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Effect of location and orientation of dental implant on stress-strain states in mandibular bone
Thomková, Barbora ; Valášek, Jiří (oponent) ; Marcián, Petr (vedoucí práce)
The master’s thesis deals with issues belonging to the field of dental biomechanics, specifically the mechanical interaction of dental implants with the bone tissue of the mandible. The thesis focuses on the stress-strain analysis of the mandible with the implant inserted in different positions, with a different angle relative to the occlusal plane. The solution is performed by computational modeling using the finite element method. The geometry model of mandible was created based on CT images. The aim of the master’s thesis was also to compare the influence of the choice of the material model of cancellous bone tissue on the resulting stress-strain states of the mandible with the dental implant. Three material models of cancellous bone tissue were created - two homogeneous material model and a heterogeneous material model, which was based on CT image data. The work also investigates the effect of rotation (+5° or -5°) of implants in basic positions on the resulting stress-strain states. The stress-strain analysis showed that position and rotation has a greater effect on the stress and strain of bone tissue and implant than the chosen material model of cancellous bone tissue.
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Analysis of forces acting on the mandible during chewing
Thomková, Barbora ; Hájek, Petr (oponent) ; Marcián, Petr (vedoucí práce)
The bachelor thesis deals with cranio-maxillo-facial biomechanics by analysing the force of the lower jaw during chewing. In the thesis, research study of literary sources dealing with the force of the lower jaw is carried out, from which the information obtained was used for subsequent analysis of the force effect on the lower jaw during chewing. The solution is made referring to computational modelling, analytical methods and also numerical by using FEM. The analytical solution was made on the assumption that the lower jaw is a rigid body and solved the magnitude of the contact forces in the bonds and the bite force that was considered at different positions using equations of equilibrium. The numerical solution was computed by using the ANSYS Workbench software. Two types of kinematic bonds (spherical and fixed support) in the condyle areas were solved and compared. The first type was identical with the analytical solution. Spherical bonds were prescribed at the place of the condyles. The second type of bonds was chosen on the basis of literature. Fixed support bonds were selected in both condyles. The results were compared for both approaches related to solution and the biting forces were compared with the experimentally determined values reported by the literature.
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Prediction of mechanical properties of the cancellous bone tissue of the mandible
Holá, Lucia ; Valášek, Jiří (oponent) ; Thomková, Barbora (vedoucí práce)
The bachelor thesis deals with a problem from the field of biomechanics, specifically to determine mechanical properties of cancellous bone tissue of lower jaw and is focused on Young´s modulus of elasticity and apparent bone density detection. In this thesis a research of studies that were focused on determining a relationship between E and apparent density of trabecular bone is firstly included. Then solution is made using computational modeling using finite element method on the model of lower jaw that was constructed from CT scans. In the SolidWorks software, 12 cubes were made and inserted into the model that was later used in software called ANSYS Workbench, to calculate force reactions and E value using CT number values also calculated in the software. Calculated values of force reactions were then used for Young´s modulus calculation for each axis x,y and z using equations obtained from literature. Next solution was made using the ImageJ program in which values of Hounsfield units were obtained and later recalculated into apparent density values using mathematical relations. Then values of E as a function of CT number and E values obtained from mathematical relation were compared. Lastly the relationships between E and density were determined.
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Deformační a napěťová analýza dříků kyčelního implantátu
Čáp, Lukáš ; Thomková, Barbora (oponent) ; Marcián, Petr (vedoucí práce)
Tato bakalářská práce se zabývá deformační a napěťovou analýzou dříků totální náhrady kyčelního kloubu. Na začátku je popsána anatomie kyčelního kloubu, názvosloví jednotlivých částí implantátu a rozdělení dříků dle typu fixace v kosti, materiálu apod. Další část se věnuje normám, podle kterých se dříky vyvíjejí a vyrábějí. Součástí vývoje je i zkoušení dříků, ať už pomocí zkušebního zařízení, nebo s využitím výpočtového modelování. Pro dodané dříky je provedena deformační a napěťová analýza podle norem a studií zabývajících se touto problematikou. Tvorba geometrie dříků, nastavení okrajových podmínek a vyhodnocení výsledků analýzy je obsahem výpočtové části této práce. S těmito výsledky a jejich analýzou je možné dodané dříky mezi sebou porovnat a posoudit, který z nich je nejvíce, či naopak nejméně, staticky namáhán.
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Deformační a napěťová analýza dentálního implantátu zavedeného v geometricky odlišných mandibulách
Diakovová, Tereza ; Thomková, Barbora (oponent) ; Marcián, Petr (vedoucí práce)
Tato práce se zaobírá problematikou z oblasti dentální implantologie, a to mechanickou interakcí mezi dentálním implantátem a kostní tkání dolní čelisti. Tato interakce je ovlivněna tvarem a hustotou kostních tkání. V práci je provedena rešerše studií zabývajících se mechanickým namáháním rozhraní kostní tkáně s implantátem. Získané poznatky byly dále využity při analýze hustoty kostních tkání a při deformačně-napěťové analýze tří geometricky rozdílných čelistí se zavedeným implantátem v oblasti prvního moláru. Hustota kostních tkání byla posuzována na základě informací získaných z CT snímků jednotlivých čelistí. K posouzení deformačně-napěťových stavů bylo využito výpočtového modelování pomocí metody konečných prvků. Byly vytvořeny tři modely geometrií čelistí na základě CT snímků. Implantát byl zatížen od žvýkacích sil v okamžiku skusu. Na základě výsledků lze říci, že tvar a tloušťka kortikální kostní tkáně a hustota spongiózy mají podstatný vliv na deformačně-napěťové stavy rozhraní kost-implantát.
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Deformační a napěťová analýza dříků kyčelního implantátu
Čáp, Lukáš ; Thomková, Barbora (oponent) ; Marcián, Petr (vedoucí práce)
Tato bakalářská práce se zabývá deformační a napěťovou analýzou dříků totální náhrady kyčelního kloubu. Na začátku je popsána anatomie kyčelního kloubu, názvosloví jednotlivých částí implantátu a rozdělení dříků dle typu fixace v kosti, materiálu apod. Další část se věnuje normám, podle kterých se dříky vyvíjejí a vyrábějí. Součástí vývoje je i zkoušení dříků, ať už pomocí zkušebního zařízení, nebo s využitím výpočtového modelování. Pro dodané dříky je provedena deformační a napěťová analýza podle norem a studií zabývajících se touto problematikou. Tvorba geometrie dříků, nastavení okrajových podmínek a vyhodnocení výsledků analýzy je obsahem výpočtové části této práce. S těmito výsledky a jejich analýzou je možné dodané dříky mezi sebou porovnat a posoudit, který z nich je nejvíce, či naopak nejméně, staticky namáhán.
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Prediction of mechanical properties of the cancellous bone tissue of the mandible
Holá, Lucia ; Valášek, Jiří (oponent) ; Thomková, Barbora (vedoucí práce)
The bachelor thesis deals with a problem from the field of biomechanics, specifically to determine mechanical properties of cancellous bone tissue of lower jaw and is focused on Young´s modulus of elasticity and apparent bone density detection. In this thesis a research of studies that were focused on determining a relationship between E and apparent density of trabecular bone is firstly included. Then solution is made using computational modeling using finite element method on the model of lower jaw that was constructed from CT scans. In the SolidWorks software, 12 cubes were made and inserted into the model that was later used in software called ANSYS Workbench, to calculate force reactions and E value using CT number values also calculated in the software. Calculated values of force reactions were then used for Young´s modulus calculation for each axis x,y and z using equations obtained from literature. Next solution was made using the ImageJ program in which values of Hounsfield units were obtained and later recalculated into apparent density values using mathematical relations. Then values of E as a function of CT number and E values obtained from mathematical relation were compared. Lastly the relationships between E and density were determined.
|
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Effect of location and orientation of dental implant on stress-strain states in mandibular bone
Thomková, Barbora ; Valášek, Jiří (oponent) ; Marcián, Petr (vedoucí práce)
The master’s thesis deals with issues belonging to the field of dental biomechanics, specifically the mechanical interaction of dental implants with the bone tissue of the mandible. The thesis focuses on the stress-strain analysis of the mandible with the implant inserted in different positions, with a different angle relative to the occlusal plane. The solution is performed by computational modeling using the finite element method. The geometry model of mandible was created based on CT images. The aim of the master’s thesis was also to compare the influence of the choice of the material model of cancellous bone tissue on the resulting stress-strain states of the mandible with the dental implant. Three material models of cancellous bone tissue were created - two homogeneous material model and a heterogeneous material model, which was based on CT image data. The work also investigates the effect of rotation (+5° or -5°) of implants in basic positions on the resulting stress-strain states. The stress-strain analysis showed that position and rotation has a greater effect on the stress and strain of bone tissue and implant than the chosen material model of cancellous bone tissue.
|
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Analysis of forces acting on the mandible during chewing
Thomková, Barbora ; Hájek, Petr (oponent) ; Marcián, Petr (vedoucí práce)
The bachelor thesis deals with cranio-maxillo-facial biomechanics by analysing the force of the lower jaw during chewing. In the thesis, research study of literary sources dealing with the force of the lower jaw is carried out, from which the information obtained was used for subsequent analysis of the force effect on the lower jaw during chewing. The solution is made referring to computational modelling, analytical methods and also numerical by using FEM. The analytical solution was made on the assumption that the lower jaw is a rigid body and solved the magnitude of the contact forces in the bonds and the bite force that was considered at different positions using equations of equilibrium. The numerical solution was computed by using the ANSYS Workbench software. Two types of kinematic bonds (spherical and fixed support) in the condyle areas were solved and compared. The first type was identical with the analytical solution. Spherical bonds were prescribed at the place of the condyles. The second type of bonds was chosen on the basis of literature. Fixed support bonds were selected in both condyles. The results were compared for both approaches related to solution and the biting forces were compared with the experimentally determined values reported by the literature.
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