[Radiology and the tooth].

Radiological examination of the tooth and its appendages (periodontium) was poorly defined for a long time. It is based on a panoramic film, constituting a real scout film often completed by occlusive and intraoral films. The long-cone retro-alveolar assessment allows exact evaluation of dental and periodontal disease and determination of its nature (periodontitis, complex active periodontitis, etc.). Apart from malignant diseases, the CT scan is virtually only used in implantology assessments.