| 摘要 |
A method of making a cast product such as a crown for a tooth characterised in that it comprises: 1) forming a sheet of formable material into a product form having the desired shape of the product; 2) producing an investment casting mould from the product form and burning out the product from; and 3) casting the product in the investment casting mould. The invention also includes a method of making a form for use in an investment casting technique which comprises; a) forming a first sheet (10) of formable material to a shape which approximates to the desired shape of the form; b) disposing the formed shape around a layer (12) of deformable hardenable material; c) applying a compressive force to the formed shape to deform the underlying hardenable material to a desired shape; (d) hardening the hardenable material to produce a form precursor (16); (e) removing the formed shape (10) from the hardened form precursor (16); and (f) utilising the hardened form precursor (16) to form a second sheet (18) of formable material into the form of the desired shape. |
