What is the purpose of a thyroid collar in dental radiography?

The purpose of a thyroid collar in dental radiography is to protect the patient's thyroid from scatter radiation. The thyroid gland is sensitive to radiation exposure, and excessive exposure can increase the risk of thyroid cancer and other health issues. By using a thyroid collar, which is typically made of lead or another radiation-absorbing material, the amount of scatter radiation that reaches the thyroid region is significantly reduced. This enhances patient safety during radiographic procedures by minimizing unnecessary radiation exposure to vital organs.

Other functions, such as holding the film in place, enhancing image contrast, or stabilizing the jaw, do not pertain to the use of a thyroid collar. Each of these operations is served by different tools and protective measures within the dental radiographic process.