Darkening of the root of the tooth on radiographs may be a translucent image, which can be seen in periapical abscesses, apical granulomas, and periapical cysts.
1. Periapical abscess. Dental tissues are imaged as high density images on x-ray due to their high density, and the pulp and periodontium are soft tissues presenting low density images, which appear as black in translucent images on x-ray. The blackening of the root of the tooth may be the emergence of periapical inflammation, periapical abscess, manifested in the apical root of the tooth, surrounded by diffuse translucent shadow, the border is not clear.
2. apical granuloma. Apical granuloma is the apical part of the root with granulation tissue, generally more limited diameter is less than a centimeter, and the surrounding border is clear.
3. Periapical cyst. Long-term periapical inflammation can cause periapical cysts, the diameter is usually larger than a centimeter around the border clearly visible dense bone white line.
Taking dental radiographs of the root of the tooth is black, may also be caused by human factors in the dental radiographs of the black, can be assisted by CT examination as well as oral examination to confirm.