Condensing instrument for packing and condensing in connection with placement of dental composite resin restorative materials
US4521191A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1984 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Jan 3, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C3/08
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Condensing instruments are used for packing and condensing in connection with placement of dental composite resin restorative materials. These instruments are manufactured in metal or plastic material. Some composite resins however, contain hard particles and require a relatively large condensing pressure which causes abrasion of superficial fragments of prior art metal instruments. These fragments are confined in the restorative material and causes discoloration, often after oxidation. Plastic instruments quickly loose their surface finish, which may render it impossible to perform an adequate condensation. In order to provide an instrument which does not cause discoloration and which guarantees a durable function, at least one functional member (4 and/or 5) of the instrument consists of a metal alloy having a coating (6 and/or 7) of ceramic material which provides the working surface (8 and/or 9) of the functional member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.