Abstract: PURPOSE: A retrospective research was made to evaluate the clinical characteristics, imaging features , treatment results of patients with osseous dysplasia(OD) of the jaws. METHODS: Thirty-nine patients were enrolled. The age, gender, locations of involvement, clinical and imaging features, treatment methods and results were retrospectively analyzed. RESULTS: The age of patients ranged from 15 to 73 years old, with a mean age of 38 years. The male to female ratio was 1∶2.9. The most involved age group was 30-40 years old (19 cases, 48.7%) . Apical regions of the mandibular first and second molars (17 cases, 43.5% ) were the most involved locations. According to the classification of WHO, the most common type was focal OD (31 cases), periapical and florid OD were 5 and 3 cases, respectively. The main type of image characteristics was focal mixed radiopaque-radiolucent lesions (31 cases, 79.4%). The treatment methods were curettage of the lesions, in which root canal therapy was performed in 17 cases, and tooth extraction was performed in 7 cases. The follow-up period was 6 months to 2 years without postoperative complications. CONCLUSIONS: Osseous dysplasia of the jaws often involved the mandibular molar regions in female patients in their mid-thirties. The most common type of imaging characteristics was focal OD. Surgical curettage is indicated when the lesions are associated with clinical symptoms or significant bone expansion.

Key words: Osseous dysplasia, Curettage, Jaws, Retrospective study