Which statement about deterministic effects is true in the context of dental radiography?

• A. Deterministic effects have a threshold dose and can cause tissue damage, such as skin burns or cataracts.
• B. They occur with no threshold and are purely probabilistic.
• C. They are not relevant to dental imaging.
• D. They are prevented entirely by shielding.

Answer: (A)

Deterministic effects are those that only appear once a certain dose threshold is exceeded, and the severity of the damage increases as the dose goes higher. In dental radiography, this means tissue damage like skin burns or cataracts would occur only if the absorbed dose to those tissues crosses that threshold; at diagnostic dental doses, these effects are unlikely, but the principle remains that a threshold exists and damage is dose-dependent. The statement is correct because it captures both the presence of a threshold and the potential for tissue damage when that threshold is met or exceeded.

Shielding and careful technique reduce the dose, but they do not guarantee absolute prevention of these effects in all theoretical scenarios; and the concept is still relevant to dental imaging for safety planning.