This question is more than six months old, so the information in the answer may no longer be accurate.
Visitor asks:

Dear Sir/Madam,
last week I had a panoramic X-ray taken at a private medical clinic. I was surprised that they did not give me a protective apron; they say that with modern digital machines this is no longer necessary. Is that really the case? My second question is how much time should pass between panoramic X-rays, because whenever I change dentists, each one usually wants me to have a new panoramic X-ray taken.
Kind regards.

Dentist Tomaž Rotar answers:

Dear Sir/Madam!

The intervals between X-rays of course depend on the problem the dentist is treating. If we followed doctrinal guidelines, there would probably be much more X-ray diagnostics than there is. Not all X-ray machines require protection; there are even devices that are used directly at the dental chair. Exposure during these examinations is extremely low and comparable to doses received from cosmic radiation (when we are not indoors) or to doses received during passenger-aircraft flights.

Have a nice day!
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