Dental Lab Procedures
A crown is a tooth shaped cap that is put on over the tooth to restore the size and the strength of that tooth. When the crown is cemented into place it appears as the original tooth above the gum line. Crowns are great options for those weak teeth that sometimes we have no control over. Most crowns require two visits. The first visit the dentist will prepare the tooth and make the temporary. On the second visit, the patient receives the crown for fitting. For the all porcelain crowns, depending on the technology in the office, it takes one day. In that one day the tooth is prepared, and with a special machine, the crown can be made in the office. Therefore, there is no need for a temporary.
There are many reasons a crown may be needed. One reason is to protect a weak tooth, possibly from decay. Another reason is to restore a broken tooth. Also they are needed to cover a tooth with a large filling, to hold a bridge in place, to cover discolored teeth, and to cover an implant. Along with the various needs for a crown, there are a variety of types.
These permanent crowns can be all metal, porcelain-fused-to metal, all resin, or all ceramic. The metal crowns are composed of gold alloy, other alloys, or a base-metal alloy. For this type of crown, less tooth structure needs to be removed and the wearing of the opposing teeth is kept to a minimum. This type of crown probably lasts the longest in terms of wearing down because they rarely chip or break. The main reason this type is not chosen as much anymore is because of the esthetics. Otherwise, it is a good choice for out of sight molars.
Porcelain-fused-to-metal crowns can be matched to your other teeth but the opposing teeth receive more wear than the all metal and resin crowns. This crown can be a good choice for the front or back teeth. One...