All Ceramic Dental Crowns
All-ceramic dental crowns add beauty to your smile. Ceramic dental crowns, also known as caps, slide over the teeth to hide imperfections in shape, alignment, color, and more. Dental crowns cover and protect cracked teeth, increase comfort, and offer extra support to teeth that are weak or damaged.
If you have old crowns with black lines by the gums, you can trust Dr. Sirakian to craft all-porcelain dental crowns that will vastly improve the overall appearance of your smile.
Types of Ceramic crowns
IPS e.max® Lithium Disilicate Crowns
Ivoclar Vivadent’s patented lithium disilicate material is truly a revolution for the dental industry. Never before has a material been able to combine high strength, high aesthetics, and ease of use into a single product.
IPS e.max is a lithium disilicate glass ceramic that has optimized translucency, durability and strength for full anatomical restorations. Due to the use of new technologies and optimized processing parameters, IPS e.max lithium disilicate has evolved beyond previously available lithium disilicate ceramics.
IPS e.max lithium disilicate restorations exhibit superior durability featuring 360-400 MPa of flexural strength. When fabricated to full-contour, the monolithic structure is the most robust ceramic system tested to date. The opalescence, translucency and light diffusion properties of IPS e.max lithium disilicate were all designed to replicate natural tooth structure for beauty and undetectable restorations.
Zirconia is a very hard ceramic that is used as a strong base material in some full ceramic restorations. The zirconia used in dentistry is zirconium oxide which has been stabilized with the addition of yttrium oxide. The full name of zirconia used in dentistry is yttria-stabilized zirconia or YSZ.
The zirconia substructure (core) is usually designed on a digital representation of the patients mouth, which is captured with a 3d digital scan of the patient, impression, or model. The core is then milled from a block of zirconia in a soft pre-sintered state. Once milled, the zirconia is sintered in a furnace where it shrinks by 20% and reaches its full strength of approximately 850MPa.
The zirconia core structure can be layered with aesthetic Feldspathic porcelain to create the final color and shape of the tooth. Because bond strength of layered porcelain fused to zirconia is not strong, “monolithic” zirconia crowns are often made entirely of the zirconia ceramic with no aesthetic porcelain layered on top.
Zirconia is the hardest known ceramic in industry and the strongest material used in dentistry. Monolithic zirconia crowns tend to be dense in appearance with a high value and they lack translucency and fluorescence. For aesthetic reasons, many dentists will not use monolithic crowns on anterior (front) teeth.
Crowns made of zirconia merged with the porcelain on the outside have a translucency similar to natural teeth, unlike metal cores that block light. The normal too hot/cold sensations that can be felt with other crowns does not normally occur because of reduced thermal conductivity in zirconia. The registered strength for zirconia crowns is near about 1000MPa.