Why is the image density of root filling not high?

Optical density refers to the opacity of photos, also known as the degree of blackening of photos. Optical density is the logarithmic value of the light blocking rate of a photo. The higher the optical density of a photo, the darker the photo.

Tube voltage: the density is directly proportional to the nth power of the tube voltage, where n is 2.0 ~ 4.5, and the size of n is determined by the tube voltage, the type of film, the thickness of the irradiated part and other factors.

Tube current: mAs is directly proportional to density, which is the most important factor affecting optical density.

Photographic distance: the photosensitive effect is inversely proportional to the square of the focal length. Reducing the focal length can increase the photosensitive effect, but it increases the image blur and amplification distortion.

Detector: The higher the sensitization rate of the intensifying screen, the greater the photo density.

Film development conditions: photo development factors: developer formula, development time, developer temperature and aging degree will all have certain effects on photo density.

Thickness and density of the main body: the thicker the body, the higher the density and the lower the density.