CLINICAL MEDICINE

Detailed explanation-1: -The Frankfort Plane is an imaginary line passing through the external ear canal and across the top of the lower bone of the eye socket, immediately under the eye (see Figure 2). This position is important if an accurate reading is to be obtained.

Detailed explanation-2: -Focal Trough An imaginary, three-dimensional curved area that is horseshoe shaped.

Detailed explanation-3: -A grid is a device used to decrease film fog and increase the contrast of the radiographic image. It does this by reducing the amount of scatter radiation that reaches an extraoral film during exposure. Scatter radiation causes film fog and reduces film contrast.

Detailed explanation-4: -If the patient’s anterior teeth are not positioned in the groove on the bite-block and are either too far forward or anterior to the focal trough, the teeth will appear “skinny” and out of focus.