Crown and/or bridge tooth replacement
What is a crown?
A crown is a tooth replacement that covers the whole surface of a tooth and which corresponds in colour and shape to the original whole tooth.
It is prepared in a dental laboratory and the aim is to restore the original shape of the tooth. A bridge is made if there are teeth missing or teeth that are adjacent to each other are so badly damaged that there isn`t any other way to restore them.
When do we need a crown or a bridge?
We make a crown for a tooth when it cannot be saved using a filling. For example in cases when the tooth becomes too fragile after root canal treatment or teeth are broken after an accident or when the teeth are modified to buttress a row of teeth. Another case is when the tooth has suffered so much decay that there isn`t any other way to save it or it has been worn down so much that this is the only aesthetically satisfactory option.
So to summarise, we need a crown or a bridge:
– if three or more surfaces of a tooth are decayed
– if there is a root filled tooth
– for aesthetic reasons
– when there are teeth missing
What is the crown made of?
Every crown and bridge has a frame, which can be:
– porcelain on a metal frame
– porcelain on pressed ceramic
– porcelain on a Zirconium frame
The metal frame is made using a metal alloy used in dentistry (Chromium-Cobalt), or dental gold and on this frame the dental technician fires a ceramic material that poses no risk to health.
The use of a Zirconium oxide frame is recommended for a more aesthetically pleasing result or when the patient has an allergy.
The all-ceramic crowns are usually made for aesthetic reasons for the front teeth, not for the back teeth.
When is it contraindicated?
In those cases when the tooth is very loose, the root has received substandard treatment, if there is a lot missing from the crown or if the tooth is inflamed.
The use of a crown is not recommended for children under 16. The pulp chamber of a child is still too large, as a result there is a greater probability that root canal treatment will be needed when the crown is being made.
How is a crown made?
Check-up and treatment plan.
We always explain to the patient what irregularities we have found and then we discuss what needs to be done and the different stages of the treatment.
We give them a detailed price offer, which the patient takes with them.
The patient is given an anaesthetic, then the teeth are polished, taking care to remove the same amount of material from every side of the tooth.
Our dentists strive to polish the tooth shoulder, of course making allowances for its state.
In so doing they ensure long-term protection for the tissues surrounding the tooth (gums, periodontium) and provide a better appearance, in contrast to traditional polishing methods.
After this we take an imprint, using a special silicon material, from which we make the temporary tooth replacement.
This temporary replacement is needed, because the teeth that have been polished are sensitive, so that while the tooth replacement is being made the patient does not suffer pain or discomfort. Another reason for the preparation of the temporary bridge or crown is aesthetic considerations.
We place the frame of the crown or bridge on the pre-prepared tooth, ensuring that it fits perfectly.
At the same time we decide on the colour of the replacement tooth that is being made with the help of a tooth colour key, consisting of 24 colours, so that it harmonizes with the colour of the existing teeth.
The replacement tooth, which harmonizes in both shape and colour with the existing teeth, undergoes the final fitting, using a special dental cement.
To make your decision easier, you should consider the following:
For replacing missing side teeth, it is definitely worth choosing the solution involving a frame under the porcelain covering, for instance a metal or zirconium frame. Neither the metal nor the zirconium allows light to pass through it, unlike the ceramic covering, which does. So it is not without importance whether a metalic, greyish surface is under it, or a surface like chalk, resembling the colour of the tooth. But the all-ceramic crown should in no case be considered.
We recommend it, however, for crown replacements for front teeth, but it is not suitable for replacing missing teeth. Its special advantage is that it is translucent and it can be made so that its colour can be similar to that of the existing teeth.
Metalic ceramic or zirconium?
The crown with a base of zirconium oxide, which is made using CAD/CAM technology is one of the great achievements of modern dentistry and which completely satisfies every aesthetic and functional demand. If the patient is allergic to metal, they should choose this type of tooth replacement. Using this technology, the model that is made from the imprint taken from the previously prepared teeth is scanned using a specially developed scanner and recorded in a computer. This allows the dental technician, with the aid of a special machine, to carve a crown/bridge from a block of zirconium. The only disadvantage is that it is much more expensive than a metal ceramic tooth replacement.
They look more attractive then the metal ceramic ones, because they do not contain any metal and so look a lot more natural. But tooth replacements containing metal always seem more compact.