I don't actually end up seeing the cost of any of these items. My government-supplied health care pays for all of them. Except, I suppose, the dental x-rays, but those are covered by my workplace dental plan.
I suppose if we're talking about making medical technologies less expensive, I'd lobby for adding prescription medication to the government-funded health care plans. Prevention is much less expensive, and currently, low-income people can go see a doctor for free, but they cannot afford the medication that will keep them out of the emergency rooms.