Table 1. Definitions Used For Radiographic Lesions19-21.
| Missing teeth | All permanent teeth not on the radiograph |
| Unerupted teeth | Teeth that had not reached the occlusal plane and which were not impeded from doing so |
| Impacted teeth | Teeth with fully or incompletely formed roots, impeded by hard tissue from reaching their correct relationship to the occlusal plane and surrounding bone |
| Hypercementosis | Formation of excessive cementum on tooth roots |
| Peri-apical radiolucency | Radiolucency associated with the apex of a tooth root |
| Caries | Radiolucent areas in a tooth |
| Attrition | Wearing away of a tooth where teeth rub together |
| Tooth fracture | Fracture of the crown and/or root of the tooth |
| Retained roots | Roots which cannot be restored because of insufficient remaining healthy tooth tissue and/or supporting tissue |
| Interdental bone loss | Lack of continuity of lamina dura |