ECTS2013 Poster Presentations Bone biomechanics and quality (28 abstracts)
Microstructural adaptation of bone tissue of the facial skeleton to the distribution of occlusal load under physiological conditions
Aleksa Janovic 1, , Petar Milovanovic 2 , Igor Saveljic 3 , Dalibor Nikolic 3 , Michael Hahn 4 , Bjoern Busse 4 , Zoran Rakocevic 1 , Nenad Filipovic 3 , Michael Amling 4 & Marija Djuric 2
1Department of Radiology, School of Dentistry, University of Belgrade, 11 000 Belgrade, Serbia; 2Laboratory for Anthropology, Department of Anatomy, School of Medicine, University of Belgrade, 11 000 Belgrade, Serbia; 3Bioengineering Research and Development Center (BioIRC), Faculty of Engineering, University of Kragujevac, 34 000 Kragujevac, Serbia; 4Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, D-22529 Hamburg, Germany.
Despite widely accepted classical mechanical theory of buttresses as a load bearing areas in the midfacial skeleton, the data related to its microstructural adaptation on functional demands are scarce. In this study we investigated microstructural features of the different regions in the facial bones in relation to the occlusal load dissipation using a combination of finite element analysis (FEA) and micro-CT analysis (μCT). The FEA was performed on the model of the dry human skull in order to show stress distribution through the midfacial bones during biting. The same skull was used as a source of bone specimens. Cortical (n=25) and cancellous (n=12) bone specimens were detached from the sites of the maxilla and the zygomatic bone, which suffered different stress during FEA. Bone sections were scanned using Scanco Medical μCT 40. Finite element analysis showed an uneven stress distribution through the facial skeleton with the highest stress along the buttresses. There were also differences in the microarchitecture of cortical and cancellous bone between the regions subjected to different stress. Cortical bone was found to be thicker, denser, less porous, and with a greater pore diameter in the regions where high stress was noted on FEA. Regions of the midfacial skeleton with different loading history also showed differences in cancellous bone microarchitecture. Trabecular thickness, number of trabeculae, and density of bone volume were higher in the regions subjected to high stress, while at the same sites trabeculaes were less interconnected and more separated. The midfacial bones exhibit regional differences in cortical and cancellous bone microarchitecture that could be a consequence of different functional demands under physiological conditions.
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Bone Abstracts
ISSN 2052-1219 (online)
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