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.

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Objectives: This study aimed to analyze any relationship between the articular eminence inclination, height and shape and degenerative condylar changes using cone-beam computed tomography (CBCT). Materials and Methods:The assessments were established on CBCT images of 566 temporomandibular joints (TMJ) that were included from the archive. Age and sex were recorded for all individuals. Degenerative changes were examined on the articular surface of the condyle. The articular eminence (AE) inclination and height measurements were performed on central parasagittal slices of the TMJs. The shape of the AE was classified as box-shaped, sigmoid, flattened, and deformed. Results:The prevalence of degenerative changes in the condyle was higher in males, but no significant difference was found (p˃0.05). Mean AE inclination and height were greater in males than females (p<0.05). Reduced mean eminence inclination and height values were detected in the +50-year-old group (p<0.05). Sigmoid and box-shaped articular eminence morphologies were more common. The eminence with a deformed shape was related to two or more degenerative alterations in the condylar head. Conclusion:The eminence inclination and height are associated with the presence and types of degenerative condylar changes. There are significant relationships between sex-AE morphology and age-AE morphology.

Apikal patolojiler, %90'dan fazlası apikal apse, apikal granülom ve apikal kist olarak sınıflandırılan enflamatuar lezyonlar olup enflamatuar bir süreç olarak apikal periodontitis ile başlarlar. 1,2 Apikal periodontitis, esas olarak endodontik sistemin bakteriyel enfeksiyonu ve periapikal kemik dokusunun buna bağlı verdiği yanıtı içeren enflamatuar bir süreçtir. 3,4,5 Apikal periodontitiste oluşan kemik yıkımı hem mikrobiyal enfeksiyon hem de savunma mekanizmasının bir sonucudur. 3,4,5 ve çenelerde dişlere bağlı en sık görülen enflamatuar lezyondur. 6 Kemik yıkımı radyografilerde rarefiye osteit olarak adlandırılan radyolüsent bir görüntü oluşturur. 1 Apikal lezyonların tespitinde en sık periapikal ve panoramik radyografiler kullanılırken 7 asemptomatik lezyonlar genelde radyografilerde tesadüfi olarak tespit edilir. 8 Panoramik radyografiler, apikal lezyonların tespitinde sınırlı hassasiyet ve NPV göstermesine rağmen, spesifikliği, PPV'si ve genel olarak iyi bir tanısal ayırt etme kabiliyeti ile sıklıkla tercih edilmektedir. Bu nedenle, apikal patolojileri panoramik radyografilerde tespit etmek diş hekimleri için rutin bir hale gelmiştir. 9 Radyoloji pratiğinde, tıbbi görüntüler radyologlar tarafından kısa sürede kapsamlı bir şekilde analiz edilip, değerlendirilmektedir.

Purpose: Determining the anatomical localization and variations of the mandibular canal is of great importance in determining the treatment method to be preferred during the treatment of the patient and having an idea before surgery for possible complications. In this study, it was aimed to evaluate the anatomy and variations of the mandibular canal using Cone Beam Computed Tomography(CBCT). Materials&amp;Methods: CBCT images obtained from 300 jaws of 300 patients, 168 of whom were female and 132 male, were used. The examined mandibular canals were divided into four groups as retromolar, anterior canal, dental and buccolingual canals. Statistical analysis of the data was performed using descriptive statistics and chi-square tests. Results: Bifid duct was detected in 149(49.2%) of the patients, but trifid duct was not detected. 73 (48.99%) of bifid canals were detected on the right and 76 (50.01%) on the left. Considering the relationship between age and gender and the presence of mandibular canal variation, no statistically significant result was found according to the chi-square test.When the right-left distribution of the channel variations evaluated in the study was examined, no statistically significant relationship was observed.(p&gt;0.005)(p=0.688) Conclusion: The prevalence of variation in the examined mandibular canals was found to be 49.66%. Anterior canal(35.6%) was most common, followed by retromolar canal(28.2%), dental canal(25.6%) and buccolingual canal(10.7%). According to the results obtained, the possibility of approximately 50 percent mandibular canal variation should be considered in prosthetic and surgical treatment interventions planned in the relevant regions.