CROWNS:-
A crown is an artificial restoration that fits over the remaining part of a prepared tooth, making it strong and giving it the shape of a natural tooth. Crowns are an ideal restoration for teeth that have been broken, or have been weakened by decay or a very large filling. They can be made of porcelain or gold or a combination of these materials.

A dental crown could be used for a number of other reasons

• To mask discoloured fillings
• Retaining large fillings
• Post root canal treatment
• To hold a bridge or denture firmly in place

BRIDGES:-
There are two main ways to replace missing teeth, without surgical intervention. The first is with a removable false tooth or teeth - a partial denture. The second is with a fixed bridge. Bridges were usually made of a precious metal base. If the bridge is in the line of vision, porcelain is then bonded to the base. Today zirconia is the choice of material both in the esthetic and non esthetic zone.

The  gap left by a missing tooth puts greater strain on the teeth at either side. A gap can also mean your ‘bite’ is affected, because the teeth next to the space can lean into the gap and alter the way the upper and lower teeth bite together. This can then lead to food getting packed into the gap, which causes both decay and gum disease.

DENTURES:-
A denture is a removable replacement for missing teeth and surrounding tissues. Two types of dentures are available
1.Complete dentures – when all teeth are missing. They can be either conventional or immediate.
Conventional dentures are placed eight to twelve weeks after the teeth have been removed. Immediate dentures are made in advance and can be positioned as soon as the teeth are removed. However, these require more adjustments to fit properly during the healing process and should be considered until conventional dentures can be made.
2.Partial dentures – when some natural teeth remain. A removable partial denture consists of replacement teeth attached to a pink or gum – coloured plastic base, which is sometimes connected by metal framework that holds the denture in place in the mouth.
The aim of a complete denture is to restore form, function and esthetics. Success of a complete denture firstly depends on a good intra oral diagnosis. New dentures may feel odd or loose for a few weeks until the muscles of the cheeks and tongue learn to keep them in place. Minor irritation or soreness, Increase in the salivary flow, discomfort while chewing, difficult in pronouncing certain words are some of the most commonly encountered problems, which tend to diminish over a period of time.

OVER DENTURES:-
Over dentures, like complete dentures, are replacement teeth, retained by tooth, roots of teeth or implants. They offer superior comfort than conventional complete dentures. One of the biggest advantage of overdentures is that slows bone loss by stimulating the bone.
Whether retained by remaining natural teeth or by dental implants, it will continue to stimulate your jaw bone when you eat/chew. This stimulation will slow or even stop the resorption (shrinkage) process that is natural when teeth are missing. They are stable, eliminates unnecessary movement during chewing and talking.