Why Is a Dental Crown Needed?
A dental crown may be needed in the following situations:
1. To protect a weak tooth (for instance, from decay) from breaking or to hold together parts of a cracked tooth
2. To restore an already broken tooth or a tooth that has been severely worn down
3. To cover and support a tooth with a large filling when there isn’t a lot of tooth left
4. To hold a dental bridge in place
5. To cover misshapen or severely discolored teeth
6. To cover a dental implant
Ceramic is one of a few materials that do not cause allergy.
Zirconium crowns look beautiful and very natural. Zirconium is an extra tough ceramic material, and it can be made extra thin. They have no metal in them, and can be made translucent or opaque, depending on the demands of the situation. If they are bonded onto the teeth, and not just cemented with conventional dental cement, they won’t show a dark line at the gum-line years later, the way porcelain fused to metal crowns do. Zirconium is 100% bio-compatible and inert, so you don’t have to worry about allergies or adverse reactions.
Strength and Longevity:
- Zirconium is virtually immutable
- Zirconium should last a lifetime
- No black line above gums
- The Zirconium Crowns look more diaphanous
- The Zirconium crowns are milled from a single block of crystal and can be up to five times stronger than a porcelain / metal fuse.
Less tooth Removal:
For example, if a tooth abutment is already voluminous enough, a Zirconium Crown can be used because it provides more strength in less volume than a porcelain crown.
Pressed ceramic is a material like Empress – it is cast in a mold. It is very accurate as far as fit. It is also kinder to the opposing dentition than feldspathic porcelain. Pressed ceramic allows making easy, reliable and aesthetic prostheses/crowns. Pressed ceramic always can solve the problems of teeth aesthetics. Prostheses made of pressed ceramic are done without adding metal frames. It gives the final prosthesis the necessary aesthetic form. Pressed Ceramic Veneers, Crown and Bridgework Pressed ceramic is for veneers, full crowns and anterior bridges (when a 4.0 mm x 4.0 mm connector is achieved). Ceramic inlays and onlays are used when it is necessary to change old vast fillings and prolong the tooth life with little losses for hard tooth tissues. Pressed ceramics do well in situations when greater than 2.0 mm of unsupported ceramics exist. It is also possible to place veneers next to crowns of the same material and achieve a beautiful aesthetic result. Pressed ceramic will suit patients with sensitive teeth.
What metals do we use in crowns?
We use: gold alloy, palladium or a base-metal alloy, for example, nickel or chromium
- less tooth structure needs to be removed with metal crowns
- withstand biting and chewing forces well and probably last the longest in terms of wear down
- rarely chip or break
The metallic color is the main drawback. Metal crowns are a good choice for out-of-sight molars.
Metal Ceramic Crowns
Also called Porcelain Fused to Metal restoration. It consists of a ceramic layer bonded to a thin cast metal coping that fits over the tooth preparation.
Metal Ceramic restoration is stronger than ceramic restoration, since its under structure is made of metal. Metal Ceramic crowns are good choice for either front or back teeth.
Strong enough to stand heavy biting pressure
Have a prime cosmetic appearance
- Aesthetically unpleasant
- Can chip or break off
- Can create wear on those teeth that it bites against
- Black line above gums (due to gums recede the metal can sometimes be visualized as a dark line)
Dental Crowns Ceramic Zirconium Porcelain Metal Pressed Ceramics