2.  No film or processing chemistry is used.  Digital radiograph instead uses an electronic sensor and computerized image system that produce x-ray images on computer monitor.

3.  To detect the lesions, diseases, and conditions of the teeth and surrounding structures.  To confirm or classify suspected disease.  To provide information during dental procedure  (RCT) (implant placement ).  To evaluate growth and development.  To illustrate change secondary to caries, periodontal disease, or trauma.  To document the condition of the patient at specific point in time.

4. direct digital imaging The essential components of direct digital imaging system include an x-ray machine,a intraoral sensor,and computer monitor. The sensor placed into the mouth and exposed to x-ray,the sensor captuer the radiographic image and transmite the image to a computer monitor.software is used to enhance and store the image.

5. indirect digital imaging The essential components of an indirect digital imaging system include a CCA camera and computer,the CCA camera scan the image and digitalize and then display it on to computer monitor.the indirect image is copy that mean is versus the original.

6.  Superior gray scale resolution,colored imaging.  Reduce exposure to x-radiation.  Increase speed of image viewing.  Lower equipment and film cost.  Efficiency.  Enhancement of diagnostic image.  Effective patient education tool.

7.  Cost  Quality  Sensor size  Infection control