Crowns
A crown (also known as a “Cap”) can be made of tooth coloured porcelain, porcelain bonded to metal and also gold. A crown is like a made-to-measure shell that fits precisely over a tooth. You may require a crown if you have a tooth that is badly broken or heavily filled and so by “capping” it it will not only restore its appearance but also make it strong and function again.

All Ceramic EMAX Crown
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 one product, until now.
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. Indeed, compared to other glass-ceramics, e.max demonstrates a strength that is 2.5 to 3 times higher. 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.

Porcelain Bonded to Metal Crown
White porcelain bonded to a metal sub-structure. The metal gives strength whilst the porcelain gives the white colour. Not as natural looking as emax and gradia crowns. The metal substructure may be non – precious or precious metal depending on the patient’s choice. Precious metal is generally preferable as it is more biocompatible with the gingivae (gums) leading to less inflammation and is less prone to corrosion. The weak point here is the bond between the porcelain and metal, and over time the porcelain may break away from the metal. Also, as gums recede with age, a black line may be seen above the crown and this leads to an unsightly smile. This blackness is the metal in the crown. This does not occur with all porcelain/ceramic crowns.

Gold Crown
Metal dental crown. Very strong and durable. Has been a successful restoration for many decades. Has the most similar wear characteristics to natural tooth enamel and therefore is very effective on back teeth, especially in people who grind their teeth. The nature of gold as a material also allows minimal tooth preparation (as it can be formed in thicknesses of less than 1mm), thus preserving more tooth structure
How long do crowns last and how do I care for them?
Crowns are made of inert materials that do not deteriorate over time. However, the underlying tooth is still prone to decay and gum disease. Ceramic on the surface may chip or fracture. Avoid chewing excessively-hard substances like ice or bones. Daily brushing and flossing are essential for maintaining good oral health as well as keeping the crown trouble-free. The most vulnerable portion of the crown is the margin or the junction between tooth and crown. Regular check-ups will enable your dentist to detect any problems with your crown and recommend necessary treatment.
