Unlike veneer, a crown covers the entire tooth and restore lost anatomical shape, function and aesthetics.
When do I require a crown?
Crown is recommended in the following cases:
1. Damaged tooth.
2. Heavily restored tooth.
3. Dysplastic tooth.
4. Worn tooth.
Types of crowns
All Porcelain and All Ceramic Crowns
 Feldspathic Porcelain crown
 Empress crown
 Procera crown
 Lava crown
Translucent Zirconia is used as core material and an outer layer is baked for better aesthetics. This crown can be cemented directly instead of bonding.
 Zirconium crown
 IPS-Emax Crowns
After care instructions
 Routine oral hygiene care should be followed including using floss and interdental toothbrushes where required.
 Need to visit hygienist regularly to maintain good oral hygiene.
Advantages of All-Porcelain and All-Ceramic crowns
 Highly compatible and no allergies.
 Some ceramics are very tough and fracture resistant.
 No unsightly metal margins like Porcelain fused to metal (PFM).
Disadvantages of All-Porcelain and All-Ceramic crowns
 All–Ceramic crowns need more tooth reduction to accommodate ceramic core and porcelain which is not desirable.
 As some ceramics are tough and fracture resistant, they can be quite abrasive against the teeth present in the opposing arch.
Porcelain fused to metal crowns (PFM)
PFM crowns have been the first choice for many years to restore the damaged and diseased teeth and these crowns are more affordable. These crowns have a metal shell (core or substructure) and 1.5mm to 2m layers of porcelain is fused over this core to give the shape and colour. The metal framework (core) is very strong and it is a combination of different alloys. The porcelain layer can withstand the chewing forces exerted in the mouth.
Types of PFM’s
2. Porcelain fused to gold alloys.
3. Porcelain fused to titanium alloys.
Advantages of PFM
2. The high rate of success in the long run.
3. Very stable.
Disadvantages of PFM’s
1. Cannot truly mimic the look of a natural tooth and does not give a perfect smile.
2. Metal margins are visible if gums recede and look unsightly especially in the anterior region.
3. Needs a lot of tooth reduction to accommodate the metal substructure and porcelain.
4. Can cause gingivitis if the margins are not placed properly.
Claremont Dental Practice,
1-3 Terminus Buildings,
Claremont Road,BN25 1NT
Tel: 01323 897502
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