Dental film mainly refers to X-ray dental film, which is an imaging test for dental professionals to determine the extent of dental lesions through density comparison.
1. Dental films are mainly used to show the periodontal tissues and the structure of the teeth, in the order of looking at the crowns of the teeth first, then the roots and the periodontium.
2. In general, hard tissues show a high density, or white image; dentin follows, with lower high-density images of osteoid and alveolar bone; soft tissues are low-density shadows, appearing black, with the darkest color being the apparent image of air.
3. The main thing to look at a bad tooth is the contrast in density, if it is carious, presenting a low density image. Simply put, it is supposed to be white presenting a black image, indicating that the tooth is carious, and the degree, depth, and extent of caries can be seen through imaging.
If you want to know more about dental radiographs, you can check out specialized books on dentistry, which are more comprehensive and authoritative.