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2. Medical Sources of Radiation
According to the USNRS, the remaining half of human radiation exposure occurs through medical sources. Among them, the highest exposure is from a Positron Emission Tomography – Computed Tomography (PET/CT) of about 2.5 rem, followed by 1.2 rem from Coronary Computed Tomography Angiography (CTA). Here is a comparison chart of various source of medical radiations, which is available at the website of American Dental Association:
Table 1. Effective Dose Exposures from Medical Examinations and Procedures2,3 . I mSV = 0.1 rem
|Type||Average Effective Dose (Adults) in Millisieverts (mSv)||Equivalent Effective Dose (Adults) in Microsieverts (µSv)|
|Intraoral X-Ray||0.005 mSv||5.0 µSv|
|Dental panoramic radiography||0.01 mSv||10 µSv|
|Chest radiography||0.1 mSv||100 µSv|
|Dental computed tomography||0.2 mSv||200 µSv|
|Mammography||0.4 mSv||400 µSv|
|Upper G.I. tract radiography (including fluoroscopy)||6.0 mSv||6,000 µSv|
|Coronary computed tomography angiography||12 mSv||12,000 µSv|
The Safety of Dental Digital X-rays
Now coming back to the dental x-rays. From the above chart, it is obvious that radiation exposure from digital intra-oral x-rays is the least among different types of medical radiations, about 0.0005 rem, which is 20 times less than a chest x-ray (0.01 rem). In contrast, according to the guidelines provided by the European Commission4 , radiation exposure from a single conventional radiograph is about 0.0017 rem, about 3 times more exposure than a digital radiograph.
Multiple X-ray Images are Required During Routine Dental Procedures; Are they Still Safe?
More than one x-ray may be required during your routine dental checkup. Let us suppose that we take an average of 4 intra-oral x-rays on each checkup for every patient. This would account for a total radiation exposure of about 0.002 rem. This is still 5 times less radiation than a single chest x-ray image! Here are the radiation exposures from other types of dental x-ray images.
Table 2. Effective Radiation Doses for Dental Radiographic Examinations5
|Type of Exposure||Effective Dose (Adults) in Millisieverts (mSv)||Effective Dose (Adults) in Microsieverts (µSv)|
|Full mouth series – 18 images|
|–With PSP storage or F-speed film and rectangular collimation||0.035 mSv||34.9 µSv|
|–With PSP storage or F-speed film and round collimation||0.171 mSv||170.7 µSv|
|Bite wing (4 images) with PSP storage or F-speed film and rectangular collimation||0.005 mSv||5.0 µSv|
|Cone-Beam Computed Tomography|
|–Dentoalveolar CBCT small and medium field view||0.011-0.674 mSv||11-674 µSv|
|–Maxillofacial CBCT with large field of view||0.030-1.073 mSv||30-1073 µSv|
These radiations are well within the safe limit of 0.1 rem for the general public and individuals who do not have an occupational exposure to radiation .
It is estimated that the total yearly dose of radiation each person receives is about .62 rem, about .31 rem of this dosage is from medical sources. Therefore, the radiation exposure from a routine dental checkup (0.002) is 300 times less than the annual radiation exposure.
Other Safety Measures at Centerport Dental Against Unnecessary Radiation Exposure
That is not all! At Centerport dental, we follow the ALARA6 guideline provide by the American Dental Association. ALARA stands for “as low as reasonably achievable” dosage. Therefore, we only take x-rays when they are essential for your treatment and diagnosis. In addition, we also take great care to protect children and pregnant women from unnecessary radiation exposure. For this purpose, we use lead aprons and thyroid collars, which limit the radiation exposure to the fetus and the thyroid gland, respectively.
The Final Word
In conclusion, we can safely assume that radiation exposure from dental x-rays is very low and is very likely to cause any harmful effect on your body. Still, I take great care to limit the exposure of my patients as well as my dental staff to unnecessary radiation exposure.