They are not good for diagnosing decay, bone level, and certain types of periapical pathosis. Bitewing radiographs are important for detecting decay in between the teeth and for evaluating the periodontal condition. They provide a good view of the bone level. Changes in bone height can also be detected with bitewing radiographs. This information can aid in proper cleaning of the teeth.
Periapical radiographs show the entire tooth from the crown to the root apex.
This type of film will show any root anomalies, changes in the bone surrounding the root, cysts, abscesses, etc. The fine detail obtained in these films can be extremely important and helpful in diagnosis. The American Dental Association has recommended that the type and frequency of dental radiographic examination be based upon clinical judgement after examination and consideration of the dental and general health of the patient. There are, however, some basic guidelines dentists follow. On average, dentists do request bitewing radiographs approximately once a year.