Author/Authors :
Gholinia, Faegheh Department of Orthodontics - School of Dentistry - Dental Sciences Research Center - Guilan University of Medical Sciences, Rasht, Iran , Pourgholi, Mahsa School of Dentistry - Guilan University of Medical Sciences, Rasht, Iran
Abstract :
Introduction: Due to the important role of imaging in the diagnosis and treatment plan in orthodontics, CBCT (Cone Beam Computed Tomography)
images because of their three-dimensional nature,
can minimize the disadvantages of two-dimensional
images such as magnification, distortion, or superimposition
Materials and methods: In the first part, the
distances between the 14 anatomical landmarks on
the 5 dried human skulls (reference models) identified by metal spheres were measured by a digital
caliper. In the next step, CBCT images were scanned
from the same reference models. In the second part,
radiographic images were taken from 26 patients enrolled according to inclusion and exclusion criteria in
three stages, scanning CBCT images, digital LC (Lateral
Cephalometric) images from the same CBCT images,
manual tracing of digital LC images. Finally, using the
obtained data, the accuracy of measurements performed directly on the reference models with CBCT
images as well as the CBCT images, digital LC and
traced digital LC images of the patients were evaluated together.
Results: The mean of direct measurements on the
reference models was not significantly different from
the measured values on CBCT images (ρ-value> 0.05).
In other words, the measurement of the CBCT images
was the same as the reference models. Also, in most
cases, linear measurements between the traced LC
image with digital LC images and the CBCT of patients
were different (ρ-value > 0.05). Meaning traced LC images and digital LC in 8 cases, CBCT and digital LC in 4
cases and finally traced digital LC and CBCT in 5 cases
were different.
Conclusion: The present study showed that the
accuracy of CBCT image measurements was similar
to the direct measurements obtained from the reference models. Also, the accuracy of linear measurements of CBCT images is higher and more reliable
than that of digital LC images as well as traced digital
LC images.
