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KR-20260065611-A - Dental glass ceramic molded body

KR20260065611AKR 20260065611 AKR20260065611 AKR 20260065611AKR-20260065611-A

Abstract

The present invention relates to a glass ceramic molded body comprising a zirconium dioxide crystal into which one or more co-metal oxides are introduced.

Inventors

  • 노인, 크리스토퍼

Assignees

  • 비타 찬파브릭 하. 라우터 게엠베하& 코.카게

Dates

Publication Date
20260508
Application Date
20240905
Priority Date
20230905

Claims (20)

  1. A glass ceramic molded body having a color gradient comprising crystals of zirconium dioxide into which one or more co-metal oxides are introduced.
  2. The glass ceramic molded body of claim 1, wherein the crystal is a mixed crystal of zirconium dioxide and co-metal oxide.
  3. The glass ceramic molded body of claim 1, wherein the crystal is a zirconium dioxide crystal doped with a co-metal oxide.
  4. In any one of the prior claims, the co-metal oxide is a glass ceramic molded body selected from the group consisting of oxides of elements d and f of the periodic table.
  5. In any one of the prior claims, the co-metal oxide is a glass ceramic molded body selected from the group consisting of cerium oxide, terbium oxide, praseodymium oxide, erbium oxide, neodymium oxide, europium oxide, iron oxide, vanadium oxide, manganese oxide, and mixtures thereof.
  6. A glass ceramic molded body according to any one of the prior claims, wherein the size of the zirconium dioxide crystal into which one or more co-metal oxides are introduced is 1000 nm or less, preferably 500 nm or less.
  7. In any one of the prior claims, the molded body is a glass ceramic molded body that is a monolithic molded body for dental restoration.
  8. A glass ceramic molded body according to any one of the prior claims, wherein the molded body has an amorphous portion and a crystalline portion, and the amorphous portion and the crystalline portion have an inhomogeneous distribution.
  9. A glass ceramic molded body according to any one of the prior claims, wherein the weight ratio of the amorphous portion to the crystalline portion of the molded body gradually changes, and the gradient is formed along an axis passing through the molded body.
  10. In any one of the prior claims, the molded body is a glass ceramic molded body in which the weight ratio of zirconium dioxide crystals into which one or more co-metal oxides are introduced gradually changes, and the gradient is formed along an axis passing through the molded body.
  11. In any one of the prior claims, the molded body is a glass ceramic molded body further comprising lithium metasilicate and/or lithium disilicate crystals.
  12. In any one of the prior claims, the molded body is a glass ceramic molded body comprising lithium disilicate as the main crystalline phase.
  13. In any one of the prior claims, the molded body is preferably a glass ceramic molded body comprising SiO2 in an amount of 50 to 70 weight%.
  14. In any one of the prior claims, the molded body is preferably a glass ceramic molded body comprising Li₂O in an amount of 10 to 25 weight percent.
  15. In any one of the prior claims, the molded body is preferably a glass ceramic molded body comprising K₂O in an amount of 0.5 to 6 weight%.
  16. In any one of the prior claims, the molded body is preferably a glass ceramic molded body comprising P₂O₅ in an amount of 2 to 12 weight percent.
  17. In any one of the prior claims, the molded body is preferably a glass ceramic molded body comprising P₂O₅ in an amount of 2 to 12 weight percent.
  18. In any one of the prior claims, the molded body is preferably a glass ceramic molded body comprising ZrO2 in an amount of 8 to 15 weight%.
  19. In any one of the prior claims, the molded body is preferably a glass ceramic molded body comprising a co-metal oxide in an amount of 0.1 to 10 weight percent.
  20. In any one of the prior claims, the molded body is a glass ceramic molded body comprising the following components: i) 56 to 64 weight%, preferably 56 to 59 weight% of SiO2 , ii) 15 to 21 weight%, preferably 16 to 20 weight% of Li₂O , iii) 1 to 4 weight% of K₂O , iv) 3 to 8 weight% of P₂O₅ , v) 8 to 15 weight%, preferably 8 to 12 weight%, particularly 9 to 11 weight% of ZrO2 , and vi) 0.1 to 8 weight percent of co-metal oxide.

Description

Dental glass ceramic molded body The present invention relates to a glass ceramic molded body advantageously suitable for dental use, a method for manufacturing the same, and the use thereof for manufacturing dental restorations. Modern dental prosthetic materials must meet high requirements for stability and aesthetics. The balance between effort and quality is a critical factor, as all dental restorations are fabricated individually to fit each patient. During the manufacturing process, reproducing the aesthetic appearance of the tooth is particularly important, as this is directly related to patient comfort. Therefore, restorations must possess a certain level of translucency or opacity depending on their intended use. Furthermore, the materials used must be able to withstand the mechanical and chemical stresses generated during daily food intake. Due to these requirements, glass ceramics have been established as a common material for the manufacture of dental restorations, and their strength and aesthetic properties are particularly highly valued. The crystalline portion not only prevents crack propagation but also reflects and refracts light in a manner different from classical glass. As a result, a translucency very close to that of natural teeth is achieved, which is why dental glass ceramics are used particularly in the aesthetic areas of the anterior tooth region. The Journal of the European Ceramic Society, Vol. 41, No. 11, pages 5728-5739 describes glass ceramic materials having a zirconium silicate glass matrix in addition to lithium disilicate, lithium metasilicate, and lithium phosphate. However, there is no mention of the use of zirconium oxide cocrystallites and their application to gradient dental restorations. The Journal of the Mechanical Behavior of Biomedical Materials, Elsevier, Amsterdam, Vol. 105, pp. 1-8 describes plasma sintering and pressureless sintering processes for lithium silicate glass ceramics containing ZrO2 . This process enables low-temperature sintering and the formation of lithium disilicate nanocrystals. However, there is no mention of the use of zirconium oxide co-crystals or their application to gradient dental restorations. Glass ceramics containing ZrO2 are disclosed in Propriedades de dissilicato de lito Reforcado com ZrO2 , Congresso Brasiliero de Engenharia e Ciencia dos Materiais. However, zirconium oxide co-crystals forming a color gradient in ceramic blocks or dental restorations are not described. EP 3772492 A1 describes glass ceramics that are made more opaque through multiple heat treatments. However, the formation of zirconium oxide co-crystals is not disclosed. WO 2017/067909 A1 describes a glass ceramic whose optical properties are controlled through multiple stages of heating. However, the formation of a zirconium oxide co-crystal is not disclosed. EP 2765119 discloses a dental blank comprising at least two layers joined together, wherein the layers are made of lithium silicate glass, lithium silicate glass containing a core, or lithium metasilicate glass ceramic, have different colors from each other, and the layers form a monolithic structure. Accordingly, it is stated that the optical properties of natural tooth materials can be well mimicked and molded without shrinkage. WO 2013/086187 relates to a lithium silicate glass ceramic comprising 6 to 30 wt% Cs₂O , 55 to 80 wt% SiO₂ , 1 to 5 wt% Al₂O₃ and B₂O₃ , 7 to 16 wt% Li₂O , and 1 to 5 wt% P₂O₅ , wherein each wt% is based on the total weight of the glass ceramic. In particular, it is stated that a block having high transparency can be obtained. EP 2114348 discloses a ceramic material composed of yttrium-stabilized zirconium dioxide comprising 58.0-74.0 wt% SiO₂ , 4.0-19.0 wt% Al₂O₃ , 5.0-17.0 wt% Li₂O , 4.0-12.0 wt% Na₂O , and 0.5-6.0 wt% ZrO₂ , which is described as providing high flexural strength and translucency at the same time. Figure 1 shows the crystal structure and size of ZrO2 crystal clusters in the cervical portion of a glass ceramic molded body according to the present invention, recorded using SEM. FIG. 2 shows a ZrO2 cluster according to the present invention having nanocrystalline ZrO2 crystals. FIG. 3 shows the change in crystal structure from the cervical portion (1) to the incisal edge (12) of a glass ceramic molded body according to the present invention, recorded using SEM and XRD. FIG. 4 shows exemplary color measurement results characterized by color coordinates (reflective measurements) and ΔE of different regions (from the incisal edge of plate (1) to the cervical portion of plate (5)) of a glass ceramic molded body according to the present invention. FIG. 5 shows the crystal composition of the crystal phase from the tooth cutting edge (1) to the cervical portion (7) of the glass ceramic molded body according to the present invention, determined by Rietveld analysis, and the color measurement by transmission in the wavelength range of 360 to 750 nm. FIG. 6 shows the crystal