Claims
- 1. An artificial tooth crown for attachment to a tooth of a dental patient, comprising a body consisting of a glass ceramic, wherein said glass ceramic comprises a generally transparent glass matrix and at least 30% by volume of crystallized calcium phosphate crystals, said body being prepared by casting followed by crystallization at a temperature of between about 800.degree. and 900.degree. C.
- 2. An artificial tooth crown according to claim 1, wherein said glass ceramic is based on SiO.sub.2 --P.sub.2 O.sub.5 --CaO--MgO and CaF.sub.2.
- 3. An artificial tooth crown according to claim 2, wherein said glass ceramics has a linear expansion coefficient of 9-11.times.10.sup.31 6 /.degree. C.
- 4. An artificial tooth crown according to claim 2, wherein a first reinforcing member piece comprising ceramics or metal and having an expansion coefficient similar to that of said glass ceramic is embedded almost vertical to an occlusal direction.
- 5. An artificial tooth crown according to claim 4, wherein said first reinforcing member has at least one transverse through hole and said glass ceramic passes therethrough.
- 6. An artificial tooth crown according to claim 4, wherein said first reinforcing member comprises alumina or zirconia ceramics.
- 7. An artificial tooth crown according to claim 4, wherein said first reinforcing member comprises a metal selected from the group consisting of Pd, Pd alloys, Ti and Ti alloys.
- 8. An artificial tooth crown according to claim 4, further comprising a second reinforcing member piece comprising ceramics or metal and having an expansion coefficient similar to that of said glass ceramic, wherein said second reinforcing member piece is embedded almost vertical to an occlusal direction.
- 9. An artificial tooth crown according to claim 8, wherein said second reinforcing member has at least one transverse through hole and said glass ceramic passes therethrough.
- 10. An artificial tooth crown according to claim 8, wherein said second reinforcing member comprises alumina or zirconia ceramics.
- 11. An artificial tooth crown according to claim 8, wherein said second reinforcing member comprises a metal selected from the group consisting of Pd, Pd alloys, Ti and Ti alloys.
Priority Claims (1)
Number |
Date |
Country |
Kind |
58-178962 |
Sep 1983 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 06/922,825 filed on Oct. 22, 1986, now abandoned, which in turn is a continuation of application Ser. No. 06/654,654 filed on Sept. 25, 1984, now abandoned.
US Referenced Citations (21)
Foreign Referenced Citations (2)
Number |
Date |
Country |
51-8970 |
Mar 1976 |
JPX |
191252 |
Nov 1982 |
JPX |
Continuations (2)
|
Number |
Date |
Country |
Parent |
922825 |
Oct 1986 |
|
Parent |
654654 |
Sep 1984 |
|