Author/Authors :
Haghani Jahangir نويسنده Kerman Oral and Dental Diseases Research Center, Kerman University of Medical Sciences, Kerman, Iran , Moshfeghi Mahkameh نويسنده Assistant Professor, Department of Oral and Maxillofacial Radiology, School of Dentistry, Shahid Beheshti University of Medical Sciences. Tehran, Ira , Safi Yaser نويسنده Department of Oral and Maxillofacial Radiology, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran , Vasegh Zahra نويسنده Department of Oral and Maxillofacial Radiology, School of
Dentistry, Shahid Beheshti University of Medical Sciences, Tehran,
Iran , Aghdasi Mohamad Mehdi نويسنده Department of Oral and Maxillofacial Radiology, School of
Dentistry, Shahid Beheshti University of Medical Sciences, Tehran,
Iran , Afsahi Mahmoud نويسنده Kerman University of Medical Sciences, Kerman,
Iran
Abstract :
Objectives Artifacts from various dental materials are a
disturbing factor which reduces the quality of images obtained from cone
beam computed tomography (CBCT). This study aimed to evaluate the effect
of tube current on dental material artifacts in CBCT imaging. To assess
the amount of artifacts, signal difference to noise ratio indicator was
used. Materials and Methods In this study, twenty widely-used dental
materials were used. The samples were scanned with Soredex SCANORA 3D at
two different tube current of 5 and 10 mA while all other conditions
remained constant. Using the On-Demand 3D Application software, the
circular areas were selected as the region of interest (ROI) at 1, 2 and
4 mm from the edge of the object’s image. In each of these ROI areas,
information about mean gray value was obtained and signal difference to
noise ratio (SDNR) was calculated. Data regarding two scanning
conditions were compared using the Wilcoxon statistical analysis.
Results Regardless of the type of material at 5 mA, SDNR at distances of
1, 2 and 4 mm were +3.6797, -1.2901, and -2.8608, respectively. SDNR at
10 mA scanning at a distance of 1, 2 and 4 mm were +3.2363, -1.1889, and
-1.1844, respectively. SDNR for all materials at 5 and 10 mA scanning
condition were -0.1570, and +0.2877, respectively and according to the
Wilcoxon test there was significant difference (P value = 0.026).
Conclusions By varying tube current from 5 to 10 mA, SDNR index, and
regardless of the type of material, the distance and direction
increased. This increase reflects the reduction of artifacts from
various dental materials following increase in tube current.
