Artificial tooth crown and method for manufacturing the same

Abstract

To disclose an artificial crown having a structure of providing a mechanical bonding force in a process of attaching cement to an inner surface, and a manufacturing method of the artificial crown.SOLUTION: An artificial crown according to the present invention includes: a molded body 10 inserted and attached to an abutment tooth and having a connection groove 10a to be inserted to the abutment tooth formed therein; and a plurality of pattern parts 20 formed so as to be inclined by a predetermined depth and drawn in an inner surface of the molded body so as to accommodate an adhesive for joining the molded body to the abutment tooth.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an artificial dental crown and a method for manufacturing the same, and more particularly, to an artificial dental crown having a structure capable of providing a mechanical bonding force during the process of bonding cement to the inner surface and a method for manufacturing the same.

Background Art

[0002] Generally, teeth may be damaged due to dental caries or accidents. Artificial teeth are used to restore and protect the functions of these damaged teeth. FIGS. 1(a) to 1(d) are diagrams showing the treatment steps of performing preparation on a damaged tooth and inserting an artificial dental crown. A tooth (Tim in FIG. 1(a)) damaged due to dental caries or an accident is prepared for a tooth (Tprep) (hereinafter referred to as a abutment tooth) to which an artificial dental crown is to be applied by performing a preparation step of cutting the damaged tooth as shown in FIG. 1(b). An artificial dental crown (Ac in FIG. 1(c)) is formed in a shape and size suitable for the abutment tooth and made of a biocompatible material such as metal or ceramic. As shown in FIG. 1(c), the artificial dental crown Ac is joined to the abutment tooth Tprep using an adhesive cement to complete the application of the artificial dental crown to the damaged tooth (see FIG. 1(d)). On the other hand, when the bond between the artificial dental crown and the adhesive cement is weak, a problem may occur that the artificial dental crown can be easily removed after the treatment. Such a problem not only causes psychological inconvenience to the patient but also reduces the treatment effect and causes a problem of retreatment. In a conventional method for increasing the bonding force between an artificial dental crown and an adhesive cement, a sandblasting method is applied to the inner surface of the formed dental crown to improve the adhesive force between the dental crown and the cement. This treatment method increases the adhesive force by causing fine variations on the surface of the sintered body and increasing the contact area with the cement. On the other hand, this method may cause cracks or breakage in the sintered tooth structure, and the physical impact generated during the sandblasting and coating process can damage the sintered structure. This can significantly reduce the durability and lifespan of the tooth crown. Furthermore, the difference in thermal expansion coefficients between ceramic and cement may cause the adhesive strength of the bonded surface to gradually weaken due to the sandblasting. As a result, the stability of the ceramic adhesive interface formed by sandblasting may decrease. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Korean Registered Patent No. 10-1964686B [Overview of the project] [Problems that the invention aims to solve]

[0004] This invention has been made in view of the above-mentioned problems, and aims to provide a molded artificial tooth crown with therapeutic stability and a method for manufacturing the same, by providing mechanical bonding force during the process of bonding the inner surface of the molded artificial tooth crown to the cement. [Means for solving the problem]

[0005] Furthermore, in order to achieve the above objective, the artificial tooth crown according to the present invention may include a molded body that is inserted into and joined to an abutment tooth and has a coupling groove into which the abutment tooth is inserted, and a plurality of patterned portions formed by drawing in at a certain depth into the inner surface of the molded body so as to accommodate an adhesive that joins the molded body to the abutment tooth. Each of the plurality of patterned portions can be drawn in to a depth in the range of 0.01 mm to 2 mm into the inner surface of the coupling groove of the molded body. Furthermore, the plurality of pattern portions include a lingual pattern portion joined to the lingual side of the abutment tooth and a labial pattern portion joined to the labial side of the abutment tooth, and the depth of the lingual pattern portion can be formed to be even deeper than the depth of the labial pattern portion. Furthermore, in the method for manufacturing an artificial tooth crown according to the present invention to achieve the above objective, the molded body having a joint groove into which an abutment tooth is inserted is made of a ceramic or metal material, and the method may include the steps of: molding the molded body into a predetermined shape by an injection process; and forming the pattern portion by laser etching on the inner surface of the molded body. [Effects of the Invention]

[0006] The artificial tooth crown according to the present invention has multiple patterned areas formed on the inner surface of the molded body, which allows for an increased contact area during the cement bonding process to the abutment tooth. This improves the mechanical bonding force between the abutment tooth and the artificial tooth crown, and enhances the stability of the treatment. Furthermore, in the method for manufacturing artificial tooth crowns according to the present invention, by forming a pattern portion on a molded body formed by injection molding through a laser etching process, it is possible to precisely form small patterns of a few millimeters or less. [Brief explanation of the drawing]

[0007] [Figure 1] This diagram illustrates the procedure for preparing a damaged tooth and inserting an artificial crown. [Figure 2] This is a perspective view showing an artificial tooth crown according to one embodiment of the present invention. [Figure 3] This is a cross-sectional view of Figure 2. [Figure 4] A cross-sectional view showing an artificial tooth crown according to another embodiment of the present invention. [Figure 5] This is a flowchart showing the manufacturing process of an artificial tooth crown according to an embodiment of the present invention. [Figure 6] This is a schematic partial cross-sectional view illustrating the laser equipment used to perform the laser etching process shown in Figure 5 on an artificial tooth crown. [Modes for carrying out the invention]

[0008] The following describes in detail, with reference to the attached drawings, an artificial tooth crown according to an embodiment of the present invention and a method for manufacturing the same. In the drawings, parts not relevant to the description are omitted for the sake of clarity of the present invention, and throughout the specification, identical or similar components are referred to by the same reference numerals. Figure 2 is a perspective view showing an artificial tooth crown according to one embodiment of the present invention, and Figure 3 is a cross-sectional view of Figure 2. Referring to Figures 2 and 3, an artificial tooth crown according to one embodiment of the present invention is inserted into and joined to a prepared tooth (hereinafter referred to as an abutment tooth) and includes a molded body 10 and a plurality of patterned parts 20. The molded body 10 has the shape of a restored tooth. The molded body 10 has a coupling groove 10a formed inside so that it can be inserted into an abutment tooth (see Figure 1(b)). The molded body 10 can be made of a ceramic material or a metal material, and its outer shape and coupling groove 10a can be manufactured by an injection molding process. The plurality of patterned parts 20 are drawn into the inner surface of the coupling groove 10a of the molded body 10 to a predetermined depth and can accommodate the bonding agent that joins the molded body 10 to the abutment tooth. In this way, by providing a plurality of patterned parts 20, the bonding strength between the abutment tooth and the artificial tooth crown can be increased by forming the patterned parts 20 and increasing the bonding strength of the bonding agent to the patterned parts 20, even without changing the overall shape of the coupling groove 10a of the artificial tooth crown. The plurality of pattern portions 20 can be formed by a laser etching process. Each of the plurality of pattern portions 20 can be formed by drawing into the inner surface of the bonding groove 10a of the molded body 10 to a depth in the range of 0.01 mm to 2 mm. If the depth of the drawing of the pattern portion 20 is shallower than 0.01 mm, the bonding strength may be weakened. On the other hand, if it is formed to a depth greater than 2 mm, cracks or defects in appearance may occur in the molded body 10.

[0009] Furthermore, the plurality of pattern portions 20 include a labial pattern portion 21 and a lingual pattern portion 25. The labial pattern portion 21 is formed on the inner surface of the coupling groove 10a that is joined to the labial side of the abutment tooth. The lingual pattern portion is formed on the inner surface of the coupling groove 10a that is joined to the lingual side of the abutment tooth. Here, the depth of the lingual pattern portion 25 can be formed to be relatively deeper than the depth of the labial pattern portion 21. This design takes into account that when a patient brushes their teeth after artificial crown placement, the force applied to the tooth in the lingual direction is greater than the force applied in the labial direction. In other words, because the adhesive force of the lingual pattern portion 25 is relatively strong, it is possible to eliminate or minimize the problem of weakened bonding force of the artificial crown when external force is applied to the molded body 10 in the lingual direction after placement. In addition, it is possible to stabilize the shade and transmittance in the labial direction. That is, if the laser etching depth on the labial side is deep, it can cause cosmetic defects such as differences in shade and transmittance that are visible in the labial direction. Here, the multiple pattern portions 20 can be formed at an angle by laser processing so as to have a predetermined desired indentation angle. The inclination angle can be adjusted by adjusting the angle between the molded body 10 and the laser etching equipment (50 in Figure 6). Referring to Figure 3, the multiple patterned portions 20 show an example where the direction of the etching angle formed at the inner adhesive interface is nearly perpendicular to the surface on which the pattern is formed (adhesive interface). In this case, since the angle between the etching direction of the patterned portion 20 and the adhesive interface is nearly perpendicular, the amount of undercut cement formed relative to the removal direction of the molded tooth crown increases, and the adhesive strength (mechanical bonding force) can be increased. FIG. 4 is a cross-sectional view showing an artificial dental crown according to another embodiment of the present invention. Among the plurality of pattern portions 20, the lingual pattern portion 25 is formed as an inclined surface toward the end of the opening of the coupling groove 10a. In this case, there is an advantage that it is easy to form the pattern portion by etching. On the other hand, the plurality of pattern portions 20 can also be formed to be inclined in the direction of the upper part of the coupling groove 10a (inclined in the direction opposite to the inclined direction in FIG. 4). Looking at the relationship between the laser etching area of the pattern portion 20, the stability of adhesion, and the total area of the adhesion interface, the following condition of Formula 1 can be satisfied.

Equation

[0010] In Formula 1, when the area of all laser etching is less than 0.2, the adhesion area with cement becomes low and the adhesiveness can decrease. When the laser etching area is formed to be less than iredirectionally or lingually, the adhesive force is only maintained on the iredirection and the stability of adhesion can decrease. On the other hand, when the value of the laser etching area is formed within the range of the corresponding conditional expression, the adhesive force in the labial direction and the lingual direction is maintained, and the stability of adhesion can be effectively enhanced. FIG. 5 is a flowchart showing the manufacturing process of an artificial dental crown according to an embodiment of the present invention, and FIG. 6 is a schematic partial cross-sectional view for explaining a laser device that performs the laser etching process of FIG. 5 for the artificial dental crown. Referring to FIGS. 5 to 6, in the manufacturing method of an artificial dental crown according to an embodiment of the present invention, it includes a step of injection molding a molded body 10 (S10) and a step of forming a plurality of pattern portions on the inner surface of the molded body 10 by laser etching (S30). Referring to step (S10), the molded body 10 is made of ceramics or a metal material and can be molded into an outer shape of a predetermined shape and a shape including a coupling groove by an injection process. Referring to the process of forming the plurality of pattern portions 20, laser etching can be performed while the probe 51 of the laser device 50 is inserted into the coupling groove 10a. At this time, while raising and lowering the probe 51, a laser is irradiated onto the inner surface of the coupling groove 10a on the lingual side to form the lingual pattern portion 25 (S31). Next, after changing the direction of the probe 51 to the labial side direction, while raising and lowering the probe 51, a laser is irradiated onto the inner surface of the coupling groove 10a on the labial side to form the labial pattern portion 21 (S35). Here, S31 and S35 may be processed by changing the procedure.

[0011] As described above, by providing a plurality of pattern portions through the laser etching process, the depth and angle of the recess of the pattern portion can be precisely processed according to the desired specifications. In FIG. 6, the laser equipment 50 has been described as including the probe 51, but it is not limited thereto. That is, the laser equipment 500 can also directly irradiate laser light without the probe 51. The above embodiments are merely illustrative, and those having ordinary knowledge in the technical field to which the present invention pertains can also make various modifications and further other embodiments therefrom . Therefore, the true scope of the technical protection of the present invention must be determined by the technical idea of the invention described in the claims.

Description of the reference numerals

[0012] 10 Molded body 10a Coupling groove 20 Pattern portion 21 Labial pattern portion 25 Lingual pattern portion 50 Laser equipment 51 Probe

Claims

1. In artificial tooth crowns, A molded body having a coupling groove formed therein, which is inserted into and coupled to the abutment tooth, An artificial tooth crown comprising a plurality of patterned portions formed by a laser etching process, which are drawn in at a predetermined depth and tilted to accommodate an adhesive for joining the molded body to the abutment tooth, wherein the relationship between the laser etching area of ​​the patterned portions and the area of ​​the adhesive interface satisfies the following [Equation 1]. 【Number 1】 Here, A (Labial + Lingual) represents the sum of the laser etching areas of the labial pattern and the lingual pattern, A Labial represents the laser etching area of ​​the labial pattern, A Lingual represents the laser etching area of ​​the lingual pattern, and A all represents the total area of ​​the adhesive interface within the bonding groove.

2. The artificial tooth crown according to claim 1, characterized in that the plurality of patterned portions are formed as recesses on the inner surface of the bonding groove of the molded body, and their depth is 0.01 mm or more and 2 mm or less.

3. The aforementioned multiple pattern sections are, The lingual pattern portion is joined to the lingual side of the abutment tooth, The abutment tooth includes a labial pattern portion that is joined to the labial side of the abutment tooth, The artificial tooth crown according to claim 2, characterized in that the depth of the lingual pattern portion is greater than the depth of the labial pattern portion.

4. A method for manufacturing an artificial tooth crown according to any one of Claims 1 to 3, The steps include: molding the aforementioned molded body into a predetermined shape by an injection process; A method for manufacturing an artificial tooth crown, comprising the steps of: performing laser etching on the inner surface of the molded body while inserting the probe of the laser device into the coupling groove and raising and lowering it to form the plurality of pattern portions; and controlling the angle between the molded body and the laser device during the laser etching so that an inclination angle is formed so that the etching direction of the pattern portions is substantially perpendicular to the adhesive interface.

5. The method for manufacturing an artificial tooth crown according to claim 4, characterized in that the plurality of pattern portions are formed as recesses on the inner surface of the bonding groove of the molded body, and their depth is 0.01 mm or more and 2 mm or less.

6. The aforementioned multiple pattern sections are, The lingual pattern portion is joined to the lingual side of the abutment tooth, The abutment tooth includes a labial pattern portion that is joined to the labial side of the abutment tooth, The method for manufacturing an artificial tooth crown according to claim 5, characterized in that the depth of the lingual pattern portion is greater than the depth of the labial pattern portion.

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