Three things:
1. Dental insurance should cover an emergency visit. Most do, not all.
2. I have picked up many patients by them being infuriated over the "I'm too busy for you" deal. It takes so little time to temporize that kind of siutation, we either don't charge or submit it to the insurance company and if they don't pay, we don't bill the patient. It is not that complicated and involved and time-consuming of a procedure. Greediness will come back on you (the Dr.).
3. Don't look in the Yellow Pages for the biggest ad. Those large ads mean they are desparate for business. Usually, do patch work that is not good for long-term fixes. They put out fires and never do comprehensive evaluations and restorative work. There is good-better-best. Best costs more, but lasts longer. Higher initial cost, but usually less over time as it does not fail and have to be "re-done". Buy vs rent. The smallest ads in the Yellow Pages mean they don't need to advertise. WORD OF MOUTH is best advertsing. One happy patient tells others. One good indication is to see who the "dentists-dentist" is. Who do the other dentists go to for work? Ask co-workers, church members, etc. The reason I mention see who the dentists go to is--some patients don't have a high dental IQ. They only know if you hurt them or not. So, check out their work. See if it looks natural or you can tell it's man-made and fake looking.
Good luck.