What Is Ceramic Porcelain Fused to Gold?
When the breakdown of teeth require a crown in an area of high biting force, a ceramic porcelain crown strengthened with a metal, typically a precious metal alloy, may be called for. These restorations have been improved over the forty years since their introduction to dentistry and can rival the cosmetics of an all- ceramic crown when made properly.
When porcelain fused to gold crowns and bridges first became available in the late sixties they revolutionized the cosmetics of strong durable crowns(caps). Prior to this we could make strong crowns but metal color could always be seen. In the front of the mouth we could place a white colored plastic acrylic on the most visible non biting aspects of the crown, but this plastic was subject to wear and in a short number of years the worn acrylic would usually show the metal underneath it. Porcelain Glass was found to bond to metal by means of a metal oxide layer created on the surface of the metal and to which porcelain attaches. Improvements in porcelain ceramic technology and even the metals used allowed for the making of crowns and bridges (replace missing teeth) that looked very close to natural teeth.
Advantages of porcelain fused to gold crowns
Advantages of porcelain fused to gold crowns and bridges are good esthetics and a track record of over 40 years of successful use in dentistry. The compressive strength of porcelain ceramic fused to gold or gold alloy metal is perhaps the highest of any ceramic restoration in use today. Because of the strength of the gold metal alloy beneath the porcelain ceramic and its resistance to bending forces over time this restoration even today is the choice of most dentists replacing multiple missing teeth in one dental arch.
Disadvantages of porcelain fused to gold crowns
Disadvantages of porcelain fused to gold crowns and bridges are that despite the vast and significant improvement over white acrylic facing crowns, there is still a measure of difference in how this gold metal backed ceramic treats rays of light. Light is reflected and absorbed different than on a natural tooth making ideal color matching difficult. These problems are addressed in the more recent all ceramic crowns and bridges that do not have gold or metal support beneath the tooth colored ceramic. Also, because light cannot penetrate the porcelain’s gold metal support the roots of the teeth have little or no light penetration which could be responsible for a visible dark line if the gum recedes on the front of a tooth.
What Are Full Gold Crowns?
Made of gold alloy, these crowns are ideal for the back teeth. Less tooth structure needs to be removed with gold crowns as they wear less easily than ceramic ones. Gold crowns rarely chip and can endure heavy pressure biting and chewing.
The color remains its main disadvantage making gold crowns the desirable choice for back teeth.
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