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Prediction of mechanical properties of the cancellous bone tissue of the mandible
Holá, Lucia ; Valášek, Jiří (referee) ; Thomková, Barbora (advisor)
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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Prediction of mechanical properties of the cancellous bone tissue of the mandible
Holá, Lucia ; Valášek, Jiří (referee) ; Thomková, Barbora (advisor)
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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Development of testing equipment for measuring mechanical properties of cancellous bone
Jiroušek, Ondřej ; Jírová, Jitka ; Vavřík, Daniel
Development of experimental procedures used for evaluation of mechanical properties of cancellous bone using small samples of cylindrical shape. Both the compressive and tensile specimens are tested while for the strain measurement an optical method utilizing CCD camera of high resolution is used. The procedure is used to assess the relationship between the apparent density of the cancellous bone in Hounsfield units obtained from computer tomography scans and viscoelastic material properties used in finite element modeling of whole bones.
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Vztah mezi materiálovými vlastnosti spongiózní kosti a její relativní hustotou stanovený pomocí malých vzorků a optické metody
Jiroušek, Ondřej
Experimental procedures utilizing an optical identification method used for evaluation of mechanical properties of cancellous bone using small samples of cylindrical shape are described in the paper. To measure very small strains of the cancellous bone, high-resolution CCD-camera and algorithm making use of sub-pixel determination of the centre-of-gravity of the markers are used. The experimental procedures serve for consequent evaluation of the relationship between apparent density and Young\'s modulus of elasticity and ultimate strength of the cancellous bone
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Experimentální vyšetřování závislosti mezi mechanickými vlastnostmi spongiózní kosti a její relativní hustotou
Jiroušek, Ondřej ; Jírová, Jitka ; Jíra, J.
Finite element models of parts of human skeletal system are nowadays constructed on basis of data obtained from Computed Tomography or Magnetic Resonance images. Material properties of cancellous bone have been found to be strongly dependent on apparent density of the tissue. Experimental procedures used for evaluation of mechanical properties of cancellous bone using small samples of cylindrical shape will be described and relationship between the apparent density and Young's modulus of elasticity as well as ultimate strength are proposed. Compressive and tensile specimens are used while for the strains are measured using an optical method utilizing CCD camera of high resolution
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