Considering that FT was present in 11.75% of patients, radiologists and clinicians should be aware of the possible presence of this defect. It is known that this developmental dehiscence may cause herniation of temporomandibular joint, formation of salivary otorrhea, and spread of tumour or infection to the infratemporal fossa from external auditory canal. This study showed that CBCT may be preferred for imaging these conditions. (Folia Morphol 2018; 77, 2: 335-339).

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Objectives: This study aimed to compare the diagnostic accuracy of cone beam CT (CBCT) units with different voxel sizes with the digital intraoral scanning technique in terms of the detection of periodontal defects. Methods and materials: The study material comprised of 12 dry skulls with maxilla and mandible. Artificial defects were created on teeth separately using burs randomly on dry skulls. In total 46 dehiscences, 10 fenestrations, 17 furcations, 12 wall defects and 13 without periodontal defect were used in the study. Each tooth with and without defects was imaged at various vertical angles using each of the following modalities: a Veraviewepocs 3D R100 CBCT device and a 3D Shape TRIOSㄾ Color P13 Shade Intraoral Scanner. Results: The κ values for interobserver agreement between observers ranged between 0.29 and 0.86 for the CBCT 10 × 8 cm field of view (FOV) with 0,160 mm3 voxel size; 0.35 and 1 for the CBCT 8 × 8 cm FOV with 0,125 mm3 voxel size; and 0.30 and 1 of intraoral scans. The κ values for detecting defects on anterior teeth were the least, following premolar and molar teeth both CBCT and intraoral scanning. Conclusions: Smaller voxel sizes and smaller CBCT FOV has the highest sensitivity and diagnostic accuracy for detecting various periodontal defects among the scanner modalities examined. Advances in knowledge: Adequate evaluation of the condition of the alveolar bone and periodontal tissues is important for the diagnosis, treatment, and prognosis of periodontal disease. Limited examination methods, such as palpation, inspection, and periodontal probe examination, may provide insufficient information for the diagnosis of periodontal diseases.

Background and Aim: The aim of our study is to prepare a head–neck phantom model for ultrasound suitable for submandibular anatomy to be used in the education of research assistants in the department of radiology in dentistry, and to compare different materials for this purpose. Materials and Methods: To make the planned phantom model, we used aluminum foil suitable for the curvature of the mandible instead of bone, pasta, or parsley stalk and balloon/glove to mimic the myofascial structure instead of muscles, tube of an infusion system instead of blood vessels, ketchup/mayonnaise/honey instead of gland structures (in a small balloon), and small balloons filled with water or mayonnaise with a tube of an infusion system or pipette instead of lymph nodes. Results: After the examinations, it was decided to put ballistic gel for soft tissue, aluminum foil for bone, spaghetti and ketchup in a balloon for muscle, mayonnaise in small balloons for lymph nodes, ketchup in a balloon for submandibular gland, and a tube of an infusion system for the artery. Conclusion: The submandibular region phantom can be a useful tool for learning the sonoanatomy of the head, neck, and submandibular region and improving the ability to use ultrasound. The advantage of the prepared model is that it is easy to use, prepare and apply materials accessible to any dentist, and can be used over and over again.

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