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Imaging Sci Dent. 2014 Dec;44(4):257-262. English. Original Article. https://doi.org/10.5624/isd.2014.44.4.257
Nikneshan S , Aval SH , Bakhshalian N , Shahab S , Mohammadpour M , Sarikhani S .
Department of Dental and Maxillofacial Radiology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Department of Advanced Periodontology, School of Dentistry, University of Southern California, Los Angeles, USA.
Department of Dental and Maxillofacial Radiology, School of Dentistry, Shahed University of Medical Sciences, Tehran, Iran.
Department of Dental and Maxillofacial Radiology, School of Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran.
Department of Dental and Maxillofacial Radiology, School of Dentistry, Golestan University of Medical Sciences, Golestan, Iran. e_soodeh@yahoo.com
Abstract

PURPOSE: This study was performed to evaluate the effect of changing the orientation of a reconstructed image on the accuracy of linear measurements using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: Forty-two titanium pins were inserted in seven dry sheep mandibles. The length of these pins was measured using a digital caliper with readability of 0.01 mm. Mandibles were radiographed using a CBCT device. When the CBCT images were reconstructed, the orientation of slices was adjusted to parallel (i.e., 0degrees), +10degrees, +12degrees, -12degrees, and -10degrees with respect to the occlusal plane. The length of the pins was measured by three radiologists, and the accuracy of these measurements was reported using descriptive statistics and one-way analysis of variance (ANOVA); p<0.05 was considered statistically significant. RESULTS: The differences in radiographic measurements ranged from -0.64 to +0.06 at the orientation of -12degrees, -0.66 to -0.11 at -10degrees, -0.51 to +0.19 at 0degrees, -0.64 to +0.08 at +10degrees, and -0.64 to +0.1 at +12degrees. The mean absolute values of the errors were greater at negative orientations than at the parallel position or at positive orientations. The observers underestimated most of the variables by 0.5-0.1 mm (83.6%). In the second set of observations, the reproducibility at all orientations was greater than 0.9. CONCLUSION: Changing the slice orientation in the range of -12degrees to +12degrees reduced the accuracy of linear measurements obtained using CBCT. However, the error value was smaller than 0.5 mm and was, therefore, clinically acceptable.

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