Accuracy assessment of three-dimensional surface reconstructions of teeth from cone beam computed tomography scans
Journal of Oral Rehabilitation
Faculty of Dentistry (ACTA)
The use of three-dimensional (3D) models of the dentition obtained from cone beam computed tomography (CBCT) is becoming increasingly
more popular in dentistry. A recent trend is to replace the traditional dental casts with digital CBCT models for diagnosis,
treatment planning and simulation. The accuracy of these models was previously assessed through comparing linear physical
and radiographical measurements. However, this assessment technique is both observer and landmark dependent. The accuracy
of 3D CBCT teeth reconstructions is yet to be reliably measured. To assess the accuracy of 3D CBCT reconstructions of the
teeth using a semi-automated and observer-independent method and to assess the influence of field of view (FoV) selection
on reconstruction accuracy. Fully dentate upper and lower dry human jaws, placed in a plastic box and immersed in water, were
scanned using CBCT with small, medium and large FoV. The teeth were then scanned separately using MicroCT. Cone beam computed
tomography and MicroCT 3D teeth models were compared, and mean surface difference was calculated per tooth for each FoV. Mean
and (maximum) differences between MicroCT and CBCT were 120 ± 40 (max. 679) μm, 157 ± 39 (max. 824) μ and 207 ± 80 (max. 862)
μm for the small, medium and large FoV, respectively. Cone beam computed tomography models were larger than MicroCT because
of larger voxel size. Our results indicate that CBCT may provide accurate 3D reconstructions of the teeth that can be useful
for some clinical applications.
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