Periodontal disease is the second most prevalent clinical entity among oral diseases, and is recognized as a serious public health problem. Osseous destruction as a result of periodontal disease is classified according to clinical criteria into horizontal (or even) and angular (or vertical) osseous destruction. The detection and accurate assessment of the location, extent and configuration of the endosseous defect is important for the determination of the tooth prognosis, the treatment plan and the maintenance procedures. Radiographic examination is a complementing mean of great importance to obtain the diagnosis of periodontitis, even though it does not reveal the real state of cellular activity, but shows the consequences upon dento alveolar structures.