My bilateral hip implants were done over 10 years ago and I still take antibiotics before appointments. My old dentist said the same as yours, however my current dentist & my current Ortho doc agree there is SOME risk. The dentist REQUIRES me to premedicate, or they won't see me. When they see I am further compromised by bronchiectasis & MAC, I'm sure they will be even more insistent. Talk to your Ortho, pulmonologist or primary doc if the dentist doesn't want to prescribe.