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New inorganic-organic copolymers (Ormocer's) for dental applications

: Wolter, H.; Storch, W.; Ott, H.

Cheetham, A.K. ; Materials Research Society -MRS-:
Better ceramics through chemistry VI
Pittsburgh, Pa.: MRS, 1994 (Materials Research Society symposia proceedings 346)
ISBN: 1-558-99246-4
Symposium on Better Ceramics through chemistry <6, 1994, San Francisco/Calif.>
Conference Paper
Fraunhofer ISC ()
dental application; inorganic-organic copolymer; ORMOCERs

Urethane- and thioether (meth)acrylate alkoxysilanes have beenused, as sol-gel precursors, for the preparation of a special family of inorganic/organic copolymers (ORMOCER s). The basic silane type offers the following structuraland synthetic possibilities for modifiying the properties of the resulting copolymers: variation of the number of alkoxy groups, combination with other, different, sol-gel precursors, variation of the number of attached (meth)acrylate groups (1-5), and variation within the molecular segment (kind, structure and length) connecting the inorganic with the organic polymer structure. To achieve the additional organic polymer structure in the cured copolymer the use of different radically induced polymersation approaches is possible. Taking the incorporation of fillers into account, the Young`s modulus of these copolymers is adjustable in a range of 1-17000 MPa, and the thermal expansion coefficient in a range of 17-250]10 -6]K -1(5-50øC). Other advantages are the low shrinkage, the high flexural strength, and the high abrasion resistance. This new copolymer type seems to have significant potential for medical applications, especiallyc as dental filling material to replace the currently used controversial amalgam fillings.