I want to choose the shade for my zirconia bridge but i have not seen a color chart. Is there one?

Hello there,I would suggest asking your dentist to use a shade guide with you.  Your skin tone should be taken into account when selecting your tooth
shade. Just because a shade looks great on a friend doesn't mean it's right for you. It may
look lighter or darker on you, depending on your skin tone. Be sure to
look at before and after photos, when selecting your dentist. They will give
you a pretty good indication about what you can expect. Good luck and I hope
this helps. Follow me if you have more questions.
Sarah
Thompson, DMD
St.
Louis, MO area (O'Fallon, IL)
Real Self
100

Share color selection with your dentist using the shade guide he/she has. The shade can then be communicated to the lab. 

There are many different types of shade guides.  Your dentist probably has several to use and should be able too let you decide, just let them know.