Amalgam of its hardness is first among other materials. It reaches the most accurate hardness of enamel, although today there are some composite systems are also much closer to those values. The amalgam is not toxic to the dental pulp. Some materials (such as silicate cements.) Operate toxic pulp. Also good advantage is the low price. With its superior durability amalgam other materials nearly doubled. It is stable with large carious defects. When it is necessary to develop large obturation (filling) amalgam tightly seal the defect and prevents the development of secondary caries. Composite fillings have a polymer shrinking, which is greater, the greater the damage. This shrinkage often causes detachment of filling the walls of the tooth and favors the development of secondary caries.
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