According to shielding rule 4, what type of apron should be used in combination with a thyroid collar?

The use of a leaded apron in combination with a thyroid collar is crucial in dental radiology due to its effectiveness in protecting against radiation exposure. Leaded aprons are designed to attenuate scatter radiation, which is a significant concern during imaging procedures.

By incorporating a thyroid collar along with the leaded apron, practitioners ensure comprehensive protection for sensitive areas, particularly the thyroid gland, which is highly susceptible to the effects of radiation. The leaded apron provides a barrier that significantly reduces the amount of radiation reaching the body, aligning with safety protocols designed to minimize exposure for both patients and dental personnel.

Other options do not provide the same level of protection. Lead-free aprons, while lighter and more comfortable, may not offer sufficient shielding against radiation. Both plastic and cloth aprons do not provide adequate protection and are not suitable for use in a radiographic environment. Hence, the choice of a leaded apron is aligned with best practices in radiation safety standards.