3 Types of Porcelain Crowns
3 TYPES OF PORCELAIN CROWNS
WHAT IS DENTAL PORCELAIN?
Dental Porcelain is a material that is versatile when it comes to appearance and strength. There is a wide range when it comes to strength–at 200-1100 megapascals (MPa). Depending on the type of porcelain selected, the dental technician can prioritize looks or durability.
Lithium disilicate is a cosmetic material used for porcelain crowns. It can either be pressed or milled. For aesthetic anterior teeth, lithium disilicate is the preferred material. It can be used for minimally invasive restorations as thin as 0.2 millimeters (mm). In either technique of fabrication, the material can be done as a monolithic or micro-layered restoration, the latter being the most cosmetic choice. Recent studies have shown that lithium disilicate results in a strength of approximately 500 MPA. On the other hand, milled lithium disilicate has a strength of 400 MPa. It is beneficial to acid etch before cementation to achieve the ultimate bond strength.
Zirconia is a ceramic material known for its combination of strength and aesthetics that is manufactured in many different variations: Full strength, pre-shaded full strength, anterior esthetic, and pre-shaded multi-layered esthetic, to name a few. Full strength, when processed as a monolithic crown possesses the highest flexural strength of any ceramic restoration at 1100 MPa. Milled through CAD/CAM software, zirconia still remains gentle enough to protect the opposing dentition against excessive wear due to its stringent manufacturing processes. . Esthetic zirconia has an average flexural strength of 650 - 850 MPa. In addition, this material has enhanced light-transmitting abilities, resulting in high translucency and lifelike restorations. Lastly, layered zirconia uses a conventional framework design that is finished with feldspathic-based porcelain. Layering porcelain allows the technician to achieve custom shading, intrinsic characterization, and varying degrees of translucency. However, strength comes at a cost when prioritizing aesthetics with this material. The average flexural strength of Layered Zirconia is 200 MPa.
Porcelain-fused-to-metal crowns are created by covering a strong metal base with a porcelain veneer. The strength of the metal base provides more durability while the porcelain veneer allows for an aesthetic appearance. Clinical studies have shown that PFMs can last at least 10 years over 94 percent of the time. With proper and correct care, they can last up to 20 years. Today, PFM crowns are used more often than all-porcelain because of the added wear and tear resistance. PFM crowns used to cover 83 percent of the total crown fabrication around 15 years ago. However, the percentage has been reduced by about half, mainly contributing to the emergence of stronger materials that do not need a metal base. Despite this, PFM crowns are still among the top three when it comes to fabricating dental crowns. The disadvantage of PFM crowns is that a gray line is possible at the gumline because of the meal base. It’s less aesthetic than an all-porcelain crown. For bruxers or teeth clenchers, this crown is more likely to wear faster and more aggressively against the opposing teeth.
How Can The Dental Lab Help?
The Dental Lab specializes in all three types of porcelain crowns. We can deliver our all-porcelain crowns in 5-7 business days. In addition, our porcelain-fused-to-metal restorations are typically delivered in 10-12 business days. For a larger scope of our products and services view our Products & Services tab on our website. For questions or concerns, please do not hesitate to contact us.
The Dental Lab, Dental Lab, Porcelain, Porcelain Crowns, Lithium Disilicate, Emax, IPS eMax, Dental Crown, Dental Crowns, PFM, Zirconia, Zirconia Crowns
It's great to know that porcelain tooth crowns would have a strong metal base combined with porcelain veneers. I will suggest this to my sister because she might already need this kind of treatment for her damaged molar tooth. It has been like that for two years now, and she only got the budget this year to have the right kind of treatment to make her life easier whenever she eats or even speaks.
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