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Stress-strain analysis of mandible with applied fixator due to the missing bone tissue
Fňukal, Jan ; Valášek, Jiří (referee) ; Marcián, Petr (advisor)
This thesis deals with the fixation of lower jaw with bone tissue defect using commercially produced fixator. Large defects of bone tissue are mainly caused due to the removal of bone tissue affected by tumor. These topics have been researched on the basis of the literature. Subsequently, stress strain analysis of the lower jaw with the applied fixation plate was performed. This analysis was solved by using computational modeling with variational approach, ie the finite element method. The work also describes in detail the procedure of creating model of geometry, model of material, model of boundary conditions and loads with subsequent solution of several computational models. The stress strain analysis was done for lower jaw with varying size of the removed bone tissue with applied reconstruction plate made of CP-Ti Grade 4 and for the lower jaw with the plate, which is made of -Ti-Mo. Finally, the influence of the mechanical properties of the callus during formation of new bone tissue (callus healing) on the stress and deformation of the solved system was evaluated.
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Biomechanical Studies of Facial Bone
Valášek, Jiří ; Janíček, Přemysl (referee) ; Horyl, Petr (referee) ; Florian, Zdeněk (advisor)
Presented work deals with Biomechanical study of the facial skeleton. This work is focused on the fixation of the mandible after removal of a tumor from affected bone tissue. The aim of the work is to perform biomechanical study of the facial skeleton with subsequent detailed stress strain analysis of two mandible implants designed and manufactured for specific patients. The geometry model of mandible used for design of mandible implants and used for computational modelling has been obtained on the basis of CT data of two patients. A Theoretical-Clinical sub-study that deals with the comparison the CT data processing which is necessary for creating the model of geometry is a part of the thesis. Two models of mandible with applied mandible implant have been created for two specific patients with tumorous mandible bone tissue. Stress strain analysis has been performed for these two models. Results of the stress strain analysis of two models of mandibles with mandible implants are presented in the final chapters of the thesis. Findings of the biomechanical study have been published and applied in clinical practice.
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Determination of mechanical properties of cancellous bone tissue of skull bone
Votava, Tomáš ; Borák, Libor (referee) ; Marcián, Petr (advisor)
This bachelor thesis is focused on determination of mechanical properties of cancellous bone tissue of cranial bone. In research part of this study are described methods of medical imaging, mechanical properties of cranial bone tissue and anotomy of skull. Next one are described studies focused on determination mechanical properties of cancellous bone. Finally are decribed histomorphometric parameters and their measurement using software I$mageJ2$ and plugin $BoneJ2$. In practical part of this thesis, there are described measurement procedure, measurement results, 3D geometry modelling procedure by reconstruction micro-CT images and determination of mechanical properties solved by computational modeling using FEM. Five speciments are analyse predominantly from os occipitale. On first specimen is analyzed influence of thresholding settings.
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Estimation of bone mineral density of cancellous vertebral bone in multi-energy CT data
Líška, Martin ; Jakubíček, Roman (referee) ; Chmelík, Jiří (advisor)
The principle of the BMD estimation method presented in this thesis consists in the tomographic scanning of the axial skeleton by a CT system with two different energies. The BMD estimation method was applied to acquisitions scanned by CT system IQon Spectral CT (Philips) on seven patients, two men and five women, in the lumbo-sacral region. For the functionality of the method, it is necessary to know the standardized amounts of selected elemental components contained in a given tissue, specifically in the cancellous bone of the vertebra. In the first part, the thesis deals with the theoretical part of solving the estimation of BMD from dual-energy CT data, two equations with several unknowns and their modification. The practical part deals with the program solution of the method of calculating the estimation of bone minerals in dual-energy CT data. The outputs of the presented BMD estimation method were processed and statistically compared with the other two phantom-less BMD estimation methods. The functionality of the method and statistical processing were solved in MATLAB and STATISTICA softwares.
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Estimation of mechanical properties of the cancellous bone tissue of the proximal tibia
Leinweber, Vít ; Valášek, Jiří (referee) ; Marcián, Petr (advisor)
This bachelor thesis is focused on the determination of mechanical properties of cancellous bone tissue of proximal tibia. In the beginning of the work there is theoretical part which consists of a description of the tibia anatomy from macroscopic and microscopic view, treatise on the bone tissue growth, influences affecting the bone tissue growth and description of mechanical properties of the bone tissue. In the end of the theoretical part there is a detailed review of related literature to this work. In the practical part morphometric parameters are measured using software ImageJ and plugin BoneJ. The process of creating a computational model is described and results of mechanical properties are presented. Regression models of mechanical properties and histomorphometric parameters are created from these results.
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Estimation of mechanical properties of the cancellous bone tissue of the proximal tibia
Leinweber, Vít ; Valášek, Jiří (referee) ; Marcián, Petr (advisor)
This bachelor thesis is focused on the determination of mechanical properties of cancellous bone tissue of proximal tibia. In the beginning of the work there is theoretical part which consists of a description of the tibia anatomy from macroscopic and microscopic view, treatise on the bone tissue growth, influences affecting the bone tissue growth and description of mechanical properties of the bone tissue. In the end of the theoretical part there is a detailed review of related literature to this work. In the practical part morphometric parameters are measured using software ImageJ and plugin BoneJ. The process of creating a computational model is described and results of mechanical properties are presented. Regression models of mechanical properties and histomorphometric parameters are created from these results.
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|
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Determination of mechanical properties of cancellous bone tissue of skull bone
Votava, Tomáš ; Borák, Libor (referee) ; Marcián, Petr (advisor)
This bachelor thesis is focused on determination of mechanical properties of cancellous bone tissue of cranial bone. In research part of this study are described methods of medical imaging, mechanical properties of cranial bone tissue and anotomy of skull. Next one are described studies focused on determination mechanical properties of cancellous bone. Finally are decribed histomorphometric parameters and their measurement using software I$mageJ2$ and plugin $BoneJ2$. In practical part of this thesis, there are described measurement procedure, measurement results, 3D geometry modelling procedure by reconstruction micro-CT images and determination of mechanical properties solved by computational modeling using FEM. Five speciments are analyse predominantly from os occipitale. On first specimen is analyzed influence of thresholding settings.
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Estimation of bone mineral density of cancellous vertebral bone in multi-energy CT data
Líška, Martin ; Jakubíček, Roman (referee) ; Chmelík, Jiří (advisor)
The principle of the BMD estimation method presented in this thesis consists in the tomographic scanning of the axial skeleton by a CT system with two different energies. The BMD estimation method was applied to acquisitions scanned by CT system IQon Spectral CT (Philips) on seven patients, two men and five women, in the lumbo-sacral region. For the functionality of the method, it is necessary to know the standardized amounts of selected elemental components contained in a given tissue, specifically in the cancellous bone of the vertebra. In the first part, the thesis deals with the theoretical part of solving the estimation of BMD from dual-energy CT data, two equations with several unknowns and their modification. The practical part deals with the program solution of the method of calculating the estimation of bone minerals in dual-energy CT data. The outputs of the presented BMD estimation method were processed and statistically compared with the other two phantom-less BMD estimation methods. The functionality of the method and statistical processing were solved in MATLAB and STATISTICA softwares.
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Stress-strain analysis of mandible with applied fixator due to the missing bone tissue
Fňukal, Jan ; Valášek, Jiří (referee) ; Marcián, Petr (advisor)
This thesis deals with the fixation of lower jaw with bone tissue defect using commercially produced fixator. Large defects of bone tissue are mainly caused due to the removal of bone tissue affected by tumor. These topics have been researched on the basis of the literature. Subsequently, stress strain analysis of the lower jaw with the applied fixation plate was performed. This analysis was solved by using computational modeling with variational approach, ie the finite element method. The work also describes in detail the procedure of creating model of geometry, model of material, model of boundary conditions and loads with subsequent solution of several computational models. The stress strain analysis was done for lower jaw with varying size of the removed bone tissue with applied reconstruction plate made of CP-Ti Grade 4 and for the lower jaw with the plate, which is made of -Ti-Mo. Finally, the influence of the mechanical properties of the callus during formation of new bone tissue (callus healing) on the stress and deformation of the solved system was evaluated.
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|
|
Biomechanical Studies of Facial Bone
Valášek, Jiří ; Janíček, Přemysl (referee) ; Horyl, Petr (referee) ; Florian, Zdeněk (advisor)
Presented work deals with Biomechanical study of the facial skeleton. This work is focused on the fixation of the mandible after removal of a tumor from affected bone tissue. The aim of the work is to perform biomechanical study of the facial skeleton with subsequent detailed stress strain analysis of two mandible implants designed and manufactured for specific patients. The geometry model of mandible used for design of mandible implants and used for computational modelling has been obtained on the basis of CT data of two patients. A Theoretical-Clinical sub-study that deals with the comparison the CT data processing which is necessary for creating the model of geometry is a part of the thesis. Two models of mandible with applied mandible implant have been created for two specific patients with tumorous mandible bone tissue. Stress strain analysis has been performed for these two models. Results of the stress strain analysis of two models of mandibles with mandible implants are presented in the final chapters of the thesis. Findings of the biomechanical study have been published and applied in clinical practice.
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