Dental work on 6yr. old child

I read on another message board something about a child getting a seizure from anesthesia.  The doctor mentioned something about a pre-disposition to seizures. Then The anesthesia causing the seizure.
My question is...my 6yr old has to have dental work because he has a cavity and special needs and won't let anyone in his mouth for more than a few seconds.  I don't believe in restraints for him as he has anxiety and that will add to his anxiety's.  What are the chances of him getting a seizure?  This might sound silly...he's never had a seizure (thank God) and he's never had an MRI.  How do I know if he has a pre-disposition to seizures?  (Does that make sense?) I'm afraid the anesthesia might cause a seizure in him since something is going on with him already.  He has an appt. with a psychiatrist next month.  Should I wait to talk to the psychiatrist before making the dental work appt.?
Am I worrying unnecessarily?  Of course I will talk to the dentist about my concerns with anesthesia although I'm actually asking lots of people for advice before I schedule any work to be done on my son.

[Jerome Bogin, D.D.S.]

I do not have any experience in giving a patient sedation anesthesia. I teach with a dentist that does this and the chances of seizures i very small, but I certainly would discuss the possibility with the dentist that is doing the case.

[T709]

I have a 5 year old w/ ADHD and Tourette's who needs several teeth worked on.  I'm also scared to death that he might have a problem w/ the anesthesia.  I have been trying to hold off having the work done in the hopes that the teeth will fall out (the baby teeth usually start to fall out around 6 years old) before they cause any major problems.  I have been brushing the decayed teeth several times a day w/ lots of toothpaste and watching for any signs of abcess (abscess) (like a bump on the gum below the affected tooth).  I'm not reccomending that you do this but I know the dilema that you are going through.