Shade-coordinated, veneering porcelain system for dental prostheses
The invention is related to a shaded porcelain system that contains two types of veneering porcelains: natural enamel/dentin body and opal enamel, as well as stain & glaze porcelain, with CTE that are compatible to and which can be used for veneering a dental prosthesis made of 1) lithium disilicate-based glass-ceramic substructure that is formed by hot pressing or CAD/CAM machined process or 2) YTZP zirconia-based ceramic substructure that is formed by CAD/CAM machined process in order to improve overall esthetics of final prosthesis.
1. A shade-coordinated porcelain system for a lithium disilicate-based glass-ceramic and/or YTZP zirconia-based ceramic substructure, comprising:
(i) a natural enamel/dentin body having a composition that includes:
Natural Enamel/
Oxide
Body White (wt %)
SiO 2
60-65
Al 2 O 3
10-13
Na 2 O
5-7
K 2 O
6-9
Li 2 O
1-3
CaO
0-2
BaO
2-4
MgO
0.5-1
CeO 2
0.5-1
Sb 2 O 3
0.5-1
Tb 2 O 3
0.5-1
TiO 2
0-1
SnO 2
0
B 2 O 3
3-5
ZrO 2
0.5-1
P 2 O 5
0.5-1
F
0.5-1
Total
100
(ii) an opal enamel having a composition that includes:
Oxide
Opal Enamel (wt %)
SiO 2
58-63
Al 2 O 3
10-13
Na 2 O
5-8
K 2 O
6-9
Li 2 O
1-3
CaO
1-3
BaO
1-3
MgO
0.05-1
CeO 2
0.05-1
Sb 2 O 3
0.05-1
Tb 2 O 3
0.05-2
TiO 2
0-1
SnO 2
0.05-1
B 2 O 3
3-6
ZrO 2
0.05-1
P 2 O 5
0.05-1
F
0.05-1
Total
100
and
(iii) a stain and/or glaze porcelain having a composition that includes:
Oxide
Stain and/or Glaze (wt %)
SiO 2
58-63
Al 2 O 3
10-13
Na 2 O
5-8
K 2 O
4-10
Li 2 O
1-3
CaO
1-3
BaO
2-6
CeO 2
0.05-1
Sb 2 O 3
0.005-1
Tb 2 O 3
0-2
TiO 2
0-1
B 2 O 3
5-12
Total
100
wherein the natural enamel/dentin body, the opal enamel, and the stain and/or glaze porcelain are thermally compatible to the substructure and have a CTE in the range between 8.8 ppm/° C. and 9.5 ppm/° C. @ 500° C. and
wherein the CTE of the natural enamel/dentin body and the opal enamel is achieved after firing the shade-coordinated porcelain system at a temperature in the range between 680° C. and 800° C.
2. The shade-coordinated porcelain system of claim 1 , wherein the lithium disilicate-based glass-ceramic substructure has a CTE in the range of 9.5 ppm/° C. and 10.5 ppm/° C. @ 500° C.
3. The shade-coordinated porcelain system of claim 1 , wherein the YTZP zirconia-based ceramic substructure has a CTE in the range of 10.0-11.0 ppm/° C. @ 500° C.
4. The shade-coordinated porcelain system of claim 1 , wherein the CTE of the natural enamel/dentin body, the opal enamel, and the stain and/or glaze porcelain is achieved after firing the shade-coordinated porcelain system at a temperature in the range between 720° C. and 800° C.
5. The shade-coordinated porcelain system of claim 4 , wherein the CTE is achieved after the firing the shade-coordinated porcelain system at a temperature 50° C. lower than the firing temperature of natural enamel/dentin body.
6. The shade-coordinated porcelain system of claim 4 , wherein the CTE is achieved after firing the shade-coordinated porcelain system at a temperature 50° C. lower than the firing temperature of the opal enamel porcelain.
7. The shade-coordinated porcelain system of claim 4 , wherein the CTEs of the natural enamel/dentin body or the opal enamel porcelain and stain and/or glaze porcelain are in the range between 9.0 ppm/° C. and 9.5 ppm/° C. @ 500° C. and the porcelain firing temperatures are in the range between 750° C. and 770° C.
8. The shade-coordinated porcelain system of claim 1 , wherein the CTE of the natural enamel/dentin body, the opal enamel, and the stain and/or glaze porcelain is achieved after firing the shade-coordinated porcelain system at a temperature in the range between 740° C. and 780° C.