The use of digital image processing has gained acceptance in dental diagnostic science. The major limitation of direct digital radiography (D D R) is noise. Noise in digital radiography may result from sources other than variation in projection geometry during exposure. Structure noise consists of all anatomic features other than those of diagnostic interest. Limitations of plain radiographs in detecting early, small bone lesions are also due to the presence of structure noise. This study will be under taken to apply image processing as an attempt to remove structure noise in digital dental radiography by using derivative original image. After derivative original image, the validity of the digitized image in detecting disease is enhanced.