Crown Lengthening Article | Periodontal Disease | ColgateĀ® Oral Care Information Check-ups & Dental Procedures
The above website may answer some of your questions about crown lengthening.
I would think that the dentist should have known that this procedure was going to be necessary before he did the crown prep. You should have been informed BEFORE the procedure was started. I question why the dentist has to refer your son to a periodontist to do the crown lengthening and why do you need a consult if you've already been told that is what is needed?? A good dentist should be able to do the crown lengthening him/herself.
Honestly, I'd say your dentist and the periodontist may be in kahoots (not sure if that's a word OR how to spell it, sorry). It sounds like a scam to me, but here in Canada we do things a little differently.
A lot of dentists won't crown a tooth until 3 or 4 months after the root canal is done to be sure that the nerve is OK and healing well. Why was your dentist in such a hurry to get this done so quickly?
There is no reason why you couldn't go for a second opinion to another dentist. You have every right to do so.
As for the impacted teeth. I am guessing your son has 3 wisdom teeth that are impacted? There is no room for them to come into his mouth? They are laying on an angle that might cause problems with his 12 yr molars (2nd molars)? It IS better to have these teeth removed when you are young as the healing is quicker with younger people.
They could be removed anytime from now until he's in his 20's if they aren't bothering him.