Generally can be divided into the silver metal material and the tooth color material two categories. Different materials have different properties; it will be used in different situations.
The filling material should be non-toxic, wear, compressive strength, after filling the volume does not change, and nest holes close together, saliva corrosion or dissolved easy operation and beautiful color performance. But not yet fully meet the above performance of the material can only be based on tooth defect site by the force size and aesthetic requirements of dental equipment a more appropriate choice of filling materials. Generally more posterior teeth with amalgam, the front teeth, affect the appearance of multi-site selection of the resin.
1. Silver amalgam. A malleable paste, hardened after 15 minutes, 24 hours, completely hardened. Amalgam of silver, before filling teeth unsightly; there are thermal conductivity, so the deeper the cavity cements bottom, in order to avoid conduction temperature to stimulate the pulp.
2. Composite resin. The color is beautiful, easy to operate, there is a strong adhesion with the enamel. Because of poor wear resistance, and Children more than adults need dental check more for the front teeth.
3. Cement powder class. Zinc-phosphate cement based on zinc oxide powders with phosphoric acid-based liquid made to reconcile, adhesion, but not strong enough, and can dissolve in saliva, it is not suitable as a permanent filler used for filling silver bottom of the amalgam when, or for filling of deciduous teeth.
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