Repair of dental defects with artificial substances. For repair substance called a filling material. Where dental caries, wedge-shaped defects, trauma caused by the defect of tooth structure needs to repair, to restore its shape and function. When the disease has spread to the pulp, and even cause periapical disease, treatment of the pulp, and re-fillings. Fillings including cavity preparation and filling of two main steps.
The choice of filling material of the filling material should have a 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 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). Composite resin. The color is beautiful, easy to operate; there is a strong adhesion with the enamel. Because of poor wear resistance, and more for the front teeth.
(2). 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. Polycarboxylate cement powder compared with zinc phosphate cement powder, high strength, adhesive strength, low solubility and stimulating effect on the pulp, non-toxic, use with zinc phosphate cements with.
(3). Silver amalgam. Alloy powder and mercury from silver (65%), tin (25%), copper (6%), and zinc (2%) than the 5:8 of weight. Mixing finely ground. A malleable paste, hardened after 15 minutes, 24 hours, completely hardened. Filling should be dental instruments completed within 15 minutes, 24 hours after filling in order to exercise the functions of chewing. 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. In recent years, has successfully developed the high-copper alloy, to increase the copper content in the alloy, reducing the silver content. Can improve the corrosion resistance, increase strength, and reduce the volume change.
Prone to the problem of filling fillings must be familiar with dental anatomy and morphology of the pulp chamber and the relationship between the two, in order to avoid pulp exposure in the preparation of the cavity. Deep lesions close to pulp, you must Now popular porcelain teeth explicitly determine whether the cause of pulp disease. The diagnosis is not clear that line fillings, often caused by postoperative pain. Not involving the pulp lesions, do not free to endodontic treatment, in order to avoid excessive tooth damage.
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