I echo and support the comments of my colleagues,especially Dr Norbo of the VDA and Dr Sarrett of VCU. As a dentist with over 20 years in private practice I have seen patients with restorations that have lasted a very short time and those that have lasted 50 years. What is the difference? Perhaps the quality of the materials and work but only in a very few cases.Overwhelmingly the difference between a restoration that succeeds and a restoration that fails is the patient. The patients' medical history,lifestyle,oral habits,health habits,committment to regular dental care, etc,etc,etc. All factors over which the dentist has no control. To force the dentist to  "warranty" such a situation is unreasonable , will place undue regulatory burden on practitoners and only cause the cost of care to rise for all patients.