denture base

Abstract

The utility model provides a false tooth blank (1), including tooth colour part (3) and gum colour part (2), the concave cavity (4) that is overall in the gum colour part (2) is formed with the bow shape, the concave cavity (4) includes the multiple sub concave cavities (5) of continuous arrangement along the trend of dental arch, and the rib portion (6) is separated between two adjacent sub concave cavities (5). At least in the area of forming incisor, the bottom surface of sub concave cavity (5) includes the first section (7) near the outer edge side and the second section (8) near the inner edge side, the angle between the first section (7) and reference plane (10) is less than the angle between the second section (8) and reference plane (10), the depth of sub concave cavity (5) near the outer edge side is greater than the depth near the inner edge side, and the lowest point connection line forms the bending part (9) at the junction of first section (7) and second section (8). By this, the difference of natural gum margin line in the lip and tongue direction is simulated, and the false tooth beautiful degree of simulation is improved.

Description

Technical Field

[0001] This utility model relates to the field of dental prosthesis technology. Specifically, this utility model relates to a denture blank for manufacturing dentures. Background Technology

[0002] Dental prostheses are typically disc-shaped and composed of gingival-colored and tooth-colored materials. Arch-shaped cavities are formed within the gingival-colored portion, comprising multiple sub-cavities arranged continuously along the dental arch. Each sub-cavity is used to accommodate tooth-colored material to form a tooth. Adjacent sub-cavities are separated by ribs, which correspond to the spaces between teeth.

[0003] The shape of the bottom surface of the subcavity directly determines the shape of the boundary line between the tooth-colored material and the gingival-colored material in the fabricated denture—that is, the gingival margin. The gingival margin is a key visual element in whether the denture looks natural or not; therefore, the shape of the bottom surface of the subcavity needs to simulate the gingival margin characteristics of natural teeth as much as possible.

[0004] A prosthetic blank is known in which the boundary between the gingival and tooth-colored materials is wavy when viewed along the dental arch and radially when viewed along the vestibular direction. The crests and troughs of the wavy lines extend radially outward from the radial center, such that at the same angular position, the crests and troughs are positioned at the same height along the radial distribution. This radial structure allows for the automatic generation of a gingival margin line corresponding to the natural gingival margin when milling the dental arch at different radial positions.

[0005] Another type of denture blank is also known, in which the interfaces between materials extend radially from the radial center in the incisor region, while in the molar region, the interfaces have grooves and ribs that are parallel to each other. This design improves chewing function and incisor aesthetics for different dental arch sizes.

[0006] However, in the known schemes described above, regardless of whether a radial or parallel structure is used, the bottom surface of the sub-cavity extends in a straight line in the radial direction from the inner edge to the outer edge. That is, when a plane passing through the lowest point of the sub-cavity and containing the radial line pointing from the inner edge to the outer edge is cut, the line connecting the lowest points of the sub-cavity appears as a straight line, and the rate of change of depth at all points in the radial direction remains constant.

[0007] In natural human teeth, the gingival margin on the labial side is lower than that on the lingual side, meaning there is a significant difference in height between the labial and lingual gingival margins. Current designs, where the bottom surface of the cavity extends in a straight line, result in the labial and lingual gingival margins being at the same height in the fabricated dentures. This fails to reflect the natural difference in gingival margin height between the labial and lingual sides, leading to insufficient aesthetic realism in the dentures. Utility Model Content

[0008] To address the problem in existing prosthetic blanks where the bottom surface of the sub-cavities extends linearly in the radial direction, resulting in identical or nearly identical gingival margin heights on the labial and lingual sides of the manufactured prosthesis, and insufficient realism of the lingual gingival margin, an embodiment of this invention provides a prosthetic blank comprising a tooth-colored portion and a gingival-colored portion. The gingival-colored portion forms a cavity that is arch-shaped in a reference plane. The cavity includes multiple sub-cavities arranged continuously along the dental arch, with adjacent sub-cavities separated by ribs. At least in the region where the cavity forms the incisor, the sub-cavities... The bottom surface includes a planar first segment near the outer edge of the arc-shaped cavity and a planar second segment near the inner edge of the arc-shaped cavity, the first segment and the second segment being connected to each other; wherein, the angle between the first segment and the reference plane is smaller than the angle between the second segment and the reference plane, and the depth of the sub-cavity near the outer edge is greater than the depth of the sub-cavity near the inner edge; when viewed by a plane passing through the lowest point of the sub-cavity and containing a radial line from the inner edge to the outer edge, the sub-cavity forms a bend at the junction of the first segment and the second segment.

[0009] By using the aforementioned denture blank, and by making the bottom surface of the sub-cavity no longer extend in a straight line in the radial direction, but instead include a first segment and a second segment with different angles and forming a bend at the junction, the depth of the sub-cavity near the outer edge (corresponding to the labial side) can be greater than the depth near the inner edge (corresponding to the lingual side). This simulates the difference in height between the labial and lingual sides of the natural gingival margin in the fabricated denture, improving the aesthetics and realism of the denture, especially the lingual side.

[0010] Preferably, the first segment is parallel to the reference plane, the second segment is inclined relative to the reference plane, and the bend is located in the central region along the radial direction from the inner edge to the outer edge of the sub-cavity. This allows the depth of the first segment to remain constant near the outer edge, facilitating the formation of a uniform tooth-colored material layer in this area. Simultaneously, the inclination of the second segment causes the depth to gradually decrease from the bend towards the inner edge, more accurately simulating the gradual transition of the natural gingival margin from the labial to the lingual side. The bend being located in the central region ensures that the deeper area on the outer edge and the shallower area on the inner edge each occupy a corresponding proportion of the bottom surface of the sub-cavity, maintaining the labial depth difference while preventing the inner edge from being too shallow and affecting the capacity for tooth-colored material.

[0011] In some embodiments, the angle between the second segment and the reference plane is at least 3 degrees greater than the angle between the first segment and the reference plane. This angular difference ensures that the second segment has a significant tilt relative to the first segment, thereby creating a clear depth gradient on the bottom surface of the sub-cavity, which is beneficial for presenting a more pronounced difference in the height of the labial and lingual gingival margins in the fabricated denture.

[0012] In some embodiments, the angle of the second segment relative to the reference plane is between 5 and 30 degrees. This angle range can accommodate the differences in gingival margin height among most patients, ensuring both visible height differences on the labial and lingual gingival margins and avoiding insufficient depth on the inner edge due to excessive tilt angle.

[0013] Preferably, the bend includes a curved surface to allow a smooth transition between the first segment and the second segment.

[0014] Preferably, when viewed along the direction of the dental arch, the bottom surfaces of the multiple sub-cavities form the troughs of a waveform, and the tops of the ribs form the peaks of the waveform. The tops of the ribs extend in a straight line in the radial direction from the inner edge to the outer edge, and the sides of the ribs smoothly transition to the bottom surfaces of adjacent sub-cavities. By ensuring that the tops of the ribs extend in a straight line in the radial direction, the separation between adjacent sub-cavities is ensured to be radially uniform, which is beneficial for the uniform filling of the tooth-colored material during injection molding. The smooth transition between the sides of the ribs and the bottom surfaces of the sub-cavities results in a natural gingival morphology in the gaps between the teeth in the manufactured prosthesis.

[0015] Preferably, the rib extends from its top two sides at acute angles to each other towards the bottom of the sub-cavity in a planar manner, and the sides of the rib smoothly transition with the first and second sections of the sub-cavity through curved surfaces. The cross-section of such a rib corresponds to the shape of the gingiva, making the gingival morphology between adjacent teeth in the fabricated denture more natural.

[0016] Preferably, the bow-shaped cavity includes 14 sub-cavities, which are symmetrically arranged about the center line of the bow-shaped cavity. When the bow-shaped cavity is viewed from above perpendicular to the reference plane, the highest point of the symmetrical ribs is in a straight line, and the intersection of the extension lines of the highest point of the straight line is located on the center line.

[0017] In some embodiments, each sub-cavity has a planar first segment and a planar second segment. The sub-cavities are symmetrically arranged about the centerline of the arch-shaped cavity. The first segment forms with a depth gradient along the direction of the dental arch, with the first segment of the sub-cavity corresponding to the central incisor being the deepest, gradually becoming shallower towards the sub-cavity forming the last molar. This allows the blank to reflect a natural gradient trend in gingival margin height from the incisor region to the posterior region at the overall level, adapting to the lower labial gingival margin of the anterior region, while the outer edge of the sub-cavities in the corresponding posterior region has a smaller depth, adapting to the anatomical features of the posterior region where the gingival margin height difference is smaller.

[0018] In some embodiments, the tooth-colored portion is injection-molded into the arched cavity of the gingival portion, and the tooth-colored portion is shaped to fit the arched cavity. Through injection molding, the tooth-colored material can tightly fill every detail of the arched cavity, including the curved transition areas of the bends, ensuring a tight bond and precise shape match between the two layers of material. Attached Figure Description

[0019] To gain a more complete understanding of the present invention, reference can be made to the following description of exemplary embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 A schematic diagram of the tooth-colored portion of a denture blank according to an embodiment of the present invention is shown.

[0020] Figure 2 A schematic diagram of the gingival color portion of a denture blank according to an embodiment of the present invention is shown, wherein a portion of the tooth color portion is cut off.

[0021] Figure 3 A perspective cross-sectional view of the gingival color portion of a denture blank according to an embodiment of the present invention is shown, wherein a radial section forming the sub-cavity of the central incisor is shown.

[0022] Figure 4 Another sectional perspective view of the gingival colored portion of a denture blank according to an embodiment of the present invention is shown.

[0023] Figure 5 A perspective cross-sectional view of the gingival color portion of a denture blank according to an embodiment of the present invention is shown, wherein a radial section of the sub-cavity forming the canine is shown.

[0024] Figure 6 A perspective cross-sectional view of the gingival color portion of a denture blank according to an embodiment of the present invention is shown, wherein a radial section forming the sub-cavity of the second premolar is shown.

[0025] Figure 7 A schematic diagram of a denture blank according to an embodiment of the present invention is shown.

[0026] List of reference numerals

[0027] 1. Dental blank

[0028] 2. Gingival color

[0029] 3. Teeth color

[0030] 4. Cavity

[0031] 5 sub-cavities

[0032] 6. Ribs

[0033] 7. First Section

[0034] 8. Second Part

[0035] 9. Bending section

[0036] 7' Third paragraph

[0037] 8' Fourth Section

[0038] 9' Corresponding to the bend

[0039] 10 Reference Plane

[0040] 11 Centerline Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0042] Although the following description uses a complete denture blank as an example to illustrate the embodiments of the present invention, the denture blank of the present invention can also be applied to partial dentures, dental implant restorations, and other dental restorative devices that require a double-layer material structure.

[0043] In this invention, the term "gingival color portion" refers to the material portion in the denture blank used to form the denture base (i.e., the gingival portion), whose color corresponds to the color of human gums. It is usually based on resin material, but this is not limiting, and other suitable dental base materials can also be used.

[0044] In this invention, the term "tooth-colored portion" refers to the material portion in the denture blank used to form teeth, the color of which corresponds to the color of human teeth. It is usually based on resin material, but this is not limiting, and other suitable dental materials may also be used.

[0045] In this invention, the term "sub-cavity" refers to the recessed portion within an arch-shaped cavity used to accommodate tooth-colored material to form a single tooth. The term "rib" refers to the protruding portion between adjacent sub-cavities, corresponding to the gingiva between teeth.

[0046] In this invention, the term "outer edge side" refers to the side of the arch-shaped cavity near the outer periphery of the blank, corresponding to the labial side (vestibular side) of the teeth in the manufactured denture; the term "inner edge side" refers to the side of the arch-shaped cavity near the center of the blank, corresponding to the lingual or palatal side of the teeth in the manufactured denture.

[0047] In this invention, the term "radial direction" refers to the direction of the arc-shaped cavity from the inner edge to the outer edge.

[0048] In this invention, the term "bending portion" refers to the transitional bending area formed at the junction of the first and second segments on the bottom surface of the sub-cavity, so that the bottom surface of the sub-cavity no longer extends in a straight line in the radial direction, but instead exhibits an angular change.

[0049] In this invention, the term "dental arch orientation" refers to the direction in which each tooth in the fabricated denture is arranged along the dental arch arc.

[0050] The embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0051] like Figure 7 As shown, the denture blank 1 according to this utility model is generally disc-shaped, preferably circular, and is usually made of resin material. The denture blank 1 mainly includes two parts: the gingival-colored part 2 and the tooth-colored part 3.

[0052] Figure 1 A schematic diagram of the tooth-colored portion 3 of a denture blank 1 according to an embodiment of the present invention is shown. Figure 2 A schematic diagram of a portion of the gingival color portion 2 of a denture blank 1 according to an embodiment of the present invention is shown. Figure 1 The tooth-colored portion 3 of the denture blank 1 shown is... Figure 2 The gingival color portion 2 shown has complementary mating surfaces.

[0053] like Figure 2 As shown, a recess or cavity 4 is formed in the gingival portion 2. In the plane of the disc-shaped blank, the cavity 4 is generally arc-shaped, and the cavity 4 has an undulating shape along the arc-shaped trend. The cavity 4 includes a plurality of sub-cavities 5 arranged continuously along the arc-shaped trend, and adjacent sub-cavities 5 are separated by ribs 6. Each sub-cavity 5 is used to accommodate tooth-colored material to form a tooth in subsequent processing. The ribs 6 correspondingly form the gingival portion between adjacent teeth.

[0054] In the gingival portion 2, the bottom of the cavity 4 (i.e., the bottom surface of the sub-cavity 5) has a special shape design. Specifically, the bottom surface of the sub-cavity 5 includes a first segment 7 near the outer edge of the cavity 4 and a second segment 8 near the inner edge of the cavity 4. The first segment 7 and the second segment 8 are planes at different angles and are connected to each other. The angle between the first segment 7 and the reference plane 10 is smaller than the angle between the second segment 8 and the reference plane 10, and the inclination direction of the second segment 8 makes its inner edge shallower than its outer edge. In this invention, the term "reference plane" refers to the plane on which the entire denture blank and the arched cavity extension therein are located, such as... Figure 4 As shown, in this plane, the bow-shaped cavity unfolds in a bow shape. The reference plane is used as a reference plane to measure the inclination angles of the first and second segments of the bottom surface of the sub-cavity. Preferably, the angle between the second segment and the reference plane 10 is at least 3 degrees larger than the angle between the first segment 7 and the reference plane 10.

[0055] According to this invention, at least in the sub-cavities 5 forming the incisor region, this radially connected two-segment bottom surface shape is adopted, and more preferably, each sub-cavity adopts this two-segment connected bottom surface shape.

[0056] Figure 3 and Figure 4 A cross-sectional perspective view of the gingival colored portion 2 of a denture blank 1 according to an embodiment of the present invention is shown from different angles, showing a radial section of the sub-cavity 5 forming the central incisor (tooth number 1). The cutting plane is generally cut through a plane passing through the lowest point of the sub-cavity 5 forming tooth number 1, including a radial line from the inner edge to the outer edge, and normal to the reference plane 10. From Figure 3 and Figure 4 As can be seen, the line connecting the lowest points of the sub-cavity 5 forms a bend 9 at the junction of the first segment 7 and the second segment 8. That is, when viewed in cross-section with a plane passing through the lowest point of the sub-cavity 5 and including a radial line pointing from the inner edge to the outer edge, the sub-cavity 5 forms a bend 9 at the junction of the first segment 7 and the second segment 8. This bend 9 smoothly connects the first segment 7 and the second segment 8, causing the bottom surface of the sub-cavity 5 to transition from a plane with a smaller slope (near the outer edge of the cavity 4) to a plane with a larger slope (near the inner edge of the cavity 4). Because the inner edge of the second segment 8 slopes upward (i.e., closer to the mating surface), the depth of the sub-cavity 5 near the inner edge is less than the depth near the outer edge.

[0057] On the other hand, in the radial direction from the inner edge to the outer edge of the sub-cavity 5, the bend 9 is preferably located approximately in the middle. The bend 9 includes a curved surface to allow a smooth transition between the first segment 7 and the second segment 8. This avoids sharp edges at the bend, facilitates the flow and filling of resin material at the bend during injection molding, and also makes the transition of the gingival margin in the labial-lingual direction in the manufactured denture more natural.

[0058] In a specific embodiment, the first segment 7 has an inclination angle of less than or equal to 3 degrees relative to the reference plane 10, preferably parallel to the reference plane 10. The second segment 8 has an inclination angle of 5 to 30 degrees relative to the reference plane 10, preferably 25 degrees. Preferably, the radial length of the first segment 7 at the bottom of the sub-cavity 5 is at least 5 mm, preferably 5-8 mm. The radial length of the second segment 8 at the bottom of the sub-cavity 5 is at least 5 mm, preferably 5-8 mm.

[0059] In a preferred embodiment, each sub-cavity 5 of the cavity 4 adopts the bottom surface shape of a radially two-segment sub-cavity. Figure 5 and Figure 6 Radial cross-sections of the sub-cavity 5 forming the canine (tooth number 3) and the sub-cavity 5 forming the premolar (tooth number 5) are shown, illustrating the structure of the bent portion 9 in the sub-cavities 5 at different locations. It can be seen that each sub-cavity 5 at different locations possesses a planar first segment 7, a planar second segment 8, and a curved bent portion 9, maintaining a consistent basic shape. The bent portion 9 of each sub-cavity smoothly connects the first segment 7 and the second segment 8 in a radial direction from the inner edge to the outer edge.

[0060] Viewed along the direction of the dental arch, the bottom surfaces of the multiple sub-cavities 5 form the troughs of the waveform, while the tops of the ribs 6 form the crests of the waveform. Preferably, the tops of the ribs 6 extend in a straight line in the radial direction from the inner edge to the outer edge, and preferably all the straight tops are on the same plane.

[0061] Rib 6 extends from its top two sides at acute angles toward the sub-cavity 5 in a planar manner, with a smooth transition between the sides of rib 6 and the bottom surface of the sub-cavity (i.e., the first and second segments) via a curved surface. The cross-section of such rib 6 corresponds to the shape of the gingiva, making the gingival morphology between adjacent teeth in the fabricated denture more natural.

[0062] In the illustrated embodiment, the cavity 4 includes 14 sub-cavities 5, corresponding to the standard number of teeth in a complete denture. The sub-cavities 5 are arranged symmetrically about the center line 11 of the cavity 4. When the cavity 4 is viewed from above, the highest point of the symmetrical ribs 6 is in a straight line, and the intersection of the extensions of the highest points of this straight line is located on the center line 11.

[0063] The arch-shaped cavity 4 of the denture blank 1 includes 14 sub-cavities 5, corresponding to the standard number of teeth in a complete denture. These 14 sub-cavities 5 are symmetrically arranged about the centerline 11 of the cavity 4, with 7 sub-cavities 5 on each side of the centerline 11, corresponding to the central incisors, lateral incisors, canines, and four molars, respectively. On one side of the centerline 11, the first segment 7 of each sub-cavity 5 is not formed on the same plane, but rather exhibits a depth gradient along the direction of the dental arch: the first segment 7 of the sub-cavity corresponding to the central incisor closest to the centerline 11 is the deepest, gradually becoming shallower from the sub-cavities of the lateral incisors towards the sub-cavities forming the last molar. Here, depth refers to the distance of the plane of the first segment 7 relative to the top of the adjacent rib.

[0064] This depth gradient design along the direction of the dental arch allows the blank to reflect a natural gradient trend in gingival margin height from the incisor region to the posterior region. In subsequent CAD / CAM processing, no additional adjustments are needed to directly obtain dentures where the gingival margin height differences of each tooth position conform to anatomical characteristics, thereby further improving the overall aesthetic realism of the denture.

[0065] For the tooth-colored portion 3, since the tooth-colored portion 3 forms a shape that matches the cavity 4 of the gingival portion 2, the lower surface of the tooth-colored portion 3 has a shape that matches the bottom surface of the sub-cavity 5. Specifically, the lower surface of the tooth-colored portion 3 includes a third segment 7' that matches the first segment 7, a fourth segment 8' that matches the second segment 8, and a corresponding bent portion 9' that matches the bent portion 9. The third segment 7' and the fourth segment 8' are planes with different angles, so that the tooth-colored portion 3 can be tightly accommodated in the cavity 4.

[0066] During the manufacturing process, the tooth-colored portion 3 is formed by injection molding: tooth-colored resin material is injected into the gingival portion 2, which has already formed a cavity 4, so that the tooth-colored material fills each sub-cavity 5 and solidifies.

[0067] This invention addresses the issue that in natural human teeth, the gingival margin on the labial side is lower than that on the lingual side, meaning there is a significant difference in height between the labial and lingual gingival margins. However, existing denture blanks cannot accurately replicate the morphology of the lingual gingival margin. By introducing a bend in the bottom surface of the sub-cavity of the denture blank, the bottom surface of the sub-cavity no longer extends in a straight line from the outer to the inner edge, but is divided into a first segment and a second segment with different angles. This allows for a basic structure in the blank where the labial depth is greater than the lingual depth, thus enabling the direct generation of dentures with a height difference between the labial and lingual gingival margins that more closely resembles natural teeth during subsequent processing. In particular, it significantly improves the realism of the lingual gingival margin in the resulting denture.

[0068] Regardless of whether a radial structure extending radially from the radial center is used, or a hybrid structure that radiates in the incisor region and runs parallel in the molar region, the bottom surface of the sub-cavity extends in a straight line in the radial direction, and the line connecting the lowest points of the sub-cavities is a straight line, resulting in the labial and lingual gingival margins of the fabricated dentures being at the same height. In comparison, this invention improves the realism of simulating the height difference of the gingival margin in the labial and lingual directions by changing the shape of the bottom surface extending in a straight line in the radial section through the bending part.

[0069] When manufacturing dentures using the denture blank 1 according to this invention, the precise orientation of the denture base formed by the gingival color portion can be determined using a CAD / CAM device based on the patient's specific oral scan data, and the milling machine can be controlled to process the blank. Since the bottom surface of the concave cavity in the blank already includes the bending structure, milling can directly produce dentures with differences in the height of the labial and lingual gingival margins, achieving an aesthetically pleasing gingival margin without much adjustment.

[0070] Although the above description uses a disc-shaped blank for complete dentures as an example, it should be understood that the denture blank of this invention can also be applied to partial dentures and other types of dental restorations, as long as these restorations need to simulate the height difference of the natural gingival margin in the labial and lingual direction.

[0071] The foregoing description has already given many features and advantages, including various alternative implementations, as well as details of the structure and function of the device. This document is intended to be exemplary and is not exhaustive or limiting.

[0072] It will be apparent to those skilled in the art that various modifications can be made within the full scope indicated by the broad superordinate meaning of the terms expressed in the appended claims, particularly in terms of structure, materials, elements, components, shapes, dimensions, and arrangements of components, including combinations of these aspects within the scope of the principles described herein. Such various modifications are intended to be included herein, provided they do not depart from the spirit and scope of the appended claims.

Claims

1. A denture blank comprising a tooth-colored portion (3) and a gingival-colored portion (2), wherein the gingival-colored portion (2) has an arch-shaped cavity (4) in a reference plane (10); the cavity (4) comprises a plurality of sub-cavities (5) arranged continuously along the dental arch, and adjacent sub-cavities (5) are separated by ribs (6); Its features are, At least in the region where the incisor is formed in the cavity (4), the bottom surface of the sub-cavity (5) includes a planar first segment (7) near the outer edge of the arched cavity (4) and a planar second segment (8) near the inner edge of the arched cavity (4), the first segment (7) and the second segment (8) being connected to each other. Wherein, the angle between the first segment (7) and the reference plane (10) is smaller than the angle between the second segment (8) and the reference plane (10), and the depth of the sub-cavity (5) near the outer edge is greater than the depth of the sub-cavity (5) near the inner edge; When viewed by a plane passing through the lowest point of the sub-cavity (5) and including a radial line pointing from the inner edge to the outer edge, the sub-cavity (5) forms a bend (9) at the junction of the first segment (7) and the second segment (8).

2. The denture blank according to claim 1, characterized in that, The first segment (7) is parallel to the reference plane (10), and the second segment (8) is inclined relative to the reference plane (10). Furthermore, in the radial direction from the inner edge to the outer edge of the sub-cavity (5), the bent portion (9) is located in the central region.

3. The denture blank according to claim 1, characterized in that, The angle between the second segment (8) and the reference plane (10) is greater than the angle between the first segment (7) and the reference plane (10), and the difference between the two angles is at least 3 degrees.

4. The denture blank according to claim 1 or 3, characterized in that, The first segment (7) has an inclination angle of less than or equal to 3 degrees relative to the reference plane (10), and the second segment (8) has an angle between 5 degrees and 30 degrees relative to the reference plane (10).

5. The denture blank according to claim 1, characterized in that, The bent portion (9) includes a curved surface to allow a smooth transition between the first segment (7) and the second segment (8) via the curved surface.

6. The denture blank according to claim 1, characterized in that, When viewed along the direction of the dental arch, the bottom surfaces of the multiple sub-cavities (5) form the troughs of the waveform, and the top of the rib (6) forms the peaks of the waveform. The top of the rib (6) extends in a straight line in the radial direction from the inner edge to the outer edge, and the side surface of the rib (6) smoothly transitions to the bottom surface of the adjacent sub-cavities (5).

7. The denture blank according to claim 1 or 6, characterized in that, The rib (6) extends from its top to the bottom of the sub-cavity in a planar manner on two sides at acute angles to each other, and the sides of the rib (6) are smoothly transitioned to the first and second sections of the sub-cavity by a curved surface.

8. The denture blank according to claim 1, characterized in that, The bow-shaped cavity (4) includes 14 sub-cavities (5), which are symmetrically arranged about the center line (11) of the bow-shaped cavity (4). When the bow-shaped cavity (4) is viewed from above, the highest point of the symmetrical ribs (6) is in a straight line, and the intersection of the extension lines of the highest point of the straight line is located on the center line (11).

9. The denture blank according to claim 1, characterized in that, Each of the sub-cavities (5) has a planar first segment (7) and a planar second segment (8), and the sub-cavities (5) are arranged symmetrically about the centerline (11) of the arcuate cavity (4). The first segment is formed along the direction of the dental arch, and the first segment (7) of the sub-cavity corresponding to the central incisor closest to the center line (11) is the deepest in plan, and gradually becomes shallower towards the sub-cavity (5) that forms the last molar.

10. The denture blank according to claim 1, characterized in that, The tooth-colored portion (3) is injected into the arched cavity (4) of the gingival portion (2), and the tooth-colored portion (3) forms a shape that matches the arched cavity (4).

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