What term describes the differences in shades of gray seen on a dental radiograph?

• A. Contrast
• B. Density
• C. Sharpness
• D. Noise

Answer: (A)

Contrast describes the differences in shades of gray seen on a dental radiograph. It reflects how distinctly adjacent structures with different densities—like enamel, dentin, pulp, and surrounding soft tissues—are separated on the image. When contrast is high, these differences are clear and boundaries between structures stand out; when contrast is low, the shades blend together and details become harder to distinguish. Density refers to the overall darkness or lightness of the image, sharpness to how well edges are defined, and noise to random graininess that can obscure detail.