Veneer ceramic for dental restorations and method for veneering dental restorations
The invention is directed to veneer ceramics for dental restorations of framework ceramics comprising yttrium-stabilized zirconium dioxide. It is the object of the invention to make possible a translucent veneer ceramic which has high flexural strength as well as excellent adhesion to the framework ceramic of yttrium-stabilized zirconium dioxide. According to the invention, this object is met in a veneer ceramic for dental restorations made of yttrium-stabilized zirconium dioxide which is produced from the following components: a) SiO 2 58.0-74.0 percent by weight b) Al 2 O 3 4.0-19.0 percent by weight c) Li 2 O 5.0-17.0 percent by weight d) Na 2 O 4.0-12.0 percent by weight e) ZrO 2 0.5-6.0 percent by weight.
1. Method for veneering dental restorations comprising yttrium-stabilized zirconium dioxide with a veneer ceramic comprising the following components
a)
SiO 2
58.0-74.0 percent by weight
b)
Al 2 O 3
4.0-19.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-12.0 percent by weight
e)
ZrO 2
0.5-6.0 percent by weight,
and comprising lithium disilicate as a main crystal phase, characterized by the following method steps:
a) a glass fused at 1530° C. and comprising the following components
SiO 2
58.0-74.0 percent by weight
Al 2 O 3
4.0-19.0 percent by weight
Li 2 O
5.0-17.0 percent by weight
Na 2 O
4.0-12.0 percent by weight
ZrO 2
0.5-6.0 percent by weight,
is fritted in water;
b) the fritted glass is tempered for nucleation at a temperature of 500° C. to 680° C. for 2 to 6 hours;
c) after cooling, the tempered glass is mechanically pulverized;
d) the pretreated powder is converted to paste with the addition of water;
e) the paste is applied to the restorations comprising yttrium-stabilized zirconium dioxide and
f) is then subjected to a heat treatment at 800° C. to 940° C., wherein lithium disilicate is crystallized out as main crystal phase to form the veneer ceramic.
2. Method according to claim 1 , characterized in that lithium aluminum silicate and lithium titanium oxide silicate Li 2 TiOSiO 4 are also crystallized out in addition to the lithium disilicate.
3. Method according to claim 1 , characterized in that a crystalline addition comprising pulverized lithium disilicate which was produced by a solid state reaction is added to the fritted glass.
4. Method for veneering dental restorations comprising yttrium-stabilized zirconium dioxide with a veneer ceramic comprising the following components
a)
SiO 2
58.0-72.0 percent by weight
b)
Al 2 O 3
4.0-18.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-11.0 percent by weight
e)
ZrO 2
0.5-5.5 percent by weight
f)
TiO 2
0.2-8.0 percent by weight,
and comprising lithium disilicate as a main crystal phase, characterized by the following method steps:
a) a glass fused at 1530° C. and comprising the following components
SiO 2
58.0-72.0 percent by weight
Al 2 O 3
4.0-18.0 percent by weight
Li 2 O
5.0-17.0 percent by weight
Na 2 O
4.0-11.0 percent by weight
ZrO 2
0.5-5.50 percent by weight
TiO 2
0.2-8.0 percent by weight,
is fritted in water;
b) the fritted glass is tempered for nucleation at a temperature of 500° C. to 680° C. for 2 to 6 hours;
c) after cooling, the tempered glass is mechanically pulverized;
d) the pretreated powder is converted to paste with the addition of water;
e) the paste is applied to the restorations comprising yttrium-stabilized zirconium dioxide and
f) is then subjected to a heat treatment at 800° C. to 940° C., wherein lithium disilicate is crystallized out as main crystal phase to form the veneer ceramic.
5. Method according to claim 4 , characterized in that lithium aluminum silicate and lithium titanium oxide silicate Li 2 TiOSiO 4 are also crystallized out in addition to the lithium disilicate.
6. Method according to claim 4 , characterized in that a crystalline addition comprising pulverized lithium disilicate which was produced by a solid state reaction is added to the fritted glass.
7. Process for veneering dental restorations comprising yttrium-stabilized zirconium dioxide comprising:
providing a veneer ceramic comprising the following components
a)
SiO 2
58.0-74.0 percent by weight
b)
Al 2 O 3
4.0-19.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-12.0 percent by weight
e)
ZrO 2
0.5-6.0 percent by weight,
and comprising lithium disilicate as a main crystal phase;
applying the veneer ceramic onto the yttrium-stabilized zirconium dioxide; and
subjecting the veneer ceramic to a heat treatment.
8. Process for veneering dental restorations comprising yttrium-stabilized zirconium dioxide comprising;
providing a veneer ceramic comprising the following components
a)
SiO 2
58.0-72.0 percent by weight
b)
Al 2 O 3
4.0-18.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-11.0 percent by weight
e)
ZrO 2
0.5-5.5 percent by weight
f)
TiO 2
0.2-8.0 percent by weight,
and comprising lithium disilicate as a main crystal phase;
applying the veneer ceramic onto the yttrium-stabilized zirconium dioxide; and
subjecting the veneer ceramic to a heat treatment.
9. Process for preparing a veneer ceramic comprising the following components
a)
SiO 2
58.0-74.0 percent by weight
b)
Al 2 O 3
4.0-19.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-12.0 percent by weight
e)
ZrO 2
0.5-6.0 percent by weight,
and comprising lithium disilicate as a main crystal phase, wherein nucleation is carried out in the temperature range of 500 to 680° C. and the melting and crystallization is carried out in the temperature range of 800 to 940° C.
10. Process for preparing a veneer ceramic comprising the following components
a)
SiO 2
58.0-72.0 percent by weight
b)
Al 2 O 3
4.0-18.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-11.0 percent by weight
e)
ZrO2
0.5-5.5 percent by weight
f)
TiO2
0.2-8.0 percent by weight,
and comprising lithium disilicate as a main crystal phase wherein nucleation is carried out in the temperature range of 500 to 680° C. and the melting and crystallization is carried out in the temperature range of 800 to 940° C.
11. Veneer ceramic comprising the following components
a)
SiO 2
58.0-74.0 percent by weight
b)
Al 2 O 3
4.0-19.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-12.0 percent by weight
e)
ZrO 2
0.5-6.0 percent by weight,
and comprising lithium disilicate as a main crystal phase, characterized in that the veneer ceramic further comprises titanium oxide silicate, Li 2 TiOSiO 4 , and lithium alumosilicate
12. Veneer ceramic comprising the following components
a)
SiO 2
58.0-72.0 percent by weight
b)
Al 2 O 3
4.0-18.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-11.0 percent by weight
e)
ZrO2
0.5-5.5 percent by weight
f)
TiO 2
0.2-8.0 percent by weight,
and comprising lithium disilicate as a main crystal phase, characterized in that the veneer ceramic further comprises titanium oxide silicate, Li 2 TiOSiO 4 , and lithium alumosilicate.
13. Starting glass for veneer ceramics for dental restorations comprising yttrium-stabilized zirconium dioxide, characterized in that the starting glass comprises
71.1% by weight
SiO 2 ,
4.9% by weight
Al 2 O 3 ,
14.9% by weight
Li 2 O,
3.0% by weight
Na 2 O,
5.0% by weight
TiO 2 and
1.1% by weight
ZrO 2 .
14. Starting glass for veneer ceramics for dental restorations comprising yttrium-stabilized zirconium dioxide, characterized in that the starting glass comprises
69.7% by weight
SiO 2 ,
4.8% by weight
Al 2 O 3 ,
14.6% by weight
Li 2 O,
2.9% by weight
Na 2 O,
4.9% by weight
TiO 2 ,
1.1% by weight
ZrO 2 ,
0.6% by weight
CaO, and
1.4% by weight
P 2 O 5 .
15. Starting glass for veneer ceramics for dental restorations comprising yttrium-stabilized zirconium dioxide, characterized in that the starting glass comprises
70.5% by weight
SiO 2 ,
4.9% by weight
Al 2 O 3 ,
14.8% by weight
Li 2 O,
3.0% by weight
Na 2 O,
5.0% by weight
TiO 2 ,
1.1% by weight
ZrO 2 and
0.7% by weight
CaF 2 .
16. Process for veneering dental restorations comprising yttrium-stabilized zirconium dioxide comprising;
making a veneer ceramic with a starting glass comprising the following components:
a)
SiO 2
58.0-74.0 percent by weight
b)
Al 2 O 3
4.0-19.0 percent by weight
c)
Li 2 O
5.0-17.0 percent by weight
d)
Na 2 O
4.0-12.0 percent by weight
e)
ZrO 2
0.5-6.0 percent by weight;
and wherein the starting glass is capable upon heat treatment to form a veneer ceramic comprising lithium disilicate as main drystal phase;
applying the veneer ceramic onto the yttrium-stabilized zirconium dioxide; and
subjecting the veneer ceramic to a heat treatment.
17. Process for veneering dental restorations comprising yttrium-stabilized zirconium dioxide comprising;
making a veneer ceramic with a starting glass comprising the following components;
71.1% by weight
SiO 2 ,
4.9% by weight
Al 2 O 3 ,
14.9% by weight
Li 2 O,
3.0% by weight
Na 2 O,
5.0% by weight
TiO 2 and
1.1% by weight
ZrO 2 ;
applying the veneer ceramic onto the yttrium-stabilized zirconium dioxide; and
subjecting the veneer ceramic to a heat treatment.
18. Process for veneering dental restorations comprising yttrium-stabilized zirconium dioxide comprising;
making a veneer ceramic with a starting glass comprising the following components;
69.7% by weight
SiO 2 ,
4.8% by weight
Al 2 O 3 ,
14.6% by weight
Li 2 O,
2.9% by weight
Na 2 O,
4.9% by weight
TiO 2 ,
1.1% by weight
ZrO 2 ,
0.6% by weight
CaO, and
1.4% by weight
P 2 O 5 ;
applying the veneer ceramic onto the yttrium-stabilized zirconium dioxide; and
subjecting the veneer ceramic to a heat treatment.
19. Process for veneering dental restorations comprising yttrium-stabilized zirconium dioxide comprising;
making a veneer ceramic with a starting glass comprising the following components;
70.5% by weight
SiO 2 ,
4.9% by weight
Al 2 O 3 ,
14.8% by weight
Li 2 O,
3.0% by weight
Na 2 O,
5.0% by weight
TiO 2 ,
1.1% by weight
ZrO 2 and
0.7% by weight
CaF 2 ;
applying the veneer ceramic onto the yttrium-stabilized zirconium dioxide; and
subjecting the veneer ceramic to a heat treatment.