Patent Grant
8592330
This present application is the U.S. National Stage filing under 35 U.S.C. §371 of International Application No. PCT/DE2008/000405 filed Mar. 6, 2008 and published on Sep. 12, 2008 as Publication No. WO 2008/106958 A2, which claims priority to DE Application No. 102007011337.6, filed Mar. 6, 2007, all of which are hereby incorporated by reference.
1. Field of the Invention
The invention is directed to veneer ceramics for dental restorations in which the framework ceramic is made of yttrium-stabilized zirconium dioxide.
2. Description of the Related Art
Yttrium-stabilized zirconium dioxide is a high-performance material of extremely high strength that is used to an increasing extent in restorative dentistry for framework ceramics for crowns, inlays, and bridges. The application of veneer ceramics is required for fine adjustment to the diversity of natural teeth. Up to the present, veneer ceramics have presented a weak point in the ability of the restored teeth to withstand stress.
Veneer ceramics should permit excellent shaping, be conformable to the adjacent teeth with respect to coloring, be highly resistant to chemicals, have a high flexural strength even after a directed heat treatment, and be characterized by outstanding adhesion to the framework ceramic.
Powders or pastes are generally used as starting materials for producing the veneer ceramics. The properties of the veneer ceramic are determined by the chemical and crystallographic features as well as by the grain size of the starting materials.
According to U.S. Pat. No. 4,798,536 A, leucite-containing dental porcelains are produced by means of the fused glass. The leucite content is in the range of 35 to 60 percent by weight. The high coefficient of expansion of the leucite-containing dental porcelain of 13 to 15×10−6/K is used for veneering metal crowns. The flexural strength of the veneer ceramic with leucite crystals is 80 MPa.
The use of lithium disilicate is proposed for a restorative tooth prosthesis in U.S. Pat. No. 4,189,325 A. This reference concentrates on the material system of Li2O—CaO—Al2O3—SiO2. The nucleating agents Nb2O5 and Pt are added to promote crystallization.
U.S. Pat. No. 4,515,634 A suggests the addition of the nucleating agent P2O5 to the basic system of Li2O—CaO—Al2O3—SiO2 in order to improve nucleation and crystallization.
Laid Open Application DE 197 50 794 A1 describes the use of lithium disilicate glass ceramics use in the hot pressing method. However, it has been shown that application of this method results in insufficient edge strength of the restored tooth and increased tool wear during finishing.
DE 103 36 913 A1 suggests a two-stage fabrication of the tooth to be restored. In the first step, lithium metasilicate is crystallized and is mechanically worked to form dental products. The lithium metasilicate is converted to the stronger lithium disilicate by a second heat treatment. Accordingly, the restored tooth is made entirely of glass ceramic with lithium disilicate crystals.
German Patent DE 196 47 739 C2 describes a sinterable lithium disilicate glass ceramic and glass. The starting material is sintered to form blanks These blanks are pressed at 700° C. to 1200° C. to form dental products. The described lithium disilicate glass ceramic shows only a slight reaction to the adjacent casting investment during plastic deformation.
EP 1 235 532 A1 describes a method for producing a high-strength ceramic dental prosthesis based on yttrium-stabilized zirconium dioxide. The framework ceramics produced by this method have 4-point flexural strengths greater than 1200 MPa.
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.
The invention will be described more fully in the following with reference to embodiment examples. The drawings show:
According to the invention, the objects are met in a veneer ceramic for dental restorations made of yttrium-stabilized zirconium dioxide which is produced by the following components:
It can be advantageous when another nucleating agent, e.g., TiO2, is added within limits of 0.2 to 8.0 percent by weight in addition to the nucleating agent ZrO2.
The veneer ceramic is applied as powdered starting glass with crystalline additions or without separate crystalline additions and is sintered onto dental products of yttrium-stabilized zirconium dioxide by means of a defined temperature program in the range of 800° C. to 940° C. and crystallized in a controlled manner.
Surprisingly, it was shown that a very high adhesion strength to dental products of yttrium-stabilized zirconium dioxide is achieved with specific glass ceramics and a defined temperature program. The veneer ceramic is translucent and has very good resistance to chemicals. The main crystal phase of the glass ceramic comprises lithium disilicate.
Besides the powdered starting glasses of the glass ceramic, the veneer ceramic can also contain powdered crystals as starting product. By means of a defined heat treatment, the powdered veneer ceramic undergoes the processes of nucleation, sintering and fusion with the yttrium-stabilized zirconium dioxide and crystallization accompanied by the formation of microcrystals.
Also, powdered lithium disilicate is preferably added to the starting glasses. The lithium disilicate can be produced by a solid state reaction.
The addition of TiO2 promotes the process of nucleation and crystallization of lithium disilicate. The veneer ceramic is then advantageously formed from a mixture containing the following components:
Zirconium dioxide or a mixture of zirconium dioxide and titanium dioxide is used as nucleating agent for the controlled crystallization of the veneer ceramic based on lithium silicate materials. The addition of titanium dioxide promotes the conversion of lithium metasilicate to lithium disilicate.
In a preferable veneer ceramic, lithium titanium oxide silicate Li2TiOSiO4, lithium aluminum silicate (beta spodumene) and small amounts of lithium metasilicate are crystallized in addition to the lithium disilicate.
The veneer ceramic can also be formed in such a way that the crystalline portion is below 40%. In this case, the veneer ceramic is thinly applied, serves for color matching, and imparts a particular aesthetic gloss to the dental framework ceramic. The strength of the veneer ceramic can be further increased by deliberate compressive stresses.
The oxides of elements Ce, Fe, Mn, Sn, V, Cr, In, and of rare earths Pr, Nd, Sm, Eu, Tb, Dy and Er can be used as coloring or fluorescing additions.
To modify the technology, the additives La2O3, B2O3, P2O5, CaO, MgO, ZnO and fluoride can be added independently from one another in concentrations of up to 4.0 percent by weight at most.
In addition to the Li2O3, other alkali oxides may be included for the suppression of crystallization of beta-quartz mixed crystals.
To produce the veneer ceramic, nucleation is carried out in the temperature range of 500° C. to 680° C., and the melting and crystallization is carried out in the temperature range of 800° C. to 940° C. The nucleation and crystallization processes can be interrupted in that the veneer ceramic is cooled to room temperature between nucleation and crystallization, stored, and then heated to the crystallization temperature.
The adhesion strength between the yttrium-stabilized zirconium dioxide and the veneer ceramic is determined by flexural testing. For this purpose, the powdered veneer ceramic is applied to the end face of two round rods of zirconium dioxide and subjected to the defined heat treatment. The adhesion strength is determined by the three point flexural test.
Veneer ceramics with an adherence to zirconium dioxide of at least 150 MPa are preferred.
Twelve compositions are shown in Table 1 as embodiment examples of the veneer ceramics according to the invention.
The starting glasses were fused in platinum or platinum-rhodium crucibles at a temperature of 1530° C. and cast in water to produce a frit (
To promote the controlled crystallization, the fitted starting glasses are tempered for approximately 4 hours at 580° C.±100° C. and powdered after cooling. The grain size used ranges from 0.6 μm to 20 μm.
Powdered lithium disilicate can be added to the starting glasses. The lithium disilicate is produced by a solid state reaction.
The moistened starting materials are applied to the dental framework ceramic of yttrium-stabilized zirconium dioxide as veneer ceramic, melted at 890° C.±50° C. and crystallized in a controlled manner.
All twelve examples of the veneer ceramics listed in Table 1 are translucent.
The optical effect and the mechanical resistance of the veneer ceramics are influenced by the structure of the veneer ceramic as well as by the interaction of the veneer ceramic and framework ceramic.
The coefficient of expansion (α) of the veneer ceramic and of the framework ceramic of yttrium-stabilized zirconium dioxide (TZ3Y) must be adapted to one another.
Based on the examples in Table 1, the coefficients of expansion (α) of the veneer ceramics are shown and compared with yttrium-stabilized zirconium dioxide in Table 2.
The adhesion strength between the framework ceramic of yttrium-stabilized zirconium dioxide and the veneer ceramic was determined by the three point flexural test. For this purpose, the powder of the veneer ceramic was applied between two cylindrical samples of zirconium dioxide and subjected to a heat treatment corresponding to
Table 3 shows the adhesion strength for selected samples, where α=adhesion strength in MPa based on the three point flexural test and m=Weibull parameter.
Depending on the composition and heat treatment, the course of nucleation and crystallization may differ in the veneer ceramics with high adhesion strength according to the invention.
Referring to Table 1 and a temperature of 890° C.±50° C., the examples of veneer ceramics 1, 4, 8, 9 and 10 crystallize to lithium silicate and zirconium dioxide crystal phases. The zirconium dioxide serves as a nucleating agent. The crystallization of the lithium silicate takes place in two temporal stages. First, lithium metasilicate Li2SiO3 is formed and, through the subsequent reaction with the surrounding silicate phase, lithium metasilicate is converted to lithium disilicate Li2Si2O5.
Referring to Table 1 and a temperature of 890° C.±50° C., the examples of veneer ceramics 2, 5 and 7 crystallize to crystal phases of lithium disilicate, beta spodumene, lithium titanium oxide silicate Li2(TiO)(SiO4), and lithium metasilicate. The crystallization of lithium disilicate Li2Si2O5 is accelerated by the addition of titanium dioxide.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2007 011 337 | Mar 2007 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/DE2008/000405 | 3/6/2008 | WO | 00 | 10/20/2010 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2008/106958 | 9/12/2008 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 2684911 | Stookey | Jul 1954 | A |
| 3022180 | Morrissey et al. | Feb 1962 | A |
| 3252778 | Goodmann et al. | May 1966 | A |
| 3287201 | Chisholm et al. | Nov 1966 | A |
| 3006775 | Chen | Oct 1969 | A |
| 3679464 | Eppler | Jul 1972 | A |
| 3804608 | Gaskell et al. | Apr 1974 | A |
| 3816704 | Borom et al. | Jun 1974 | A |
| 3977857 | Mattox | Aug 1976 | A |
| 4189325 | Barrett et al. | Feb 1980 | A |
| 4414282 | McCollister et al. | Nov 1983 | A |
| 4473653 | Rudoi | Sep 1984 | A |
| 4480044 | McAlinn | Oct 1984 | A |
| 4515634 | Wu et al. | May 1985 | A |
| 4755488 | Nagashima | Jul 1988 | A |
| 4798536 | Katz | Jan 1989 | A |
| 5176961 | Crooker et al. | Jan 1993 | A |
| 5217375 | Oden et al. | Jun 1993 | A |
| 5219799 | Beall et al. | Jun 1993 | A |
| 5507981 | Petticrew | Apr 1996 | A |
| 5618763 | Frank et al. | Apr 1997 | A |
| 5641347 | Grabowski et al. | Jun 1997 | A |
| 5698482 | Frank et al. | Dec 1997 | A |
| 5872069 | Abe | Feb 1999 | A |
| 5874376 | Taguchi et al. | Feb 1999 | A |
| 5968856 | Schweiger et al. | Oct 1999 | A |
| 6022819 | Panzera et al. | Feb 2000 | A |
| 6048589 | Suzuki | Apr 2000 | A |
| 6106747 | Wohlwend | Aug 2000 | A |
| 6119483 | Takahashi et al. | Sep 2000 | A |
| 6174827 | Goto | Jan 2001 | B1 |
| 6270876 | Abe et al. | Aug 2001 | B1 |
| 6280863 | Frank et al. | Aug 2001 | B1 |
| 6376397 | Petticrew | Apr 2002 | B1 |
| 6420288 | Schweiger et al. | Jul 2002 | B2 |
| 6514893 | Schweiger et al. | Feb 2003 | B1 |
| 6517623 | Brodkin et al. | Feb 2003 | B1 |
| 6593257 | Nagata | Jul 2003 | B1 |
| 6802894 | Brodkin et al. | Oct 2004 | B2 |
| 7162321 | Luthardt et al. | Jan 2007 | B2 |
| 7166548 | Apel et al. | Jan 2007 | B2 |
| 7316740 | Schweiger et al. | Jan 2008 | B2 |
| 7452836 | Apel et al. | Nov 2008 | B2 |
| 7867930 | Apel et al. | Jan 2011 | B2 |
| 7867933 | Apel et al. | Jan 2011 | B2 |
| 7993137 | Apel et al. | Aug 2011 | B2 |
| 20020009600 | Peng | Jan 2002 | A1 |
| 20020022563 | Schweiger et al. | Feb 2002 | A1 |
| 20090023574 | Holand et al. | Jan 2009 | A1 |
| 20090038344 | Apel et al. | Feb 2009 | A1 |
| 20090038508 | Apel et al. | Feb 2009 | A1 |
| 20090256274 | Castillo | Oct 2009 | A1 |
| 20110030423 | Johannes et al. | Feb 2011 | A1 |
| 20120094822 | Castillo | Apr 2012 | A1 |
| 20120148988 | Castillo | Jun 2012 | A1 |
| 20122309607 | Durschang | Jun 2012 |
| Number | Date | Country |
|---|---|---|
| 2252660 | May 1999 | CA |
| 2451121 | May 1975 | DE |
| 3015529 | Jun 1980 | DE |
| 19647739 | Mar 1998 | DE |
| 0231773 | Aug 1987 | EP |
| 774933 | Jun 2000 | EP |
| 1422210 | May 2004 | EP |
| 1505041 | Sep 2005 | EP |
| 2284655 | Jun 1995 | GB |
| 11074418 | Mar 1999 | JP |
| 2001035417 | Feb 2001 | JP |
| 2005062832 | Mar 2005 | JP |
| WO0247616 | Jun 2002 | WO |
| WO03035014 | Jan 2003 | WO |
| Entry |
|---|
| Sundh et al. Fracture resistance of yttrium oxide partially-stabilized zirconia all-ceramic bridges after veneering and mechanical fatigue testing. Dental Materials (2005) 21, 476-482. |
| Stookey, S.D., “Chemical Machining of Photosensitive Glass,” Ind. Eng. Chem. 45:115-118 (1993). |
| Von Clausburch et al., “The effect of P205 on the Crystallization and Microstructure of Glass-Ceramics in the Si02-Li20-K2O-ZnO-P205 System,” J. of Non-Crystalline Solids 263&264, pp. 388-394 (2000). |
| Giassi et al., “Injection Moulding of LiO2-ZrO2-SiO2-Al2O3 (LZSA) Glass Ceramics,” Glass Technol., 46(3), 277-280. (2005). |
| Borom, et al , Strength and Microstructure in Lithium Disilicate Glass Ceramics, J. Am Ceram Soc 58 (9-10): 285-391 (1975). |
| Oliveira et al., “Sintering and Crystallization of a GlassPowder in the Li20-Zr02-Si02 System,” J. Am. Ceramic Soc. 81(3):777-780 (1998). |
| Von Clausburch et al., “Effect of ZnO on the Crystallization, Microstructure, and Properties of Glass-Ceramics in the Si02-Li2O-K20-P205 System,” Glastech. Ber. Glass Sci. Technol. 74(8):223-229 (2001). |
| Number | Date | Country | |
|---|---|---|---|
| 20110030423 A1 | Feb 2011 | US |
