Porcelain Fused to Metal Dental Crown is a full cast crown having porcelain fused to either all or most of its surfaces. The metal alloys used have a high melting temperature so that porcelain can be bonded to the surface by being fired without the metal being melted. They have the properties which permit the bonding of porcelain without affecting its color. The alloys have also the properties allowing it to be cast, soldered and polished in the dental lab.
The tooth preparation for porcelain fused to metal crown allows more tooth tissue to be removed from the buccal surface to allow for the thickness of the metal as well as porcelain.
Indications for Porcelain Fused to Metal Dental Crown
In situations where a stronger restoration is required, like in the presence of minimal interocclusal clearance. It is indicated on any tooth when a full crown is justified from a restorative and preventive standpoint.
Porcelain Fused to Metal Dental Crown Contraindications
Porcelain fused to metal crown is contraindicated on a tooth with a pulp of a size that makes it impossible to prepare the tooth correctly. It is also contraindicated on tooth with a very short clinical crown that will have insufficient retention and stability after it has been reduced to allow space for metal and porcelain.
Advantages of Porcelain Fused to Metal Dental Crown
The strength from metal substructure is its major advantage. It resists occlusal and other forces well.
It may allow minimum palatal reduction.
Metal ceramic crown can be adapted to any shape of tooth preparation. Additional retention can be gained in difficult preparation by the use of pins or grooves.
Porcelain fused to metal crowns can be attached to other crowns by soldering or casting them together.
Disadvantages of Porcelain Fused to Metal Dental Crown
The necessity to remove at least 1.5 mm of tooth substance buccally to allow for the placement of the metal and porcelain layers. Unsightliness can result from the difficulty in rendering opaque the metal alloy layer.
Because of the metal framework it is often more difficult to match the natural appearance of a tooth particularly at the cervical area. To minimize the gray line effect on the margin of a porcelain fused to metal restoration, butt joint margin can be done.
An accidental blow may result in the tooth or root fracturing because the crown is stronger than the natural tissues.
When precious metal alloys are used, the cost is greater.
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- This page was created on January 5 2012.
- This page was updated on March 26 2012.
 Johnston J F et al: Modern practice in crown and bridge prosthodontics. WB Saunders Company
Jesus Lecitona+, DMD, MScD-Prosthodontics