Accuracy of alveolar bone measurements from cone beam computed tomography acquired using varying settings

Structured Abstract ObjectivesTo investigate the accuracy and reliability of cone beam computed tomography (CBCT) measurements of buccal alveolar bone height (BBH) and thickness (BBT) using custom acquisition settings. Settings and Sample PopulationSchool of Dentistry, Oregon Health & Science University. Twelve embalmed cadavers. Materials and MethodsCadaver heads were imaged by CBCT (i-CAT((R)) 17-19, Imaging Sciences International, Hatfield, PA) using a long scan' (LS) setting with 619 projection images, 360 degrees revolution, 26.9s duration, and 0.2mm voxel size, and using a short scan' (SS) setting with 169 projection images, 180 degrees rotation, 4.8s duration, and 0.3mm voxel size. BBH and BBT were measured with 65 teeth, indirectly from CBCT images and directly through dissection. Comparisons were assessed using paired t-tests (p0.05). Level of agreement was assessed by concordance correlation coefficients, Pearson's correlation coefficients, and Bland-Altman plots. ResultsMean differences in measurements compared to direct measurements were as follows, LS 0.170.12 (BBH) and 0.10 +/- 0.07mm (BBT), and SS 0.41 +/- 0.32 (BBH) and 0.12 +/- 0.11mm (BBT). No statistical differences were found with any of BBH or BBT measurements. Correlation coefficients and Bland-Altman plots showed agreement was high between direct and indirect measurement methods, although agreement was stronger for measurements of BBH than BBT. ConclusionsCompared to the LS, the similarity in results with the reduced scan times and hence reduced effective radiation dose, favors use of shorter scans, unless other purposes for higher resolution imaging can be defined.