Cone-beam computed tomography: accuracy of three-dimensional cephalometry analysis and influence of patient scanning position.
The aim of this research was to analyze the influence of the position of the skull during cone-beam computed tomography (CBCT) scan and if the three-dimensional cephalometric measurements are influenced by skull orientation during CBCT scan.The study consisted of 5 CBCT scanning (KODAK 9500 Cone Beam 3D System unit) in 5 different positions of a dry skull. The data were imported in SIMPLANT OMS Software version 13.0. Fifteen three-dimensional cephalometric measurements were calculated; moreover, the mean, the SD, the maximum/minimum Δ, and the maximum/minimum Δ percentage were calculated. The statistical analysis was performed by an independent-samples t-test to evaluate differences between the 5 scans.No difference was found in all the three-dimensional analysis. Twelve of 15 measurements have a Δ greater than 1.5, and 7 of 15 measurements have a Δ greater than 2. Nine of 15 have a Δ percentage greater than 5%. The preliminary results suggest that the three-dimensional cephalometric analysis is influenced by patient scanning position.
Department of Orthodontics and Gnathology-Masticatory Function, University of Turin, TurinYDental School, Torino, Italy. gianluigi_frongia@msn.com
Gianluigi
G
Frongia
Maria Grazia
MG
Piancino
Pietro
P
Bracco
D002508:Cephalometry / Q000379:methods*; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D066298:In Vitro Techniques; D056888:Patient Positioning; D011857:Radiographic Image Interpretation, Computer-Assisted; D015203:Reproducibility of Results; D012886:Skull / Q000000981:diagnostic imaging*