Abstract
The purpose of the present study was to investigate, on the basis of radiographs, the prevalence and special characteristics of developmental bone defects near the angle of the mandible among an adult population. Ten bone defects were observed in the 10,000 orthopantomograms studied, i.e. a prevalence of one per thousand in the total material. All defects were unilateral and occurred in men only. The mean age was 54 years and the age range 19 to 72 years. The diameter of the defects ranged from 8 to 22 mm, mean 12.8 mm. The largest cavities were seen in the oldest individuals of the series. In eight of the 10 cases the defect was above the inferior border of the mandible. One patient was followed-up for 3 years, and during this time neither the size nor the shape of the defect on the radiograph was seen to have changed.
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