Methods for forming dental prosthesis
US4886456A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1988 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | May 10, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C8/005
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dental prosthesis is formed by attaching an internally threaded sleeve to a post by means of a heat-meltable material. A dimensionally stable, heat-meltable material is applied to the post and around the sleeve. The heat-meltable materials are melted and replaced by a permanent material. A screw is inserted into the sleeve prior to the melting step. The melting and replacing steps comprise steps in an investment-type casting procedure wherein a unit comprised of the post, the sleeve, the screw, and the heat-meltable materials is embedded in an investment material such that a head of the screw is embedded in the investment material to maintain the positional relationship of the sleeve relative to the post during the melting step. A release material is applied over a body defined by the permanent material. A dimensionally stable, heat-meltable material is applied over the release material and is melted and replaced with a permanent material which forms an overlay capable of being removed upon removal of the screw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.