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

Area of Science:

• Biomechanical Engineering
• Dental Imaging
• Materials Science

Background:

• Trabecular bone biomechanical properties are crucial for predicting implant success.
• Finite element analysis (FEA) is a powerful tool for biomechanical evaluation.
• Dental cone beam computed tomography (CBCT) offers a non-invasive method for imaging bone structure.

Purpose of the Study:

• To assess the feasibility of estimating trabecular bone biomechanical properties using FEA with CBCT data.
• To compare the performance of different CBCT devices and segmentation methods for biomechanical property estimation.

Main Methods:

• Human radius specimens were scanned using three CBCT devices (Accuitomo 80, NewTom 5 G, Verity).
• Imaging data were processed using two segmentation methods.
• Biomechanical properties (stiffness, shear moduli, stiffness tensor) were calculated via FEA.
• Micro-computed tomography (micro-CT) served as the reference standard.

Main Results:

• The Accuitomo 80 demonstrated good performance in estimating stiffness and shear moduli, though sensitive to segmentation.
• NewTom 5 G and Verity showed good correlations but were less accurate than Accuitomo 80.
• All CBCT devices tended to overestimate stiffness and shear moduli compared to micro-CT.

Conclusions:

• FEA-based biomechanical calculations from CBCT data are feasible.
• The Accuitomo 80, with appropriate segmentation, provides strong correlations for bone property estimation.
• These estimations may aid in predicting implant survival through in vivo bone property assessment.