Porcelain Fused to Metal Crowns
When biting pressure is too great for porcelain jackets or when gaps from missing teeth must be filled in, metal alloy must be placed under the porcelain for strength. This is the porcelain fused to metal crown technique.
Again, the teeth are prepared for a full coverage restoration. After the impression is taken, a metal coping is made for the prepared tooth. This is then covered with porcelain.
Porcelain fused to metal crowns do not have the translucency of pure porcelain crowns. Therefore, the esthetics may be slightly compromised in some situations. However, a talented ceramist with experience in custom staining can usually overcome the limitations, thereby creating lifelike restorations.
When teeth are loose due to periodontal bone loss, this technique is used. Here the teeth are splinted together by joining the metal substructure of the crowns.
The crowns are tied together like a small fence in the mouth.