Public defence in Polymer Technology, M.Sc. (Tech.) Kasper Dienel

Public defence from the School of Chemical Engineering, Department of Chemical and Metallurgical Engineering
Doctoral hat floating above a speaker's podium with a microphone

Title of the thesis: Bioactive Patient-Specific Implants for Regeneration of Critical Size Bone Defects

Doctoral student: M.Sc. (Tech.) Kasper Dienel
Opponent: Professor Anna Finne-Wistrand, KTH Royal Institute of Technology, Sweden
Custos: Professor Jukka Seppälä, Aalto University School of Chemical Engineering

Materials for 3D Printing Personalized Bone Implants

Imagine needing to have your jaw replaced. Injury or diseases such as cancer can lead to a bone defect, a lack of bone where it should normally exist. Bone possesses the ability to spontaneously heal itself, however, if volume of the bone defect is substantial the body needs help to effectively heal. In such cases bone harvested for example from the hip of the patient can be used to fill the defect and assist the healing. Nevertheless, this method is limited considering for example the amount of native bone available. Therefore, synthetic bioactive materials resembling native bone can provide an alternative approach. Synthetic materials possess the advantage, that they can be engineered to have exactly the desired physico-chemical characteristics while being adaptable to fit the patient perfectly.
This thesis studied composite materials for 3D printing of so-called patient-specific bone implants for healing large bone defects. Such implants are manufactured individually for the patient according to their anatomy based on computer imaging. Reconstruction of the lower jaw was chosen as case example. Of the four publications included in the work, three focus on the material development, upscaling and finally biological testing of one material and implants thereof. The encouraging results showed that the implants provide a surface upon implantation that stimulates bone growth within the bone defect. These results were confirmed in a large animal study, but the materials were also associated with an elevated incidence of infection.
This thesis showed successful technical implementation of a complete production workflow from materials synthesis and materials characterization to manufacturing of large patient-specific bone reconstruction implants. At the same time the thesis highlights the challenge of product design from lab to clinic, while bringing substantial knowledge to the field about the studied materials and components.

Thesis available for public display 10 days prior to the defenceYhteystiedot:
M.Sc. (Tech.) Kasper Dienel
[email protected] 

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