Metal crowns: Gold alloys and certain base metal alloys can be used for crown fabrication. Base metal alloys consist of cobalt, chromium, and nickel in definite proportions.     

 
Gold Crown Dental
 
 
Advantages: Metal crowns have good strength and are relatively inexpensive as compared to ceramic crowns.
 
Ceramic or Porcelain Crowns: Ceramic is a compound of metallic and non metallic compounds. Dental ceramics are the most suitable tooth colored restorative materials. Ceramics are now available in many varieties with varying properties and costs.
 
Different varieties of ceramic available are:                          
  • Dicor                        
  • Cerestore                             
  • IPS empress
  • In-ceram
  • In-ceram spinel

 

 
                        Ceramic crowns                               
Ceramic crowns
Advantage: They are available in variety of shades similar to tooth colour. So, they provide with excellent esthetics. The presence of crown in mouth is not at all noticeable by others.
 
Disadvantage: Ceramic is brittle material. So, full ceramic crown cannot be given for posterior teeth because posterior teeth are subjected to high forces of mastication which can lead to fracture of a full ceramic crown.
 
Porcelain Fused to Metal Crowns: In this type of crown, a coating of porcelain is fused on the surface of metal. By doing this the brittleness of full porcelain crown is overcome by using base of crown made up of metal esthetics are also not compromised by using porcelain on the crown surface which provides good colour matching.
They are most commonly used crowns especially for posterior teeth. For anterior (front) teeth full ceramic crowns are preferred due to superior esthetics provided by them.

 

 
Temporary Crowns: They can be made up of:
  • Acrylic
  • Polycarbonate
  • Stainless steel
They are used for
  • Deciduous teeth because they require less tooth reduction for crown placement and deciduous teeth cannot be reduced to greater extent because of chances of inadvertent pulpal exposure.
  • For permanent teeth, after tooth reduction till the time permanent restoration is being prepared in the lab tooth is covered by a temporary crown for its protection.  

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Comments

  • Jeff

    Jeff 23 - May - 2012, at 11:26 AM

  • Irene, Wow, I can sense your frustration. I am a dental tech and though I was not involved with your smile restoration,what you describe does not sound right. Dentists and Labs are all trying to make it through these tough economic times and it seems that it's ok to provide inferior care and product if it means a profit. Many Dentists today are sending their lab work to China and other destinations in order to get crowns and bridges as less than one-half the cost that we US labs can normally charge. We too have tried to cut costs because the insurance companies are also forcing the dentists to find cheaper restorations. Still, this doesn't excuse what you are dealing with. If it's not right, it's not right.

  • irene hansen

    irene hansen 03 - April - 2012, at 07:50 AM

  • i had a smile makeover with crowns. It took 1.5 years. the dentists couldn't match colors and used three different doctors and labs. they are now turning yellowish grey and the gum line is grey. They are supposed to be all porcelain. I was told they should not stain,but they are. i don't smoke ,drink coffee or any berry stuff. If i have some berries I brush right away I spent way too much money. I had temps on at one time for 6 mos it was gross the smelled and the look they were brown. anyway how can I get a copy of the color they were supposed to use which was b0 that was the closest we could find after they messed up with the first four which i think one of the techs said it was a whitenig shade. I saved up for this a long time I always had a problem with my teeth and wanted to do something nice and they conned me and will not stand behind their work. I think they used the cheapest lab in order to make more money. Please advise if you can. One good thiing is I took pictures when they were first done.

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