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Finite Element Investigation of the In - Vivo Failure of a Titanium Alloy HumanJaw Implant
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Oral and Maxillofacial Surgery.
Lund University.
Mittuniversitetet.
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2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

In order to reconstruct a patient with a bone defect in the right lower jaw, a scaffold attached to a reconstruction plate, both in a titanium alloy, was designed and manufactured using three-dimensional printing technique. Regrettably the implant fractured in situ several months after surgery. This paper is orientated to investigate the reason for the implant’s failure and provide a way of predicting the mechanical properties of the implant before surgery. Preoperative, postoperative and implant-break computed tomography data of the patient were provided by the responsible surgeon. Metallic artifacts introduced by previous dental implants were removed with metallic deletion technique software beforehand. Three-dimensional volume of the patient’s jaw was thereafter reconstructed with trabecular bone removed based on the cleaned computed tomography data. The implant, screws and jaw were assembled together and meshed with triangular elements in Mimics 16.0. The assembly was imported into in-house software with surface mesh converted to linear tetrahedral mesh. Simulations were implemented under simplified but suitable loading conditions with the assumption that jaw was a linear elastic and homogeneous material. The stress distribution on the implant plate was calculated and the location of stress concentration on the plate was determined and then verified by the clinical data of the patient. This validated model could serve in the future as a tool for optimizing the design of jaw implants.

Place, publisher, year, edition, pages
2014.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:uu:diva-234924OAI: oai:DiVA.org:uu-234924DiVA: diva2:758368
Conference
10 International Bernd-Spiessl-Symposium
Available from: 2014-10-27 Created: 2014-10-27 Last updated: 2015-01-07

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Huo, JinxingGamstedt, E. Kristofer

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