CLINICAL MEDICINE

Detailed explanation-1: -For radiographic purposes the periodontal ligament is our landmark. The periodontal ligament (PDL) is comprised of strong connective tissue fibers that suspend the tooth, like a shock absorber, in the alveolar socket. The PDL will appear as a thin, radiolucent (dark) line surrounding the root of the tooth.

Detailed explanation-2: -The developing chemicals reduce the exposed silver halides in the emulsion to metallic silver, which is black. The increase in intensity of light from the intensifying screens causes more of the silver halides to turn to metallic silver, thus giving the various shades of gray and black on the developed radiograph.

Detailed explanation-3: -Structures containing air will be black, and muscle, fat, and fluid will appear as shades of gray.

Detailed explanation-4: -Low density material such as air is represented as black on the final radiograph. Very dense material such as metal or contrast material is represented as white.