Mirthquake's post gave me an idea. Just pretend you're Bill Murray's character in "Shop of Horrors" and that you LOVE the dentist and you'd go there every day if you could.
This is an old reference, but I remember back when Tom Green was really popular, there was a Rolling Stone cover story on him and he was talking about his surgery (this had to have been at least 4 years ago), and he was saying how he dealt with it by "flipping it", meaning he was really scared but to make it easier to deal with, he pretended that he *wanted* to go under the knife and that it was fun. Like, taking something you dread and pretending that you love it.
On a more practical side, will they let you use headphones so you can listen to music? Ya know, until you go under ... ?