摘要:
A hard, resistant material formed by mixing and curinga) at least one polyfunctional silicopolyether,b) at least one monomer which can be subjected to free-radical curing,c) at least one catalyst for polymerization of the free-radical monomers at high temperature, low temperature or under the influence of light, andd) at least one catalyst for the condensation of the silicopolyether.
摘要:
In the preparation of a dental appliance wherein an investment compound is mixed with a liquid and then cast, the improvement wherein the investment compound is a plaster- or phosphate-bound investment compound which is free of an anionic surface-active agent and containing an iso-paraffin of the formula ##STR1## in which n denotes 2, 3, 4 or 5.
摘要:
A method of making a dental impression which comprises applying to the structure of which an impression is to be made a special prepolymer. The prepolymer is composed of units of at least one macrodiol, at least one aliphatic polyisocyanate, and an unsaturated monoalcohol as chain terminator, wherein the average functionality of the prepolymer based on the unsaturated groups is >2.
摘要:
It has been found that silicone resins which contain alkoxy functional groups and harden rapidly in the presence of moisture allow suitable one-component formulations as provisional fixing materials. The hardening rate can be adjusted by addition of suitable activators.
摘要:
In a dental composite containing a polymerizable (meth)acrylic compound, photoinitiator, accelerator, inorganic filler and conventional auxiliaries, the improvement wherein the composite by weight comprises about(a) 10-50% of at least one monomer which contains at least 2 polymerizable (meth)acrylic acid groups,(b) 5-80% of a glass or a glass ceramic which has an average particle size of between about 0.1 and 10 .mu.m and has been post-treated with .gamma.-methacryloxypropyltrimethoxysilane up to a carbon content of between about 0.5 and 2.5% by weight,(c) 2-10% of a surface-treated microfiller and(d) 0.1-5% of a photoactivator consisting of a mixture of camphorquinone and p-dialkylaminobenzenesulphonamide. The composition has a long pot life and good surface color when cured.
摘要:
The present invention relates to investment compounds containing zeolites and to models and moulds made from these. The investment compounds according to the invention are used in metal casting, preferably in the preparation of precision castings.
摘要:
Colored silicone composition comprising:(a) at least one organopolysiloxane,(b) at least one isoparaffin having 8 to 24 carbon atoms, and(c) a dyestuff soluble in (b).
摘要:
The present invention relates to optically clear polysiloxane-based compositions which are employed, in particular, for the production of contact optical articles such as contact lenses, scleral lenses and intraocular lenses.
摘要:
An addition or condensation cross-linking molding or lining compound based on silicones comprising(a) an organo polysiloxane containing reactive end groups,(b) a catalyst,(c) a filler, and(d) an isoparaffin having 8 to 24 carbon atoms.The compounds being particularly useful as dental molding compositions.
摘要:
Impression material in the form of a powder, which, on mixing with water, provides a paste which cures to a solid consistency, the material in the form of a powder being made dust-free by additions of a coating agent, which material is characterized in that it contains paraffin as an additive.