum of 185,000 cycles. Survived specimens were axially loaded until failure or to a maximum load of 4,500N. After load tests, the specimens were analyzed for the failure mode: "catastrophic" tooth/root failure, "possibly reparable" failure and "reparable" failure. Groups were compared using the life table survival analysis (fatigue test) and the t-test, one-way or two-way ANOVA for the survived samples loaded to failure. Pairwise post hoc comparisons were used to compare the different groups. Results: The survival rates for the vital teeth were: 80% (RNC - 1.5mm), 6.6% (RNC - 0.7mm), 93.3% (LD - 1.5mm), 13.2% (LD - 0.7mm), 6.6% (FEL - 1.5mm) and 0% (FEL - 0.7mm). Post-fatigue load-to-failure for 1.5mm crowns ranged between 3122N (RNC), 3237N (LD) and 2500N (FEL). The survival rate and post-fatigue load to failure for non-vital teeth were 53% / 2969N (4mm - RNC), 100% / 3181N (4mm - DL), 87% / 2794N (2mm - RNC), 93% / 3759N (2mm - DL), 87% / 2606N (endocrown - RNC) e 100% / 3265N (endocrown - LD), respectively. There were only catastrophic failures for 4mm-build-up RNC during the fatigue test. All of specimens in the load-to-failure test exhibited non-restorable catastrophic fractures. Crowns made of RNC seemed to generate the least amount of antagonistic wear. Conclusions: FEL crowns with 0.7mm of thickness didn't survive beyond the maximum masticatory forces. RNC and LD crowns with 1.5mm thick had the best performance on vital teeth. LD crowns combined with short build-ups (2mm) were associated to highest loads to failure. Endodontic treatment did not influence the fatigue resistance of molars restored with LD CAD/CAM complete crowns but decreased the performance of RNC crowns
Doutorado
Materiais Dentarios
Doutora em Materiais Dentários
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Oung, Jianjun. "Design and implementation of an object-oriented geometric constraint solver." [Gainesville, Fla.] : University of Florida, 2001. http://etd.fcla.edu/etd/uf/2001/ank7123/thesis.pdf.
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Thesis (M.S.)--University of Florida, 2001.Title from first page of PDF file. Document formatted into pages; contains ix, 82 p.; also contains graphics. Vita. Includes bibliographical references (p. 78-81).