Answer:
The correct answer to the following question is that this would be prohibited as per ERISA ( which is employee retirement income security act ), because it is a transaction between a plan and party in interest.
Explanation:
Here the kind of transaction that dentist is making in the question is prohibited by ERISA, which prevents parties who have a improper influence over a plans asset to make deals and also prevents fiduciary such as employer ( dentist in this case ), trustee, custodian etc, to get involve in dealings which are in conflict of interest.