A shutter is a way to restore teeth by restoring its function and a normal form. When a dentist makes a filling, he or she removes first part carried then cleans the cavity created and then filled with a filling material. In the mouth spaces where bacteria may enter the fillings avoid progression, increased tooth decay. The materials used for fillings are gold, porcelain, composites (which have the same color as your teeth) and amalgam (alloy of mercury, silver, copper, tin and sometimes zinc).
What is the best type shutter?
There is no kind of shutter which is best for everyone. The type of shutter is most appropriate for your case will depend on the size of the cavity, your possible allergies to certain materials, the location of the tooth to restore and cost. 
Fillings gold (inlays) - are manufactured in the laboratory and then sealed in the mouth. The gold inlays are well tolerated by the gums and can last more than 20 years. It is for these reasons that gold is regarded by many as the best material shutter. However, it is often the most expensive and requires several appointments.
Amalgam - fillings (silver) resistant to wear and are relatively less expensive. However because of their dark, they are more visible than porcelain or composites and are usually not used in parts discovered during the smile, such as the anterior teeth.
Composites - are matched to the color of teeth and are used when it is looking for a natural look. The compost is placed directly into the cavity where it is hardened by a special light. Composites are perhaps not the ideal material for large fillings because they are fragile and wear over time. They are more likely to be colored by coffee, tea and tobacco and do not last as long as other types of fillings (usually between 3 and 10 years).
Porcelain fillings - these are "inlays" or "onlays" which are manufactured in the laboratory and then glued on the tooth. It is possible to give them the same color as that of adjacent teeth and are resistant to stains. The porcelain restorations usually cover most of the tooth. Their price is similar to that of gold fillings. If a bunt or a fracture has damaged much of the tooth, it may be necessary to achieve a crown. If the decay has reached the nerve there are two solutions: either devitalized tooth (remove the nerve) or a pulp capping the nerve to keep alive.