When you start process of prosthesis your doktor will be offer different design and many materials for crowns or bridges.

- you must to know what is metal consist (beryllium is impermissible when metal used)
- what is hardness of used porcelain (it will be not harder than natural teeth)
- what type grinding (with ledge or less)

It is that if will be to present beryllium - it will be beryllios illness, if it will be no ledge - inflammation of gums. The too hard porcelain will be to do pat-erasure of teeth...