Final answer:
The ADA and FDA recommend using routine dental x-rays with a lead apron and fast films as the safest dental imaging procedure for pregnant patients to minimize fetal radiation exposure while still providing necessary diagnostic information.
Step-by-step explanation:
The American Dental Association and the FDA recommend that, for a pregnant patient, the dental imaging procedure that can be used most safely is routine dental x-rays, with special precautions like the use of a lead apron and fast films. Radiation exposure during pregnancy is a concern, and therefore, imaging modalities that provide the lowest dose of radiation are preferred.
Routine dental x-rays give a dose of about 5 mSv (0.5 rem), which is directed to the tissue being imaged, and with the advancements in imaging techniques and faster films, the diagnostic dose has been reduced. Additionally, the x-ray tube is surrounded by shielding, and the use of a lead apron further limits exposure to the fetus. The lead apron is placed over the abdomen of the pregnant patient to protect the unborn child from any scatter radiation.