Over time some of our teeth with old fillings will become susceptible to problems such as decay and cracks. Large old fillings, especially on the back molars, in some cases fillings or bonding will not be sufficient. The back molars should be strong enough to withstand the hard pressures of chewing. That is why crowns are necessary.
Crowns can be made from porcelain, porcelain fused to metal, or a full gold crown. To maintain a natural look a porcelain finished crown is best, as it can be matched to the shade of your other teeth. This will allow it to blend in and appear just like one of your natural teeth.