Hi,
Here are a few sites that can give you some info on HBO treatment. I have been involved in cases where I have done extractions post H&N radiation therapy where it has been used and cases where the patient was just placed on antibiotics. I follow the suggestions of the RO on a case by case basis. Some researchers say that the icidence of ORN can be reduced from 27% to <6% with HBO treatments prior to dental extraction, others don't support this data due to the fact that the sample size for the studies were small, there were some proprietory influences in some studies, and the studies were not double blind.
Talk to your RO's and ask their opinion.

Brian, Gary and Dileep do you wonderful gentleman have any thoughts or information to add here.

http://www.nhshealthquality.org/nhsqis/files/EN15_HBOT_Revision.pdf

http://www.cda-adc.ca/jcda/vol-67/issue-7/384.html

https://www.fhshealth.org/services/OsteoradPressurePoint.pdf

http://www.oralcancerfoundation.org/dental/hyperbaric.htm

I hope this is useful.

Cheers,

Mike