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    ASSESSMENT OF STAFNE BONE DEFECTS PREVALENCE AND CHARACTERISTICS BY USING CONE BEAM COMPUTED TOMOGRAPHY: A RETROSPECTIVE STUDY
    (Kırıkkale Üniversitesi, 2017) Demiralp, Kemal Özgür; Bayrak, Seval; Kurşun Çakmak, Emine Sebnem
    Objective: Stafne bone defects (SBDs) are asymptomatic radiolucent cavities usually located between mandibular angle and the third molar, below the inferior alveolar canal and above the basis of the mandible. The aim of this retrospective study is to estimate the frequency, age and sex distrubution and types of SBDs from Cone Beam Computed Tomography (CBCT) images of 169 subjects.Material and Methods: CBCT images between the years 2014 and 2016 were obtained in Bolu İzzet Baysal University, Dentistry Faculty by using I-CAT 3D Imaging System from 169 subjects and analysed by one observer by utilizing axial, sagittal, cross-sectional, panoramic images and 3D reconstructions.Results: Results of this study showed that SBDs frequency was 3.5% with the mean age of 51. Detected SBDs patients were all male. All cases were asymptomatic and unilateral.Conclusion: Although the radiological appearance of the SBDs is usually pathognomonic, in indeterminate cases 3 dimensional examination as CBCT is recommended.
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    Comparison of radiopacity of current restorative CAD/CAM blocks with digital radiography
    (Wiley, 2019) Atala, Mustafa H.; Atala, Nagehan; Yegin, Elif; Bayrak, Seval
    Objective While the radiopacity of restorative material affects the radiographic diagnosis of the teeth, there is no data about the radiopacity of current restorative computer-aided design (CAD)/computer-aided manufacturing (CAM) materials. Therefore, the present study compared the radiopacity values of current restorative CAD/CAM blocks to facilitate the material choice within such a wide variety of materials. Materials and Methods Specimens were prepared from 13 different restorative CAD/CAM blocks to compare with enamel and dentin. The specimens placed on the occlusal phosphor plate were imaged with aluminum step wedge and tooth section. The radiopacity values were calculated using the Image J program. The radiopacity values of the specimens were converted to mmAl values with the Curve Expert 1.4 program. Results The difference between the radiopacity values of dentin and e.max CAD was not significant, however, they exhibited a significant difference from the other 14 groups (P < .05). Enamel and Obsidien, Suprinity, and Celtra Duo had greater radiopacity values with significant differences from the other 12 materials whereas the difference within these groups was not significant (P > .05). Conclusions The evaluated restorative CAD/CAM materials have significantly different radiopacity values. Among these permanent restoration blocks, the highest radiopacity value was observed in Celtra Duo, the lowest in Block HC.