The best method to reduce radiation caries is application of viscous
**Core Concept**
Radiation caries is a condition where the teeth decay rapidly due to changes in the oral environment caused by radiation therapy to the head and neck region. This condition is often seen in patients undergoing radiation therapy for cancer treatment. The application of a viscous material is a method to prevent or reduce radiation caries.
**Why the Correct Answer is Right**
Viscous materials, such as acrylic acid polymers, can be applied to the teeth to reduce radiation caries. These materials work by releasing fluoride ions, which help to strengthen tooth enamel and prevent decay. The fluoride ions also help to reduce the pH of the oral environment, making it less conducive to the growth of bacteria that cause tooth decay. The application of viscous materials is a non-invasive and effective method to reduce radiation caries in patients undergoing radiation therapy.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because there is no evidence to suggest that the application of a non-viscous material, such as a topical fluoride gel, is effective in reducing radiation caries.
* **Option B:** This option is incorrect because while fluoride varnishes can be used to prevent tooth decay, they are not the best method to reduce radiation caries.
* **Option C:** This option is incorrect because there is no evidence to suggest that the application of a material that does not contain fluoride, such as a calcium-based material, is effective in reducing radiation caries.
**Clinical Pearl / High-Yield Fact**
Remember that radiation caries can occur rapidly, often within a few months of radiation therapy. Regular dental check-ups and the application of viscous materials can help to prevent or reduce the incidence of radiation caries.
**Correct Answer:** B. Varnish.