What is a porcelain metal-supported crown? Porcelain metal supported crowns are fixed prostheses that we use to give the shape we call coating to decayed and damaged teeth to regain their tooth form. Metal supported crowns or metals made of nickel or gold are used to withstand the force underneath. Implants Metal supported crowns are generally preferred on top. Again, the reason for this is that metal supported ones can withstand the force very well. Since they can withstand the force very well, metal supported crowns are generally suitable for broken teeth after root canal treatment or after large fillings, after the necessary arrangements are made to hold the broken pieces of the teeth together.