The American Academy of Orthopedic Surgeons (AAOS) and the American Dental Association (ADA) have released a document dated 12/18/2012 that indicates there is not sufficient evidence to recommend routine use of antibiotics for dental procedures for patients with joint replacement. The joint, collaborative effort states there is no direct evidence that routine dental procedures cause prosthetic joint infections.
There is a growing concern in the medical/dental community that the overuse of antibiotics have rendered them ineffective against fighting infections. This finding will help reduce the use or potential overuse of antibiotics. There is also a risk of allergic reactions to antibiotics.
I personally believe that the emphasis for joint replacement patients should be to be sure they are in top oral health prior to their surgery and recovery.