Implant healing abutments for 2 side-by-side teeth. Is there a covering for this area to help me to enunciate sounds better, like a partial nightguard?

Bio-Temps. provisional crown system is used for cases where immediate temporization is indicated. Ask your surgeon for more information.
Ask Your Dentist. You haven't given us enough details about the teeth involved and the teeth around them for us to be able to provide an answer. Your dentist may be able to provide the solution to your problem. Best of luck.