Dental impression silicone composition

A - Human Necessities – 61 – K

Patent

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A61K 6/10 (2006.01)

Patent

CA 2207857

A dental impression silicone composition comprising: (A) 100 parts by weight of an organopolysiloxane having at least two aliphatic unsaturated hydrocarbons in one molecule; (B) from 0.1 to 30 parts by weight of an organohydrogen polysiloxane having at least three hydrogen atoms directly bonded to the silicon atom in one molecule; (C) from 10 to 500 ppm, based on the total amount of the components (A) and (B), of a silicone-soluble platinum compound; (D) from 10 to 500 parts by weight of an inorganic filler; (E) from 5 to 50 parts by weight of a fine silica powder having a BET specific surface area of from 50 to 500 m2/g, whose surface is made hydrophobic; (F) from 0.5 to 50 parts by weight of a nonionic surfactant; and (G) from 10 to 200 parts by weight of a methylphenyl polysiloxane, being disclosed, the invention providing a dental impression silicone composition used for the preparation of oral models that are required in the preparation of dental prostheses in the dentistry, such as crowns, inlays, and dentures, soft in the hardness after setting, large in the strain in compression, good in the wettability against the water content such as saliva, and being so large in the tear strength that the set material hardly comes off.

Une composition de silicone pour empreintes dentaires comprenant : (A) 100 proportions en poids d'un organopolysiloxane contenant au moins deux hydrocarbones aliphatiques non saturés dans une molécule; (B) de 0,1 à 30 proportions en poids d'un polysiloxane organohydrogène possédant au moins trois atomes d'hydrogène directement reliés à l'atome de silicone dans une molécule; (C) de 10 à 500 mg/l, selon la quantité totale des composants (A) et (B), d'un composé de platine soluble dans le silicone; (D) de 10 à 500 proportions en poids d'un agent de remplissage inorganique; (E) de 5 à 50 proportions en poids d'une fine poudre de silice possédant une surface spécifique BET entre 50 et 500 m2/g rendue hydrophobique; (F) de 0,5 à 50 proportions en poids d'un surfactant dispersable; (G) entre 10 et 200 proportions en poids de polysiloxane de méthyle et de phényle. Cette invention forme une empreinte dentaire composée de silicone, utilisée pour la préparation de modèles nécessaires à la fabrication, en médecine dentaire, de prothèses dentaires, telles que des couronnes et des incrustations dont la fermeté est néanmoins douce après le durcissement, la tension est grande lors de compressions, la mouillabilité est bonne contre les liquides, tels que la salive, et la force contre les déchirures est si grande que le matériel durci se détache à peine.

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