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Introduction: The term of idiopatic osteosclerosis (I.O) have been used to describe a localised area of radiopacity of unknown origin. The condition is usually asymptomatic and discovered on a radiograph taken for other reason. The radiopacity is variable in size, shape, outline and density. The purpose of this investigation was to determine the frequncy, age and sex distribution and anatomic location of I.O and its relation to history of extraction of decidious teeth. Materials and Methods: Standard panoramic radiographs of 917 patients(494 female & 423 male) were examined at the Department of oral and maxillofacial radiology, Yazd dental college and private clinic. The age, sex as well as the anatomic location of I.O is outlined I.O mass were observed in patients. The radiographs was studies carefully by oral radiologist and sclerosis mass place was marked then clinical examination was done. Results: In total 54 sclerosis mass in 52 mandibuls were observed According to the location of lesions premolars of lower jaws was higher than other (59.6% in female & 40.4% in male P=0.392). Most of cases were occurred in 3rd & forth decade of life (P=0.018). The most prevalence areas were premolar/ molar/ between firstmolar second premolar/ between canin & first premolar. Conclusion: According to the our finding that the most prevalence was belogned to sclerotic mass that was not related to the root, the developing theory in a cause of mass that seems to be accepted.

Keywords: Osteosclerosis, Panoramic radiography, Mandibule

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