I see what you are saying, yes, I agree it is possible to be registered in Australia as an oral surgeon and still do OMS work. The reason this is possible is because those people have done proper OMS training overseas, in effect, they are oral and maxillofacial surgeons and as you say it is only politics stopping them from being able to register as such. However, my comments are in specific reference to this new Sydney course. This course does not intend to train oral and maxillofacial surgeons, it intends to train oral surgeons. That is the difference versus the overseas courses. And that is why I believe their scope will be limited.Similar example:
Dr. Hanlie Engelbrecht
BChD, DipOdont(MFOS), MDent(WITS)MFOS, FCD (SA)MFOS.
The woman (above) has the exact same qualifications and surgical training as the OMS in the previous example (they are both single degree trained OMS from South Africa). However, because she was registered more recently (after they changed the name game rules in Australia) she is an "oral surgeon". However, as I said before they both have the same OMS surgical training from the same University in fact (they are both single degree OMS specialists regardless of title) and therefore have the same scope of practice.
As a matter of fact, Dr. Engelbrecht also completed a fellowship in Cleft and Craniofacial surgery after her OMS training. So she is competent and able to perform a very wide scope of surgical services.
Doctor of Clinical Dentistry (Oral Surgery)
The Doctor of Clinical Dentistry (Oral Surgery) will develop your skills in the surgical management of the full range of oral diseases in hospital and non-hospital settings, complemented by a research project in the field of oral surgery and oral pathology under the supervision of an academic staff member.
note the intention of the course. To make you proficient in oral stuff. Not maxillofacial stuff.