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If the dds, md has both licenses, they are full blown dentist and physician. I believe some dds, md do NOT maintain active physician licensure due to costs, ce, and the lack of true benefit due to the dental license.
As an intern I have prescribed tons of stuff outside your definition of dentistry that have already come up on this thread. My attending co-signs, they are majority dds only.
It is interesting that in an inpatient setting, I/my OMFS team could probably prescribe ANYTHING. Yet when I leave the hospital 6 years from now, I will apparently get quite a bit of resistance.
It isn't MY definition of dentistry that matters, it's the state's legal definition. Pharmacy is one of the most highly regulated professions, and community pharmacies are inspected and audited regularly, both by the state board of pharmacy and by insurance companies.
I currently work at a VAMC and really haven't encountered any inpatient orders written by our dental service. But I could see how this could be an issue. If someone is admitted to the hospital, someone has to do the orders to continue home meds, slide scale insulin, stress ulcer prophylaxis, etc... While these might be considered outside of the scope of dentistry in the community, they'd be part of basic inpatient mgmt. So maybe it is different inside the hospital vs. outside... ?
Edit: when my father was admitted to the hospital for surgery by his DPM, his maintenance meds, insulin, etc. were handled by a hospitalist ARNP. The DPM took care of his antibiotics and pain meds. DPMs have a similar scope restriction in this state (foot and ankle) so perhaps that's why the hospital used the ARNP to handle the other stuff.