frequency and pattern of idiopathic osteosclerosis and condensing osteitis lesions in panoramic radiography of iranian patients

background: the purpose of this study was to investigate of radiographic pattern and relative frequency of idiopathic osteosclerosis (io) and condensing osteitis (co) in panoramic radiographs. materials and methods: totally 411 panoramic radiographies were randomly selected from patients referred to radiology department of faculty of dentistry, tabriz university of medical sciences. descriptive characteristics of radiopacities, including shape, border, localization, and dental relationship, were recorded. the chi‑squared test was used. results: io was detected in 31 (7.5%) patients and 22 (68.8%) lesions had exact border while their shape was mostly irregular. about 17 (53.1%) lesions were apical, and 13 (40.6%) lesions had no relation to the teeth. the most involved teeth were the second premolar (28.1%) and first molar (25%). moreover, co was detected in 32 (7.8%) patients. 17 (53.1%) lesions had an ill‑defined border, and their shape was mostly irregular (65.6%) with ill‑defined border. around 18 (56.3%) lesions were apical, and 11 (34.4) lesions were apical and interradicular. the most involved teeth were the second premolar (59.4%) and the first molar (21.9%). conclusion: the results demonstrated that relative frequency of io in the selected population was 7.5% and for co, it was 7.8%. key words: condensing osteitis, frequency, idiopathic osteosclero