I have Dentinogensis Imperfecta - which basically means the dentin in my
teeth is badly formed and weak.  My enamel is okay but once that breaks off
(which happens pretty easily), it's all downhill from there.  Right now I
have bonding on the front of all my remaining teeth (10 back teeth were
extracted).   My DMD has suggested crowning my remaining teeth w/PFM crowns,
as they're getting worn down now and we want to preserve my natural teeth as
long as possible (I'm only 26 years old).  My  question is this - crowns are
the standard treatment for DI, correct?  It's not very common so it's hard
for me to find information about it.  And, does having PFM crowns put on mean
that I'll have the dark line at my gums?  I have two PFM crowns now and they
don't have it, but I've heard some horror stories...my medical insurance is
paying for this bc it's a congential disease, so I want to make sure to do
the best possible treatment.

Thank so much.