Dental fully sintered zirconia block and dental product comprising the same

Abstract

The present disclosure relates to a dental full-sintered zirconia block and a dental product including the same, and according to an embodiment of the present disclosure, there is provided a dental full-sintered zirconia block including a main body as a processing object, a concave portion connected to a lower surface of the main body, and a support portion connected to the concave portion, wherein the concave portion maintains a predetermined lateral length from the main body to the support portion, and the lateral length of the concave portion is 2 mm or more and less than 4 mm.

Description

Technical Field

[0001] This disclosure relates to a fully sintered zirconia block for dental use and dental products comprising the zirconia block. Background Technology

[0002] Zirconia, as a dental ceramic material, is in no way inferior to metal restorations and other ceramic materials in terms of strength and aesthetics. Due to its chemical resistance, abrasion resistance, and high melting point, zirconia is attracting attention not only in dentistry but also in various industrial sectors. Furthermore, because it is unaffected by concerns about cytotoxicity, carcinogens, and heavy metals, it is highly favored as a ceramic material for bio-structural applications.

[0003] Zirconia possesses excellent mechanical properties; conversely, its final sintered form is difficult to process due to its high hardness. Because of these issues, before completing the final sintered body, a semi-sintered porous zirconia body is initially sintered at low temperatures to create a porous zirconia body. This is then processed and finally sintered a second time to complete the restoration. Considering that porous zirconia shrinks during the final sintering process, it must be formed at a volume greater than 20%. However, for semi-sintered zirconia, the following problem arises: it is difficult to reduce the volume according to the patient's actual tooth size during the final sintering process.

[0004] As mentioned above, due to issues with durability, processing time, and machinability, the fabrication of restorations inevitably requires a significant amount of time and expense. Furthermore, the difficulty in shaping the final restoration to best suit the patient's oral cavity structure limits the competitiveness of zirconia restorations.

[0005] In addition, recently, in order to shorten the time for making restorations, a technical solution has been proposed to shape restorations by directly processing fully sintered zirconia bodies instead of processing pre-sintered zirconia bodies.

[0006] However, conventional zirconia sintered bodies, being simple cuboids, have the disadvantages of requiring a large amount of cutting for machining and shaping repair bodies, and potentially causing tool damage during processing. Summary of the Invention

[0007] This disclosure provides a fully sintered zirconia block for dental use with significantly reduced cutting amount and a dental product comprising the zirconia block in order to solve the above-mentioned problems.

[0008] A dental fully sintered zirconia block according to an embodiment of the present disclosure includes: a main body as the object to be processed; a concave portion connected to the underside of the main body; and a support portion connected to the concave portion, wherein the concave portion maintains a predetermined lateral length from the main body to the support portion, and the lateral length of the concave portion is 2 mm or more and less than 4 mm.

[0009] According to one embodiment of this disclosure, the portion where the concave portion connects to the main body and the portion where the concave portion connects to the support portion may respectively include a rounded curved portion.

[0010] According to one embodiment of this disclosure, the cross-section parallel to the length direction of the body may include rounded corners, wherein the radius of curvature of the rounded corners may be from 0.5 mm to 10 mm.

[0011] According to one embodiment of this disclosure, the lateral length of the main body can be from 10 mm to 16 mm.

[0012] According to one embodiment of this disclosure, the radius of curvature of the rounded bend can be from 0.5 mm to 2 mm.

[0013] According to one embodiment of this disclosure, the vertical length of the concave portion can be from 1 mm to 10 mm.

[0014] According to one embodiment of this disclosure, the vertical length of the support portion can be from 2 mm to 8 mm.

[0015] According to one embodiment of this disclosure, the cross-section perpendicular to the length direction of the body can have a quadrilateral shape including rounded corners.

[0016] According to one embodiment of the present disclosure, a dental product comprising the above-described fully sintered zirconia block for dental use is provided.

[0017] According to one embodiment of this disclosure, the processing time required to manufacture dental products can be reduced by providing a fully sintered zirconia block with a minimized processing area.

[0018] According to one embodiment of this disclosure, a fully sintered zirconia block can be provided that has excellent resistance to cracking and excellent machinability.

[0019] The technical effects of this disclosure are not limited to those mentioned above. Those skilled in the art to which this disclosure pertains (referred to as "a person skilled in the art") can clearly understand other technical effects not mentioned through the description in the claims. Attached Figure Description

[0020] The accompanying drawings of this invention are used to illustrate preferred embodiments of the invention and, together with the detailed description of the invention described below, serve to provide a deeper understanding of the technical concept of the invention. Therefore, the invention should not be interpreted in isolation from the matters described in these drawings.

[0021] Figure 1 This is a perspective view of a fully sintered zirconia block for dental use according to an embodiment of the present disclosure.

[0022] Figure 2 This is a front view of a fully sintered zirconia block for dentistry according to an embodiment of the present disclosure.

[0023] Figure 3 This is a front view of a fully sintered zirconia block for dentistry according to an embodiment of the present disclosure.

[0024] Figure 4 This is a front view of a fully sintered zirconia block for dentistry according to an embodiment of the present disclosure.

[0025] Figure 5 This is a front view of a fully sintered zirconia block for dentistry according to an embodiment of the present disclosure.

[0026] Figure 6 This is a front view of a fully sintered zirconia block for dentistry according to an embodiment of the present disclosure.

[0027] Figure 7 This is a front view of a fully sintered zirconia block for dentistry according to an embodiment of the present disclosure.

[0028] Figure 8 This is a front view showing a dental fully sintered zirconia block bonded to a mandrel according to an embodiment of the present disclosure.

[0029] [Explanation of Labels in the Attached Image] 100: Dental fully sintered zirconia blocks 110: Main Body 120: Concave part 130: Support section 200: Core rod Detailed Implementation

[0030] The following will describe in detail implementation examples of the present invention. However, this is given by way of example only, and the invention is not limited thereto, and is defined only by the scope of the claims.

[0031] Unless otherwise specified in this specification, when describing a layer, film, region, plate, etc. as being "on" other parts, it includes not only the case where it is located immediately above the other parts, but also the case where there is another part in between.

[0032] Unless otherwise specified in this specification, the singular form also includes the plural form. Also, unless otherwise specified, "A or B" can mean "including A or including B or including both A and B".

[0033] In this specification, "these combinations" may refer to mixtures, laminates, complexes, copolymers, alloys, blends, and reaction products of the components.

[0034] Although similar or equivalent methods and materials may be used in the implementation or testing of the invention as described herein, suitable methods and materials are described herein. Unless otherwise specified in the text, the singular includes the plural.

[0035] In this specification, terms such as "comprising" or "having" should be understood as indicating the presence of features, figures, steps, operations, constituent elements, components, ingredients, materials, or combinations thereof described in the specification, rather than precluding the possibility of the presence or addition of one or more other features, figures, steps, operations, constituent elements, components, ingredients, materials, or combinations thereof.

[0036] In this specification, the term "these combinations" may refer to a mixture or combination with one or more of the described constituent elements, and may refer to mixtures, laminates, complexes, copolymers, alloys, blends, and reaction products of the composition.

[0037] In this specification, the term "and / or" can refer to any combination and all combinations of more than one item described in connection with the description. In this specification, the term "or" means "and / or".

[0038] In this specification, although terms such as "first," "second," etc., are used to describe multiple constituent elements, these constituent elements should not be limited by these terms. These terms are used only to distinguish one constituent element from another.

[0039] The following description, with reference to the accompanying drawings, provides a more detailed account of exemplary embodiments.

[0040] Figure 1 This is a perspective view of a fully sintered zirconia block 100 for dental use according to an embodiment of the present disclosure.

[0041] Reference Figure 1 The dental sintered zirconia block 100 may include: a body 110 as the object to be processed; a stem 120 connected to the underside of the body 110; and a support 130 connected to the stem 120.

[0042] The main body 110 is the part that is machined during the manufacture of dental products. For example, in the fabrication of a crown for a dental model used in implant surgery, the main body 110 is directly machined into the dental model. Typically, the machining of the main body 110 can be performed using computer-aided design and manufacturing (CAD / CAM). More specifically, the dental model can be scanned first, then a restoration model can be created from the scanned data, and then input into a machining machine to machine the zirconia block according to the restoration. The machining machine can be a milling machine.

[0043] The cross-section parallel to the length direction of the main body 110 can have a cuboid shape with rounded corners. The radius of curvature of the rounded corners of the main body 110 can be 0.5 mm to 10 mm, 1 mm to 10 mm, 1 mm to 9 mm, 1 mm to 8 mm, 1 mm to 7 mm, 1 mm to 6 mm, 2 mm to 6 mm, 3 mm to 6 mm, or 4 mm to 6 mm. As a preferred embodiment, the radius of curvature of the rounded corners can be more than 1 mm and less than 6 mm. When the cross-section parallel to the length direction of the main body 110 includes rounded corners with radii of curvature within the above-mentioned range, the machining time for manufacturing dental products utilizing the dental zirconia block 100 is reduced due to the reduced cutting amount, and ease of machining is improved. Furthermore, the consumption of drill bits (burs) used when machining the dental zirconia block 100 can be minimized.

[0044] Figures 2 to 7 This is a front view showing a dental fully sintered zirconia block 100 according to various embodiments of the present disclosure.

[0045] To be more detailed, Figures 2 to 7 The cases shown illustrate different radii of curvature of the rounded corners of the cross-section that form a cross-section parallel to the length direction of the main body 110 of the dental sintered zirconia block 100. Figure 2 The diagram shows a case where the radius of curvature (R1) of the rounded corners of the cross-section forming the main body 110 of the dental sintered zirconia block 100 is 1 mm, which is parallel to the longitudinal direction of the cross-section. Figure 3 The case where the radius of curvature is 2 mm (R2) is shown. Figure 4 The case where the radius of curvature is 3 mm (R3) is shown. Figure 5 The case where the radius of curvature is 4 mm (R4) is shown. Figure 6 The case where the radius of curvature is 5 mm (R5) is shown. Figure 7 The case where the radius of curvature is 6 mm (R6) is shown.

[0046] The following measurement results are shown in Table 1: the reduction rate of cutting amount when machining dental sintered zirconia block 100 compared to the case where the radius of curvature of the rounded corner of the cross section parallel to the length direction of the main body 110 is R1 (1 mm).

[0047] Table 1 As shown in Table 1, it can be confirmed that as the radius of curvature of the rounded corner constituting the cross-section parallel to the length direction of the main body 110 increases from R2 to R6, the cutting reduction rate also increases. However, the radius of curvature of the rounded corner constituting the cross-section parallel to the length direction of the main body 110 cannot be increased indefinitely in order to reduce the cutting amount during machining. Considering the maximum size of the molars of adult males (approximately 12 mm), it is preferable to design the radius of curvature of the rounded corner constituting the cross-section parallel to the length direction of the main body 110 to be no more than 6 mm. However, this is limited to the case of the maximum size of the molars of adult males. For restorations larger than this, the radius of curvature of the rounded corner can be more than 1 mm and less than 6 mm.

[0048] The lateral length L1 of the main body 110 can be 10mm to 16mm, 11mm to 16mm, 12mm to 16mm, 12mm to 15mm or 12mm to 14mm.

[0049] Refer again Figure 1 The thickness W of the main body 110 can be 10mm to 20mm, 10mm to 18mm, 12mm to 18mm, 12mm to 16mm, or 12mm to 14mm. The lateral length L1 and thickness W of the main body 110 can be configured to correspond to the specifications of the milling machine and tools used to process the main body 110. When the lateral length L1 and thickness W of the main body 110 have the above-mentioned numerical ranges, not only can the resistance to cracking of the dental fully sintered zirconia block 100 be improved, but also the machinability can be improved.

[0050] In addition, the vertical length L6 of the main body 110 (referring to...) Figure 1 The length in the vertical direction can be 15mm or more and 22mm or less, 16mm or more and 22mm or less, 16mm or more and 21mm or less, or 16mm or more and 20mm or less. Similar to the lateral length L1 and thickness W of the main body 110 described above, the vertical length L6 of the main body 110 can be configured to correspond to the specifications of the milling machine and tool, and can be formed to correspond to the vertical length L3 of the concave portion 120 and the vertical length L5 of the support portion 130 described later.

[0051] The concave portion 120 can be connected to the lower end of the main body 110 and the upper end of the support portion 130. The concave portion 120 can serve to support the main body 110.

[0052] The concave portion 120 may be a columnar shape that is formed to be longer in the vertical direction. According to one embodiment of the present disclosure, the concave portion 120 can be connected from the lower central portion of the main body 110 to the upper central portion of the support portion 130 in a manner that maintains a predetermined lateral length.

[0053] The lateral length L2 of the concave portion 120 can be 2 mm or more and less than 4 mm, 2.2 mm or more and less than 4 mm, 2.5 mm or more and less than 4 mm, 2.8 mm or more and less than 4 mm, 3 mm or more and less than 4 mm, 3.2 mm or more and less than 4 mm, or 3.5 mm or more and less than 4 mm. When the lateral length L2 of the concave portion 120 has the above-mentioned numerical range, during the processing of dental products, damage or deformation of the dental sintered zirconia block 100 can be prevented while reducing the cutting amount of the dental sintered zirconia block 100. As a preferred embodiment, the lateral length L2 of the concave portion 120 can be 3 mm or more and less than 4 mm. Accordingly, the size of the concave portion 120, which is the portion removed from the finally manufactured dental product, is minimized, so that material consumption and tool fatigue can be minimized, while preventing damage to the concave portion 120 that may occur during processing due to an excessively short lateral length L2.

[0054] The vertical length L3 of the concave portion 120 can be 1mm to 10mm, 2mm to 10mm, 2mm to 9mm, 2mm to 8mm, or 2mm to 7mm. Because the vertical length L3 of the concave portion 120 falls within the aforementioned range, it can prevent damage while supporting the main body 110 during the machining of the dental fully sintered zirconia block 100. Furthermore, during the cutting process of the main body 110, the main body 110 and the support portion 130 can be distinguished from each other to prevent accidental machining of the support portion 130 by the cutting tool.

[0055] The thickness W of the concave portion 120 can be 10 mm to 20 mm, 10 mm to 18 mm, 12 mm to 18 mm, 12 mm to 16 mm, or 12 mm to 14 mm. When the thickness W of the concave portion 120 has the above-mentioned numerical range, it can not only improve the resistance to cracking of the dental fully sintered zirconia block 100, but also improve the machinability.

[0056] The portion where the concave portion 120 connects to the main body 110 and the portion where the concave portion 120 connects to the support portion 130 may each include a rounded curved portion R'.

[0057] The radius of curvature R' of the rounded bend can be 0.5mm to 2mm, 0.5mm to 1.8mm, 0.5mm to 1.6mm, 0.5mm to 1.4mm, 0.7mm to 1.4mm, 0.8mm to 1.4mm, or 0.8mm to 1.2mm. Since the rounded bends, including the connections between the concave portion 120 and the main body 110 and between the concave portion 120 and the support portion 130, have the aforementioned radius of curvature R', the cutting amount during machining the dental zirconia block 100 can be reduced, and damage to the dental zirconia block 100 during machining can be prevented.

[0058] The support portion 130 can be positioned at the lowest end of the dental sintered zirconia block 100 to ultimately support the main body 110 and the concave portion 120. The lateral length L4 of the support portion 130 can be greater than or equal to the lateral length L1 of the main body 110.

[0059] The lateral length L4 of the support 130 can be 10mm to 16mm, 11mm to 16mm, 12mm to 16mm, 12mm to 15mm, 12mm to 14mm or 13mm to 14mm.

[0060] The vertical length L5 of the support part 130 can be 2mm to 8mm, 2mm to 7mm, 2mm to 6mm, 3mm to 6mm, or 3mm to 5mm.

[0061] The cross-section parallel to the length direction of the support portion 130 can have a cuboid shape with rounded corners. The radius of curvature R'' of the rounded corners constituting the cross-section parallel to the length direction of the support portion 130 can be 0.5mm to 10mm, 1mm to 10mm, 1mm to 9mm, 1mm to 8mm, 1mm to 7mm, 1mm to 6mm, 2mm to 6mm, 3mm to 6mm, or 4mm to 6mm.

[0062] The support portion 130 can secure the dental fully sintered zirconia block 100 to the mandrel in such a way that it contacts the upper surface of the mandrel face to face. For example, an adhesive can be used on the surfaces of the support portion 130 and the mandrel facing each other, or the dental fully sintered zirconia block 100 can be secured to the mandrel by means of additional setting parts engaging with grooves formed in the support portion 130 and the mandrel, respectively.

[0063] Figure 8 This is a front view showing a dental fully sintered zirconia block bonded to a mandrel according to an embodiment of the present disclosure.

[0064] Reference Figure 8The dental zirconia block 100 can be mounted on the mandrel 200 for use. During the processing of the dental zirconia block 100, the mandrel 200 serves to fix the dental zirconia block 100 to the processing apparatus. To facilitate the processing of the dental zirconia block 100, it is preferable to fix the dental zirconia block 100 to the mandrel 200 for use.

[0065] According to one embodiment of this disclosure, the core rod 200 is as follows: Figure 8 The illustrated core rod 200 may have a disc-shaped portion that contacts the lower surface of the support portion 130 of the dental zirconia block 100. It may also have a structure with a cylinder protruding vertically from the center of the disc-shaped portion, wherein the cylinder may have a concave and curved shape in the middle. However, the shape of the core rod 200 is not limited to this; its shape is not restricted to situations where it can support the dental zirconia block 100 while facilitating its machining. For example, the upper part of the core rod 200 may be a non-disc-shaped rectangle or ellipse, and the lower part connected to the upper part of the core rod 200 may be a non-cylindrical handle-shaped portion with multiple grooves.

[0066] There are no particular limitations on the method of mounting the dental zirconia block 100 on the mandrel 200. For example, the dental zirconia block 100 can be fixed to the mandrel 200 by adhesives or the like. Furthermore, a groove can be chiseled into the upper center of the mandrel 200 to secure additional mounting components, and these components can be extended and positioned within the groove formed in the center of the support portion 130. Therefore, the mandrel 200 and the dental zirconia block 100 can also be connected and fixed.

[0067] According to one embodiment of this disclosure, a dental product comprising the above-described fully sintered zirconia block for dental use can be provided. The dental product may include dental restorations, orthodontic products, or dental implant products. Dental restorations may include, for example, crowns, dentures, etc. Orthodontic products may be, for example, orthodontic brackets. Dental implant products may be, for example, dental implant crowns.

[0068] Preferred embodiments of the present invention have been described above, but the present invention is not limited thereto. Various modifications can be made to implement the invention within the scope of the claims, the detailed description of the invention, and the accompanying drawings, and these modifications are obviously also within the scope of the present invention.

Claims

1. A dental fully sintered zirconia block, comprising: The subject that serves as the object of processing; A concave portion is connected to the underside of the main body; as well as The support portion is connected to the concave portion. The concave portion maintains a predetermined lateral length from the main body to the support portion, and the lateral length of the concave portion is more than 2 mm and less than 4 mm.

2. The dental sintered zirconia block according to claim 1, wherein, The portion where the concave part connects to the main body and the portion where the concave part connects to the support part each include a rounded curved portion.

3. The dental fully sintered zirconia block according to claim 1, wherein, The cross-section parallel to the length direction of the main body includes rounded corners. The radius of curvature of the rounded corner is between 0.5 mm and 10 mm.

4. The dental fully sintered zirconia block according to claim 1, wherein, The lateral length of the main body is 10mm to 16mm.

5. The dental fully sintered zirconia block according to claim 2, wherein, The radius of curvature of the rounded bend is 0.5 mm to 2 mm.

6. The dental fully sintered zirconia block according to claim 1, wherein, The vertical length of the concave portion is 1 mm to 10 mm.

7. The dental fully sintered zirconia block according to claim 1, wherein, The vertical length of the support is 2mm to 8mm.

8. The dental fully sintered zirconia block according to claim 1, wherein, The cross-section perpendicular to the length direction of the main body has a quadrilateral shape including rounded corners.

9. A dental product comprising: The dental fully sintered zirconia block according to any one of claims 1 to 8.

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