A friend of mine is getting two crowns done. During the first prep, the dentists put the packing cord around the tooth to lower the crown margin below the gum line. After the temporary was placed she went home. She has complained about the soreness of her gums for over a week now, and is not looking forward to getting the second prep done (due to gum pain following packing cord) She claims that "she knows somebody" that has had crowns done WITHOUT any packing cord. I have never observed a crown prep without packing cord. Is it possible to do a prep with no packing cord? And if so, when is that indicated?