Direct estimation of human trabecular bone stiffness using cone-beam computed tomography

Publication date: Available online 10 April 2018
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Eva Klintström, Benjamin Klintström, Dieter Pahr, Torkel Brismar, Örjan Smedby, Rodrigo Moreno
ObjectivesThe aim of this study was to evaluate the possibility of estimating biomechanical properties of trabecular bone through finite element (FE) simulations using dental cone beam computed tomography (CBCT) data.Study designFourteen human radius specimens were scanned in three CBCT devices: 3D Accuitomo 80, NewTom 5G, and Verity. The imaging data was segmented using two different methods. Stiffness (Young's modulus), shear moduli, and the size and shape of the stiffness tensor were studied. Corresponding evaluations using micro-CT were regarded as the reference standard.ResultsThe 3D Accuitomo 80 showed good performance in estimating stiffness and shear moduli, but was sensitive to the choice of segmentation method. NewTom 5G and Verity yielded good correlations, but they were not as strong as the Accuitomo. The CBCT devices overestimated both stiffness and shear compared to the micro-CT estimations.ConclusionsFE-based calculations of biomechanics from CBCT data are feasible, with strong correlations for the Accuitomo 80 scanner combined with an appropriate segmentation method. Such measurements might be useful for predicting implant survival by in vivo estimations of bone properties.



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