Hysterectomy in 3wks- dentist wants to clean under crown needs to cut gums & stitch-no infection- should i wait do it after surgery to avoid infection?

Depends: You will be laid up for a few weeks after surgery, so it depends on the urgency of the Dental treatment. If no great risk in waiting to treat crown, then best to wait. If waiting a big risk for crown treatment's success, then get it done soon. Ask the Dentist what the risk factor is in waiting 2 months. Then make the decision that makes the most sense to you. Good Luck with both.