What is dental crown?
Crown or fixed dental prosthodontics which called “dental crown” in English, metal or ceramic cap or combination of both, placed on wounded teeth in order to restore the function and beauty of tooth, in addition protecting them from breaking.
Types of dental crown
- Full metal crowns
As you see the name, the entire tooth cover is made of metal, which can be white or yellow depending on metal type including in alloy. The disadvantages of that is ungraceful appearance which is less used today. What is standard in variety of dental coverings as standard gold is this type of crown. 60% of this alloy include precious metals (gold, platinum and sometimes palladium) which is over 40% of gold. This is commonly referred to as “gold tooth” in community
- Ceramic crowns
As it shows from name, it is used in fabricating ceramic crowns like porcelain
:Types of ceramic crowns
1-2 Crowns (PFM- ceramic and metal composition)
Ceramic and metal composition crowns which are used today as a crown and are used in dental office is kind of crown. Actually, metal part covers around tooth as the core, causes strength of crown and porcelain it will lead to better beauty. In fact a combination of beauty and strength.
2.2 zirconium crowns
Zirconium crown is one of full crown which reinforced with the help of zirconium frames. It is structurally similar to PFM. The different is instead of using metal in center of zirconia crown, zirconium is used which has white color but its strength is as high as or even higher than metal alloys.
2-3 IPS crowns
By the advancement of dental materials technology, instead of a metal frame, they have reinforced ceramic core that doesn’t have enough translucency in metal frame and at the same time is capable of supporting the outer breakable layer. IPS empress and in- ceramic crowns are examples of this crowns. Recently E-max crowns, fabricating 2IPS impress or exam which has perfect beauty in front teeth and natural tooth appearance.
Selecting proper crown is essential for providing beauty and stability of damaged teeth.
What is the best type of tooth crown?
The best type of tooth crowns are All-metal crowns with precious crowns in other words, full-gold crowns doesn’t provide beauty. After these zirconia teeth crowns are in high quality and strength. E-max crowns are best select in front teeth.
When does tooth need crown?
1. in root canal treatment 2.undesirable color of tooth 3. Beauty reasons 4.some times for arranging
What are post and core?
When the tooth is root canal therapy and more than50% of tooth crown is loss, an impression is taken from root of tooth and sent to laboratory. In second session, casting metal crown that fabricated by dental laboratory, cemented on patients tooth and then used for providing crown.
In case of tooth decay, you should do post and core before crown
