I would oppose this proposed regulation based on clinical research findings on reasons for failure of dental crowns and bridgework. These findings place the most common reasons for failure on patient compliance. Recurrence of decay around these appliances is the major cause of failure and this is caused most often by lack of good hygiene & regular dental care,  the individual's oral environment and the general health of the patient.  Mechanical failure of the actual appliance is rare. It is very difficult to make a guarantee of patient compliance.