Method for molding dental restorations and related apparatus
First Claim
1. A dental restoration which is formed from a glass-ceramic material, which does not deform during heat treating, comprising the following composition (by weight percent),
wherein said dental restoration is further altered by applying one or more layer(s) of a porcelain material to said dental restoration and fusing said porcelain layer(s), wherein the C.T.E. of said porcelain material is slightly less than the C.T.E. of the glass ceramic material.
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Abstract
The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. In this invention, a dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is then applied to the crucible in order to bring the glass-ceramic material to a working range at temperatures above its liquidus temperature. The crucible in which the glass-ceramic material is placed has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic material being heated. The heat deformation properties of the crucible must be such that when the glass-ceramic material in the crucible is in the working range the crucible is heat-pressure deformable without rupturing. Once the glass-ceramic material is heated to its working temperature, the crucible is brought into contact with a mold having a preformed cavity therein, the cavity being in the shape of the desired dental restoration. As the distance between the heated glass-ceramic material and the mold is decreased, the crucible is deformed to form a seal with the mold thereby facilitating the injection of the molten glass-ceramic material into the mold cavity. An interactive seal between the crucible and the mold may be provided for. The composite process may be carried out in a vacuum. The resulting dental restoration has superior optical esthetic and strength properties. The invention further includes the heat-pressure deformable crucible.
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Citations
4 Claims
- 1. A dental restoration which is formed from a glass-ceramic material, which does not deform during heat treating, comprising the following composition (by weight percent),
- space="preserve" listing-type="tabular">______________________________________ Li.sub.2 O 8-15 Al.sub.2 O.sub.3 1.5-5.0 SiO.sub.2 60-85 Na.sub.2 O 0-2 K.sub.2 O 0-2 P.sub.2 O.sub.5 1.5-5 ZrO.sub.2 0-3 CaO 0-1 BaO + SrO + LaO 0-12 Coloring Oxides 0-5 ______________________________________
wherein said dental restoration is further altered by applying one or more layer(s) of a porcelain material to said dental restoration and fusing said porcelain layer(s), wherein the C.T.E. of said porcelain material is slightly less than the C.T.E. of the glass ceramic material.
- 2. A dental restoration which is formed from a glass-ceramic material which does not deform during heat treating, comprising the following composition (by weight percent),
- space="preserve" listing-type="tabular">______________________________________ Li.sub.2 O 10-13.5 Al.sub.2 O.sub.3 2-3 SiO.sub.2 70-84 K.sub.2 O 0-1 P.sub.2 O.sub.5 1.5-4 ZrO.sub.2 0-1 Ba + SrO + LaO .5-4 CaO 0-1 Coloring Oxides 0-5 ______________________________________
wherein said dental restoration is further altered by applying one or more layer(s) of a porcelain material to said dental restoration and fusing said porcelain layer(s), wherein the C.T.E. of said porcelain material is slightly less than the C.T.E. of the glass ceramic material.
- 3. A dental restoration of which is formed from a glass-ceramic material, which does not deform during heat treating, comprising the following composition (by weight percent),
- space="preserve" listing-type="tabular">______________________________________ Li.sub.2 O 9-13 Al.sub.2 O.sub.3 1.5-4 SiO.sub.2 65-84 Na.sub.2 O 0-1 K.sub.2 O 0-1 P.sub.2 O.sub.5 1.5-4 ZrO.sub.2 0-1 BaO + SrO + LaO 0-12 CaO 0-1 Coloring Oxides 0-5 ______________________________________
wherein said dental restoration is further altered by applying one or more layer(s) of a porcelain material to said dental restoration and fusing said layer(s) wherein the C.T.E. of said porcelain material is slightly less than the C.T.E. of the glass ceramic material.
- 4. The dental restoration which is formed from a glass-ceramic material, which does not deform during heat treating, comprising the following composition (by weight percent),
- space="preserve" listing-type="tabular">______________________________________ Li.sub.2 O 10.5 Al.sub.2 O.sub.3 2.5 SiO.sub.2 78.5 K.sub.2 O 0.5 P.sub.2 O.sub.5 2.0 ZrO.sub.2 0.5 TiO.sub.2 0.1 CeO 0.35 NiO.sub.2 .02 BaO 3.0 Coloring Oxides 2.03 ______________________________________
wherein said dental restoration is further altered by applying one or more layer(s) of a porcelain material to said dental restoration and fusing said layer(s), wherein the C.T.E. of said porcelain material is slightly less than the C.T.E. of the glass-ceramic material.
Specification
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- Resources
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Current AssigneeTEC Ventures, Inc.
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Original AssigneeTEC Ventures, Inc.
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InventorsPetticrew, Richard W.
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Primary Examiner(s)Bonner, Melissa
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Application NumberUS08/417,682Time in Patent Office999 DaysField of Search106/35, 501/2, 501/5, 501/7, 501/63, 501/69, 501/70, 501/68US Class Current106/35CPC Class CodesA61C 13/20 Methods or devices for sold...B28B 1/24 by injection moulding injec...B28B 5/04 in moulds moved in successi...C03C 10/00 Devitrified glass ceramics,...C03C 3/097 containing phosphorus, niob...C03C 4/0021 for dental useY10T 428/13 Hollow or container type ar...
