Poor little girl

I read that story about the poor little five year old girl who is now brain dead after dental sedation. Here's an excerpt from the Chicago Sun Times.:

"Diamond Brownridge, the 5-year-old Southwest Side girl who slipped into a coma after being sedated by her dentist, was clinging to life late Monday at Children's Memorial Hospital.....Diamond's sedation involved three steps. First, she was given a substance to drink from a cup. Then the clinic administered what it called "goofy gas,'' Travis said. Finally, she received intravenous sedation....the child, who had been grinding her teeth, had complained of dental pain and been diagnosed with two cavities, her mother said. She was also getting caps on some lower teeth..."

Ok my first question is why is a five year old child getting caps on lower teeth?
Second, of course, is what happened?

No one seems to know at this point.

For more information about the dangers of IV sedation, here is an article by ABC News.

But the episode led me to do a google news search on dentists. It brought up a story about sexual abuse, a story about a Birmingham (UK) dentist accused of ordering a firebomb attack on a Birmingham house which killed a six-year-old girl, and a whole bunch of other strange stories about dentists. These stories led me to look up that urban legend about dentists having high suicide rates. I found this article, which seems to refute that claim, although it has a very funny graphic cartoon.