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Saturday, December 29, 2007

Materials used for the dental caries treatment.

Saturday, December 29, 2007

The underlying principle of the dental caries treatment is a careful removal of carious, softened parts of dentine and providing for sufficient retention and resistance of a filling. Filling materials used in restorative stomatology practice can be divided into two classes: temporary and permanent. To isolate the pulp from thermal and chemical irritation, zinc oxide - phosphate, carboxyl or zinc oxide - eugenol cements are used as bases. Zinc oxide - phosphate cement is used also for root canals filling before a surgery (apicectomy) and for cementing during prosthetic works. Zinc oxide - phosphate cement is often used as a temporary filling material , e.g. as a cavity closure after the pulp necrotizing compounds or disinfecting dressings have been applied.

Permanent fillings are either plastic (that solidify after filling into a prepared cavity) or cast (made in a laboratory according to a previously taken impression). The major requirements for filling materials are their volume, mechanical and chemical stability, they have to be non-irritating, and should provide for an esthetic appearance in the frontal sections of the dentition. Amalgam is the most widely used plastic filling for the lateral sections of the dentition. It is prepared as a mixture of a metal powder (containing various weight parts of silver, zinc and copper) with mercury. Pleasantly looking composite filling materials are used at the frontal sections of the dental arch (Evicrol brand). These materials meet the requirement of a perfect seal of a prepared cavity, they adhere well directly onto hard dental tissues and they are color stable. Cast fillings are usually made of precious dental metals (gold). Due to its disturbing appearance they are used mainly at the lateral sections of the dentition.


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