Abstract
Radiographs are commonly used in the diagnosis of periodontal diseases. They can be used to assess bone loss and the pattern of loss as well as in the identification of other periodontally relevant features, such as overhanging restoration margins, calculus deposits and furcation lesions. Horizontal and vertical bitewings, panoramic radiographs and periapicals can be used for periodontal assessment. Referral (selection) criteria based on clinical signs can assist the decision of the radiographs to use. All exposures must be made in accordance with the Ionizing Radiation (Medical Examination) Regulations 2000 and each exposure justified.