Polymer-Based Burn-Out Material For The Lost-Wax Technique
AssigneeIvoclar Vivadent AG
InventorLorenz Josef Bonderer
Life of this patent
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Abstract
Modelling material which includes (a) at least one radically polymerizable monomer, (b) at least one initiator for the radical polymerization and (c) at least one inert component. The inert component (c) is soluble in the polymer formed by polymerization of the monomer (a), wherein the solubility of component (c) decreases as the temperature increases, with the result that a phase separation takes place above a particular temperature. The material is suitable in particular for the production of models of dental restorations for investment casting processes.
Claims25
Process for the production of dental restorations in which,
- (A) a model of a tooth to be restored or of teeth to be restored is moulded, wherein the model is fabricated of a composition comprising a radically polymerizable composition which comprises
- (a) at least one radically polymerizable monomer,
- (b) at least one initiator for the radical polymerization and
- (c) at least one inert component,
- characterized in that the inert component (c) is soluble in the polymer formed by polymerization of the monomer(s) (a), wherein the solubility of component (c) decreases as the temperature increases, with the result that a phase separation takes place above a particular temperature,
- (B) the model is then invested in an investment material,
- (C) after the investment material has set, the invested model is heated in a furnace so that the modelling material is completely removed from the mould,
- (D) an alloy or a ceramic or glass ceramic material is poured or pressed into the mould.
Process for the production of a model of a dental restoration using a radically polymerizable composition which comprises
- (a) at least one radically polymerizable monomer,
- (b) at least one initiator for the radical polymerization and
- (c) at least one inert component,
- characterized in that the inert component (c) is soluble in the polymer formed by polymerization of the monomer(s) (a), wherein the solubility of component (c) decreases as the temperature increases, with the result that a phase separation takes place above a particular temperature.
Dependencies are inferred from the claim text.