Superstructure, method for fabricating the same, and dental prosthesis using the same

Abstract

The present invention provides a superstructure that suppresses the generation of unpleasant occlusal sounds while also offering superior aesthetics and restorative properties. [Solution] A superstructure used during full-mouth treatment, comprising a frame-shaped zirconia base having a plurality of protruding support parts, a plurality of zirconia crown parts each supported by the respective support parts, a gingival portion built up on the base, and a joining structure for joining the base and the crown parts, wherein the gingival portion is raised at least on the side between adjacent support parts, the plurality of support parts are arranged apart from each other with the raised part in between, the crown part includes an opening and a housing space for housing the base, the joining structure includes an adhesive layer for bonding the outer surface of the base and the inner surface of the support parts, and an adhesion region where the outer surface of the base and the inner surface of the support parts are in close contact with each other, the adhesion region is provided on the inner surface of the crown part at the opening edge of the crown part, and the adhesive layer is formed over the inner surface of the crown part excluding the adhesion region.

Description

Technical Field

[0001] The present disclosure relates to a superstructure used, for example, during full-arch treatment, a method for manufacturing the same, and a dental prosthesis using the same.

Background Art

[0002] For full-arch treatment (so-called full-mouth treatment), for example, a dental prosthesis including a superstructure provided with a plurality of artificial teeth continuously is used. In such a superstructure, as a material constituting the artificial teeth, monolithic zirconia (so-called monolithic zirconia) having excellent biocompatibility and aesthetics may be used (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a conventional superstructure made of monolithic zirconia, since the frame and the artificial tooth portion are integrally formed, the impact during occlusion cannot be sufficiently absorbed, and when the upper and lower artificial tooth portions come into contact, a characteristic high-pitched clicking sound (occlusion sound) of zirconia is generated, which may give discomfort to the user. In addition, since a plurality of artificial teeth are formed as a continuous artificial tooth row, there is a lack of a sense of independence for each tooth, and not only is it impossible to sufficiently reproduce an aesthetics close to a natural tooth row, but partial repair is difficult when a part of the artificial teeth is damaged. Therefore, an object of the present disclosure is to provide a superstructure that suppresses the generation of an unpleasant occlusion sound and has excellent aesthetics and reparability.

Means for Solving the Problems

[0005] A superstructure according to one aspect of the present disclosure is a superstructure used in full-mouth treatment, comprising a frame-shaped zirconia base having a plurality of protruding support portions, a plurality of zirconia crown portions supported by each of the support portions, a gingival portion built up on the base, and a joint structure that joins the base and the crown portions, wherein the gingival portion is raised at least on the side between adjacent support portions, the plurality of support portions are arranged apart from each other with the raised portion in between, and the crown portions have an opening and Support part The joint structure includes a storage space for accommodating the Support part The outer surface and the crown of tooth An adhesive layer that adheres to the inner surface of the and the Support part The outer surface and the crown of tooth The adhesive layer includes an adhesive region in which the inner surface and the adhesive layer are in close contact with each other, the adhesive region being provided on the inner surface of the tooth crown portion, specifically at the opening edge of the tooth crown portion, and the adhesive layer being formed over the inner surface of the tooth crown portion excluding the adhesive region. [Effects of the Invention]

[0006] According to this disclosure, it is possible to provide a superstructure that suppresses the generation of unpleasant occlusal sounds and has excellent aesthetic and restorative properties. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram showing an example of a superstructure according to the embodiment, where (a) is a front view and (b) is a bottom view. [Figure 2] Figure 2 illustrates the joint state between the support portion and the crown of the superstructure according to the embodiment, where (a) is a plan view, (b) is a front view, (c) is a rear view, and (d) is a bottom view. [Figure 3] Figure 3 is a schematic cross-sectional view showing the cross-sectional structure of the superstructure according to the embodiment. [Figure 4] Figure 4 is a flowchart showing the method for fabricating the superstructure according to the embodiment. [Figure 5] Figure 5 is a schematic cross-sectional view showing the cross-sectional structure of the superstructure according to the modified example. [Modes for carrying out the invention]

[0008] Examples of the superstructure, method of fabricating the same, and dental prostheses using the same as described herein will be explained below with reference to the drawings. However, this disclosure is not limited to these examples and is intended to include all modifications within the meaning and scope of the claims as indicated by the claims. Furthermore, the superstructure according to this embodiment is applicable to both the upper and lower jaws, but since the configuration of both is the same, for the sake of convenience, the superstructure for the upper jaw will be described below as an example. Furthermore, the scale of each part in the drawings may differ from the actual scale for the sake of ease of understanding. For the sake of drawing convenience, in Figures 1 to 4, only some parts may be labeled with reference numerals, while the reference numerals for others may be omitted. [Examples]

[0009] ≪Dental Prosthesis 1≫ The dental prosthesis 1 comprises a fixture embedded in the alveolar bone of the jawbone, a superstructure 10 fixed to the proximal end of the fixture, an abutment connecting the fixture and the superstructure 10 and positioned to penetrate the gingiva, a screw for fixing the abutment and the fixture, and a prosthetic screw for fixing the abutment and the superstructure 10. The dental prosthesis 1 according to this embodiment is used in full-mouth treatment methods such as All-on-4, All-on-5, and All-on-6. Furthermore, known structures and materials can be used for fixtures, abutments, screws, and prosthetic screws.

[0010] <Superstructure 10> Figure 1 is a schematic diagram showing an example of the superstructure 10 according to this embodiment, where (a) is a front view and (b) is a bottom view. Figure 2 is a diagram illustrating the joint state between the support portion 120 and the crown 200 of the superstructure 10 according to this embodiment, where (a) is a top view, (b) is a front view, (c) is a rear view, and (d) is a bottom view. The superstructure 10 will be described below with reference to Figures 1 and 2. The superstructure 10 comprises a frame (base) 100 made solely of zirconia, a gingival portion 300, and a crown (tooth crown portion) 200 made solely of zirconia. The crown 200 and the frame 100 are joined by a joining structure 400, which will be described later. The frame 100 is integrally formed and includes a plurality of support portions 120 protruding from the gingival portion 300 in the occlusal direction OD, and a plurality of through holes 140 provided for screw fixation. The occlusal direction OD refers to the occlusal direction in which the maxillary superstructure 10 and the mandibular superstructure 10 come into contact during occlusion, as shown in Figures 1(a) and 2(b).

[0011] Each of the multiple support parts 120 is a part that supports the crown 200, and is formed with a predetermined interval between adjacent support parts 120. Approximately 12 of these support parts 120 are provided, and the shape of each support part 120 is formed to match the shape characteristics of the artificial tooth (for example, a molar or anterior tooth) that will be joined at that position.

[0012] The multiple through-holes 140 are formed according to the number of screws used, and each through-hole 140 extends along the occlusal direction OD and penetrates to the abutment side. When four screws are used, for example, these through-holes 140 are located near the center and both left and right ends of the superstructure 10.

[0013] The gingival part 300 corresponds to the gum, and is formed by raising, for example, pink-colored ceramic on the frame 100. The gingival part 300 is formed so as to smoothly raise the periphery of the proximal end side (the side opposite to the occlusal direction OD) of each support part 120. The bulge 320 in Fig. 1 is where the gingival part 300 locally raises corresponding to the boundary part between adjacent support parts 120, and is formed so as to separate each support part 120 in the left-right direction. Thereby, each support part 120 is arranged at intervals from each other via this bulge 320.

[0014] The crown 200 is an independent tooth crown corresponding to each support part 120, and a plurality of them are formed individually. Also, each crown 200 has an opening 220 on the gingival part 300 side, and an accommodation space 260 for accommodating the support part 120 is formed inside it. The inner surface of the accommodation space 260 faces the outer surface of the support part 120 via the joining structure 400, and its shape is formed to substantially correspond to the outer shape of the support part 120. Furthermore, each crown 200 is formed with a thickness sufficient to interpose the joining structure 400 between it and the support part 120.

[0015] <Joining structure 400> Fig. 3 is a schematic cross-sectional view showing the cross-sectional structure of the upper structure according to this embodiment. As shown in Fig. 3, the joining structure 400 is provided between the outer surface of the support part 120 and the inner surface of the crown 200 to join the two, and has an adhesive layer 420 that adheres the outer surface of the support part 120 and the inner surface of the crown 200 with an adhesive, and a close contact region 440 where the outer surface of the support part 120 and the inner surface of the crown 200 are in close contact with each other.

[0016] The adhesion region 440 is a band-shaped area extending approximately 0.3 mm in height from the margin (opening edge) 240 of the crown 200 along the occlusal direction OD, where the outer surface of the support portion 120 and the inner surface of the crown 200 are in direct contact. In other words, in a portion of approximately 0.3 mm along the occlusal direction OD (upward) from the margin portion 240 of the crown 200, the two are in close contact with each other without the use of adhesive. In this embodiment, this adhesion region 440 is provided between the support portion 120 of the frame 100 on which the gingival portion 300 has been built up and the margin portion 240 of the crown 200.

[0017] The adhesive layer 420 is located on the upper side of the adhesion region 440, i.e., on the occlusal direction OD side, and is a layer formed between the outer surface of the support portion 120 and the inner surface of the crown 200. The adhesive layer 420 is formed from a resin-based cement such as an elastic superbond, and exerts its bonding function by interposing it in the gap between the two with a predetermined thickness. Furthermore, it is desirable that the adhesive layer 420 be formed to have as uniform a thickness as possible. The thickness of this adhesive layer 420 is in the range of about 0.015 mm to 0.1 mm, preferably about 0.023 mm, more preferably about 0.05 mm, and even more preferably in the range of about 0.08 mm to 0.1 mm.

[0018] Thus, in this embodiment, no adhesive is interposed in the portion corresponding to the margin portion 240, and the margin portion 240 and the support portion 120 are directly brought into close contact, while an adhesive layer 420 is interposed in the region on the upper side, thereby ensuring a secure bond between the crown 200 and the support portion 120.

[0019] According to the superstructure 10 of this embodiment, a contact area without adhesive is provided near the margin portion 240 of the crown 200, thereby suppressing adhesive leakage and improving the aesthetics of the superstructure 10. Furthermore, by using an elastic adhesive, the adhesive layer 420 acts as a buffer layer (a so-called stress breaker), distributing the load during occlusion. As a result, the generation of high-pitched occlusal sounds is suppressed, and a sinking sensation similar to that of natural teeth is reproduced, resulting in a natural biting feel. Furthermore, since each of the multiple crowns 200 is independently joined to the support portion 120, the crowns 200 are not integrated with each other, making it possible to reproduce the sense of individuality of each tooth, similar to that of a natural dentition.

[0020] ≪Method for fabricating the superstructure 10≫ Next, we will explain how to manufacture the superstructure 10. Figure 4 is a flowchart showing the method for manufacturing the superstructure 10 according to this embodiment.

[0021] <Preparation process for frame 100> S110: A zirconia disc is cut using, for example, a CAD / CAM device to form a frame shape in which the portion where the gingival portion 300 is built up and multiple support portions 120 are integrally formed. For the frame 100, for example, a 3Y zirconia disc is used as the material. By high-temperature sintering the cut frame 100, a sintered body with the desired strength and dimensional accuracy is obtained. After sintering, the outer surface of the support portions 120 is sandblasted to uniformize the surface roughness, thereby increasing the adhesive strength in subsequent processes. In addition, the outer surface of the gingival portion 300 that comes into contact with the user's gums is given a mirror polish finish. Frame 100 is manufactured through the above process.

[0022] <Preparation process for the Crown 200> S120: Based on the three-dimensional shape data of each support portion 120 of the frame 100, the crown 200 is formed by precision cutting using, for example, a CAD / CAM device. As the material for the crown 200, 4Y zirconia, which has excellent aesthetics, is used, but it is not limited to this, and 5Y zirconia, which has excellent transparency, may also be used. By high-temperature sintering the crown 200 after cutting, it is obtained as a sintered body having a housing space 260. After sintering, the surface treatment of the crown 200 is glazing to improve aesthetics. In addition, the OD side end of the crown 200 in the occlusal direction is finished by mirror polishing or hand polishing. Furthermore, the inner surface of the crown 200 is sandblasted to create a fine rough surface and increase the adhesive strength in subsequent processes. In addition, surface treatment with a special monomer promotes the chemical bonding between zirconia. A similar treatment may be applied to the outer surface of the support portion 120 of the frame 100. The thickness of the crown 200 is preferably in the range of approximately 1.0 mm to 1.2 mm. The Crown 200 is manufactured through the above process.

[0023] <Joining process between support part 120 and crown 200> S130: Crowns 200 are inserted into each support portion 120 and bonded together with adhesive interposed between them. Adhesive is applied to the inner surface of the crown 200 and bonded to the outer surface of the support portion 120, thereby forming an adhesive layer 420. On the other hand, the margin portion 240 of the crown 200 is fixed by directly adhering it to the outer surface of the support portion 120 without the interposition of adhesive, thereby forming an adhesion region. At this time, the adhesion region extends approximately 0.3 mm from the margin portion 240 of the crown 200 toward the occlusal direction OD, and a substantially uniform adhesive layer 420 with a thickness of, for example, 0.023 mm is provided above it. The crowns 200 are joined to each other, separated by the ridges 320 of the gingival portion 300.

[0024] In this way, the adhesive layer 420 functions as a buffer / stress breaker, absorbing the impact generated during occlusion and suppressing the generation of high-pitched occlusal sounds. Furthermore, the adhesion area near the margin 240 ensures a smooth and continuous boundary between the crown 200 and the gingival portion 300, improving aesthetics. Moreover, since multiple crowns 200 are independently bonded to the support portion 120, a sense of individuality for each tooth, similar to that of a natural dentition, can be reproduced. After this, the superstructure 10 is completed by cleaning and making minor adjustments to the shape of the occlusal surface as needed.

[0025] As described above, in this embodiment, the superstructure 10 used during full-mouth treatment has a frame-shaped zirconia base 100 having a plurality of protruding support parts 120, a plurality of zirconia crown parts supported by each support part 120, a gingival portion 300 built up on the base, and a joining structure 400 that joins the base and the crown parts, the gingival portion 300 has a raised 320 at least on the side between adjacent support parts 120, the plurality of support parts 120 are arranged apart from each other with the raised 320 in between, and the crown parts are open The joint structure 400 includes an opening 220 and a housing space 260 for housing the base, and includes an adhesive layer 420 for bonding the outer surface of the base and the inner surface of the support part 120, and an adhesion region 440 in which the outer surface of the base and the inner surface of the support part 120 are in close contact with each other. The adhesion region 440 is provided on the inner surface of the crown portion, specifically at the opening edge of the crown portion, and the adhesive layer 420 is provided on the inner surface of the crown portion excluding the adhesion region 440. As a result, it has excellent aesthetics and restorative properties, and can suppress the generation of unpleasant occlusal sounds.

[0026] Furthermore, even if a problem occurs with the superstructure 10, if the frame 100 is not damaged, the damaged tooth (crown 200) can be repaired individually. Also, by replacing the crown 200, the bite and occlusal vertical dimension can be adjusted. Specifically, while the occlusal vertical dimension of natural teeth tends to decrease with age and wear, conventional superstructures made of monolithic zirconia do not experience wear and the occlusal vertical dimension does not change, making it difficult to follow physiological changes in the temporomandibular joint and masticatory system over the long term. In contrast, with the superstructure 10 of this embodiment, only the crown 200 can be replaced while leaving the frame 100 in place, so the occlusal vertical dimension can be appropriately adjusted by replacing the crown 200, for example, every 5 years, in response to wear over time and changes in the temporomandibular joint.

[0027] ≪Variations≫ Figure 5 is a schematic cross-sectional view showing the cross-sectional structure of the superstructure 10 according to a modified example. In the modified example, as shown in Figure 5, the adhesive layer 420 is formed with a substantially uniform thickness selected from, for example, a range of 0.08 mm to 0.1 mm. In order to ensure the thickness of the adhesive layer 420, in the modified example, the thickness on the crown 200 side, rather than the support part 120 side, is reduced by the desired amount. The other components are the same as in the embodiment described above, so they are given the same reference numerals and their descriptions are omitted. In this way, by increasing the thickness of the adhesive layer 420, the adhesive layer 420 formed between the crown 200 and the support portion 120 functions as a cushion and acts as a stress breaker during occlusion. Furthermore, by interposing an adhesive layer 420 of sufficient thickness, frame breakage can be prevented and the durability of the superstructure 10 can be improved. [Explanation of Symbols]

[0028] 1. Dental prostheses 10 Superstructure 100 frames (base) 120 Support part 140 through holes 200 Crown (tooth crown) 220 aperture 240 Margin area (opening edge) 260 storage space 300 Gingival area 320 uplift 400 Joint structure 420 Adhesive layer 440 Close contact area OD Occlusal direction

Claims

1. A superstructure used during full-mouth treatment, comprising a frame-shaped zirconia base having multiple protruding support portions, multiple zirconia crown portions supported by each of the support portions, a gingival portion built up on the base, and a joining structure that connects the base and the crown portions, The gingival portion is raised at least on the side between adjacent support portions, The plurality of support parts are arranged apart from each other, with the protrusion in between. The crown portion includes an opening and a housing space for housing the support portion. The bonding structure includes an adhesive layer that bonds the outer surface of the support portion to the inner surface of the crown portion, and an adhesion region in which the outer surface of the support portion and the inner surface of the crown portion are in close contact with each other. The aforementioned contact region is provided on the inner surface of the tooth crown portion, specifically at the opening edge of the tooth crown portion. The adhesive layer is formed over the inner surface area of ​​the tooth crown, excluding the adhesion region. superstructure.

2. Each of the aforementioned tooth crowns is joined to the support portion in a state where they are separated from each other by the protrusions. The opening edge of the tooth crown is in close contact with the support portion without the adhesive layer, The aforementioned adhesive layer is formed from an elastic adhesive and provides a cushioning function during occlusion. The superstructure according to claim 1.

3. A method for fabricating a superstructure used in full-mouth treatment, comprising a frame-shaped base having a plurality of protruding support parts, a plurality of crown parts each supported by the respective support parts, a gingival part built up on the base, and a joining structure that joins the base and the crown parts, The crown portion is inserted into the support portion, and an adhesive layer made of elastic adhesive is formed on the inner surface of the crown portion, excluding a range of 0.3 mm in height from the opening edge of the crown portion along the occlusal direction, with a substantially uniform thickness selected from the range of 0.015 mm to 0.1 mm, thereby bonding the support portion and the crown portion. A step of joining the support portion and the tooth crown portion by bringing the inner surface of the tooth crown portion and the outer surface of the support portion into close contact with each other in a range of 0.3 mm in height along the occlusal direction from the opening edge of the tooth crown portion, A method for fabricating a superstructure that includes at least the following.

4. A dental prosthesis obtained using the superstructure described in claim 1 or 2.

Images