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US 12,390,313 B2Granted
Process for the production of dental milling blanks
AssigneeVOCO GmbH
InventorsAndree Barg, Daniel Oldenburger, Tobias Ebert, Manfred Thomas Plaumann
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Abstract
The present invention relates to a process for producing dental milling blanks, wherein inorganic filler powders are in a first step surface-coated with a silane and wherein in a second step a polymerizable composition is adsorbed on the silanized surface. Subsequent compression and polymerization affords a homogeneous milling blank having very good mechanical properties.
Claims18
A process for producing a dental milling blank comprising the following steps:
- i) producing or providing an inorganic filler powder (F),
- ii) at least partial coating of the surface of the inorganic filler powder (F) by reaction with a silane(S) of formula
- PG-L-Si(R1)n(OR2)(3-n) where
- PG is a polymerizable group,
- L is a linker group that links the polymerizable group PG to the silicon atom
- R1 is a C1 to C4 alkyl group or phenyl group,
- R2 is a C1 to C4 alkyl group or a hydrogen atom,
- n=0, 1 or 2,
- wherein a surface-coated powder (Fsil) is obtained,
- iii) adsorbing on the surface of the filler powder obtained in step ii (Fsil) of a liquid polymerizable composition (M), capable of polymerizing with the polymerizable group PG, wherein a surface-adsorbed powder (Fsil,ads) is obtained,
- iv) filling of the powder obtained in step iii (Fsil,ads) into a mold,
- v) compressing of the powder (Fsil, ads) in the mold under pressure and
- vi) polymerizing of the polymerizable composition M and of the polymerizable groups PG.
10 more elements
Dependencies are inferred from the claim text.