Abstract
Correlation Between Tissue Densities in Computed Tomography and Three Different Cone-Beam Computed Tomography Units (In Vitro)
Highlights
Assessment of the mechanical properties of the implant recipient bone is one of the concerns among dentists, which can significantly affect the osseointegration process and the primary stability of the implant.[1,2,3]and by 80% in developing countries by 2025.(2) One of the most important assessment indices is bone density, which is of great assistance in the selection of the properimplant site.[4]. Armstrong, in 2006, stated that the Hounsfield Unit (HU) and the grayscale of a single point are not equal.[5]. Katsumata et al declared that grayscale values obtained by the use of cone-beam computed tomography (CBCT) are reliable.[6]. Mah et al stated that the differences between grayscale and HU are insignificant. [7]
Emadi et al stated that CBCT grayscale and CT HU are dissimilar and showed that the densities obtained by two different CBCT units are dissimilar.[21] the results of the present study showed a strong correlation between aluminum and cortical bone densities obtained by NewTom VGi and Rotograph Evo 3D CBCT units
The results of the present study indicate that the densities obtained by the CBCT units show higher numbers than CT HU in similar tissues
Summary
Assessment of the mechanical properties of the implant recipient bone is one of the concerns among dentists, which can significantly affect the osseointegration process and the primary stability of the implant.[1,2,3]and by 80% in developing countries by 2025.(2) One of the most important assessment indices is bone density, which is of great assistance in the selection of the properimplant site.[4]. [9,10,11,12] recent studies have proven that CBCT’s effective dose is variable and can be affected by factors such as device type, the field of view (FOV), the number of base projections, and scan mode.[13] CBCT is the modality of choice for bone assessment before implant placement with approved accuracy of linear measurements and accurate assessment of adjacent anatomy.[14] But disadvantages such as beam hardening artifact, high radiation scatter, and inability to render actual HU values are among the limitations of CBCT.[9,10,15,16] CBCT has the potential to assess bone density, and overall, grayscale can be used for bone density assessment.[17,18,19] the bone density obtained by the grayscale in CBCT has not yet been calibrated to conform to HU in CT; their correlation is indefinite.[20] The present in-vitro study aimed to assess the correlation between tissue densities in CT and three different CBCT units at the Oral and Maxillofacial Radiology Department of the Dental Faculty of Islamic Azad University of Medical Sciences, Tehran, Iran, during 2014-2015
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