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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Biomechanics

Computational simulation of piezo-electrically stimulated bone adaption surrounding activated tooth implants

Bild zum Projekt Computational simulation of piezo-electrically stimulated bone adaption surrounding activated tooth implants

Bearbeitung:

M. Sc. Seyed Alireza Shirazi Beheshtiha, Prof. Dr.-Ing. Udo Nackenhorst

Förderung durch:

State of Lower Saxony

Kurzbeschreibung:

This study aims for the development of active implants which provide additional electrical stimulation for bone adaption. A computational framework is presented in order to optimize new developments for activating dental implants with piezoelectric coatings.

 

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A Stochastic Approach on Stress Adaptive Bone Remodeling

Bild zum Projekt A Stochastic Approach on Stress Adaptive Bone Remodeling

Bearbeitung:

Maximilian Bittens, M.Sc.; Prof. Dr.-Ing. Udo Nackenhorst

Kurzbeschreibung:

In this project the uncertainties in stress adaptive bone remodeling are addressed. Accounting for these uncertainties stochastic techniques like Polyomial Chaos Expansion or Stochastic Collocation Methods are used in order to build a stochastic response surface for evaluating the stochastic properties, e.g. sensitivity, of the system.

 

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Theoretical and algorithmic concepts for description of demand-adaptive bone growth

Bild zum Projekt Theoretical and algorithmic concepts for description of demand-adaptive bone growth

Bearbeitung:

Prof.Dr.-Ing. Udo Nackenhorst, M.Sc. Andre Lutz, ext. B.Ebbecke

Förderung durch:

This work is in cooperation with the MHH (Medizinische Hochschule Hannover)

Kurzbeschreibung:

Computational techniques for the simulation of stress-adaptive bone-remodelling have been developed and applied for the analysis of the biomechanical compatibility of hip-joint endo-prothesis. Numerical simulations are in good agreement with clinical observations and enable parameter studies for the development of optimized prosthesis designs.

 

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Image reconstruction / finite element modelling

Bild zum Projekt Image reconstruction / finite element modelling

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, M.Sc. Andre Lutz

Kurzbeschreibung:

Due to the complex structure of bone it is very difficult to get geometry data for the generation of simulation models. In addition it is impossible to get patient-specific geometry data for patient-specific treatment. With this program it is possible to extract geometry data from CT datasets and generate finite element models. Furthermore it is possible to map bone density information on the created finite element model for the purpose of calculating statically equivalent load sets.

 

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Studies on the biomechanical compatibility of hip-joint endoprostheses

 

Bearbeitung:

Prof.Dr.-Ing. Udo Nackenhorst, M.Sc. Andre Lutz, ext. B. Ebbecke

Kurzbeschreibung:

The biomechanical compatibility of different devices for artificial hip joint replacement is studied by use of computer simulation. Special emphasis is laid onto the bone remodelling caused from different prosthesis designs. Already these qualitative comparisons enables for rating the systems regarding their long term success.

 

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Finite Element Evaluation of Primary Stability of Teeth Implants

Bild zum Projekt Finite Element Evaluation of Primary Stability of Teeth Implants

Kurzbeschreibung:

Usually dental implants are loaded after the healing period which is generally 2 to 3 months after the insertion of the implant. During the healing period the patient is dependent on liquid diet. Therefore implant technologies are heading towards implants that can be loaded directly after insertion. The aim of this project is to compare the primary stability of two dental implants, one standard model and one model with a bar for rotational stabilization.

 

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Studies on bone remodelling theory based on microcracks

Bild zum Projekt Studies on bone remodelling theory based on microcracks

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, Dipl.-Ing.(FH) Dieter Kardas

Förderung durch:

This work is supported by the Research training group 615 of the DFG (German Research Foundation)

Kurzbeschreibung:

Inside the cortical section of every bone, a remodelling cycle, including the resorption and build up of bone matrix, takes place. This phenomenon lasts for the life time. Research groups nowadays agree on the theory, that bone cells called osteocytes, lying inside the bone matrix, have the function as a sensor and are responsible for the remodelling behaviour – but still there is disagreement regarding to what is stimulating the cells.

 

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Finite Element Analysis of the Fracture Healing Process

Bild zum Projekt Finite Element Analysis of the Fracture Healing Process

Bearbeitung:

Prof. Dr.-Ing. U. Nackenhorst, M.Sc. Alexander Sapotnick

Förderung durch:

This project is funded by the DFG (German Research Foundation) NA-330/8-1

 

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Finite Element Simulation of Osseointegration of Uncemented Endoprostheses

Bild zum Projekt Finite Element Simulation of Osseointegration of Uncemented Endoprostheses

Bearbeitung:

Prof. Dr.-Ing. U. Nackenhorst, M.Sc. André Lutz

Kurzbeschreibung:

The term osseointegration means the ingrowth of bone into a porous coated implant. In order to simulate the osseointegration of bone implants, a bio-active interface theory is necessary.

 

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An efficient approach for modeling hip joint contact

Bild zum Projekt An efficient approach for modeling hip joint contact

Bearbeitung:

M.Sc. Kristin Fietz, Prof. Dr.-Ing Undo Nackenhorst

Förderung durch:

This research is supported by the German Research Foundation under Grant NA 330/6-1.

Kurzbeschreibung:

In developed countries osteoarthritis is the major cause for artificial joint replacement. Unfortunately, the formation processes of this degeneration of cartilage and subchondral bone remain partly unknown. In this research project a three dimensional finite element model of the hip joint is developed in order to investigate the fluid cartilage contact under physiological loading conditions.

 

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Finite Element Analysis of Hip Joint Contact

Bild zum Projekt Finite Element Analysis of Hip Joint Contact

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, M.Sc. Kristin Fietz, M.Sc. Andre Lutz

Kurzbeschreibung:

Diseases and injuries of the human muscosceletal system are of particular importance in the health care systems worldwide. The overall costs in Germany including loss of production are estimated up to 100 billion Euros every year.

 

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Bone Cell Simulations using Tensegrity Structures

Bild zum Projekt Bone Cell Simulations using Tensegrity Structures

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, Dipl.-Ing. (FH) Dieter Kardas, ext. IIya Arsenyev, Oleg Khromov

Kurzbeschreibung:

Bone quality detoriates with time, therefore it has to renew itself throughout the life. This process is called bone remodeling. It is well accepted, that osteocytes are the sensor cells for this process.

 

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FE-Analysis of Osteons concerning the Mechanosensation of Bone Material

 

Bearbeitung:

ext. C.Lenz

Förderung durch:

This work is supported by the Graduiertenkolleg 615 of the DFG (German Research Foundation)

Kurzbeschreibung:

The aim of this project is to localize the detection mechanism of external loads in bone tissue and simulate the formation of new osteons.

 

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