Mitral valve repair surgery (prosthetic material ring with native valve) 6 months postop are antibiotics required for life for dental work in us & uk?

Yes, for life: According to ada, antibiotic prophylaxis should be considered for people with: artificial heart valves. A history of an infection of the lining of the heart or heart valves known as infective endocarditis. A heart transplant in which a problem develops with one of the valves inside the heart. Heart conditions that are present from birth. Always remind your dentist about your condition.

Yes for replacements: If you have your mitral valve replaced it is necessary to pre medicate with antibiotics prior to any dental procedure that may involve bleeding. That would include cleanings, extractions , root canals and any invasive procedures. Your dentist will tell you when to pre medicate.