Artificial crown and manufacturing method thereof

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 in 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, accidents, or the like. 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 a preparation process and inserting an artificial dental crown into a damaged tooth. A tooth (Tim in FIG. 1(a)) damaged due to dental caries, an accident, or the like 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 process 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 treatment of the damaged tooth with the artificial dental crown (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 one hand, in such a method, there is a possibility of cracks or damage in the sintered body of the tooth, and the sintered body may be damaged by physical impacts generated during the sandblasting or coating process. As a result, the durability and lifespan of the dental crown are significantly reduced. In addition, due to the difference in the thermal expansion coefficients of the ceramic and the cement, the adhesive force of the bonding surface formed by sandblasting may gradually weaken. Consequently, the stability of the ceramic bonding interface formed by sandblasting can be reduced.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention has been made in view of the above problems, and an object thereof is to provide a formed artificial dental crown having treatment stability and a method for manufacturing the same by providing a mechanical bonding force in the process of bonding the inner surface of the formed artificial dental crown and cement.

Means for Solving the Problems

[0005] In order to achieve the above object, the artificial dental crown according to the present invention includes a formed body inserted and joined to a abutment tooth, in which a coupling groove into which the abutment tooth is inserted is formed, and a plurality of pattern portions formed by being inclined and drawn in at a certain depth on the inner surface of the formed body so as to accommodate an adhesive for joining the formed body to the abutment tooth. Each of the plurality of pattern portions can be formed by being drawn in at a depth in the range of 0.01 mm to 2 mm with respect to the inner surface of the coupling groove of the formed body. Further, 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 deeper than the depth of the labial pattern portion. In addition, in the method for manufacturing an artificial dental crown according to the present invention for achieving the above object, the molded body in which the joining groove into which the abutment tooth is inserted is formed is made of ceramics or a metal material, and in the injection step, the step of molding the molded body into a predetermined shape and the step of performing laser etching on the inner surface of the molded body to form the pattern portion can be included.

Effect of the Invention

[0006] In the artificial dental crown according to the present invention, since a plurality of pattern portions are formed on the inner surface of the molded body, the contact area can be enlarged in the process of bonding cement to the abutment tooth. Thereby, the mechanical bonding force between the abutment tooth and the artificial dental crown can be improved, and the treatment stability can be enhanced. Further, in the method for manufacturing an artificial dental crown according to the present invention, by forming a pattern portion through a laser etching process on a molded body molded by an injection method, a pattern of a small size within several millimeters can be precisely formed.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Best Mode for Carrying Out the Invention

[0008] Hereinafter, with reference to the accompanying drawings, an artificial dental crown and a method for manufacturing the same according to an embodiment of the present invention will be described in detail. In the drawings, for the sake of clarity of the present invention, parts not related to the description can be omitted, and throughout the specification, the same or similar components are denoted by the same reference numerals. FIG. 2 is a perspective view showing an artificial dental crown according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of FIG. 2. Referring to FIGS. 2 to 3, an artificial dental crown according to an embodiment of the present invention is inserted and joined to a prepared tooth (hereinafter referred to as a abutment tooth), and includes a molded body 10 and a plurality of pattern portions 20. The molded body 10 has the shape of a tooth after restoration. A coupling groove 10a is formed inside the molded body 10 so as to be inserted into an abutment tooth (see FIG. 1(b)). The molded body 10 can be made of a ceramic material or a metal material, and its outer shape and the coupling groove 10a can be manufactured by an injection process. The plurality of pattern portions 20 are formed by being recessed at a predetermined depth on the inner surface of the coupling groove 10a of the molded body 10, and can accommodate an adhesive for joining the molded body 10 to the abutment tooth. In this way, by providing the plurality of pattern parts 20, even if there is no change in the overall shape of the coupling groove 10a of the artificial dental crown, the pattern portion 20 is formed, and by increasing the bonding strength of the adhesive with respect to the pattern portion 20, the bonding strength between the abutment tooth and the artificial dental crown can be increased. The plurality of pattern portions 20 can be formed by a laser etching process. Further, each of the plurality of pattern portions 20 can be formed by being recessed at a depth in the range of 0.01 mm to 2 mm on the inner surface of the coupling groove 10a of the molded body 10. Here, when the depth of the recess of the pattern portion 20 is formed shallower than 0.01 mm, the bonding strength may be weakened. On the other hand, when it is formed to exceed 2 mm, cracks or appearance defects may occur in the molded body 10.

[0009] In addition, 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 joined to the labial side of the abutment tooth. The lingual pattern portion is formed on the inner surface of the coupling groove 10a joined to the lingual side of the abutment tooth. Here, the depth of the lingual pattern portion 25 can be formed relatively deeper than the depth of the labial pattern portion 21. This is a design considering that when the patient grinds the teeth after the artificial crown procedure, the force applied in the lingual direction to the teeth is greater than the force applied in the labial direction. That is, since the adhesive force of the lingual pattern portion 25 is relatively strong, when an external force in the lingual direction is applied to the molded body 10 after the procedure, the problem of the bonding force of the artificial crown becoming weak can be eliminated or minimized. Also, the shade and transmittance in the labial direction can be stabilized. That is, when the depth of the laser etching on the labial side is deep, it can cause defects in appearance such as a difference in shade and transmittance that penetrates in the labial direction. Here, the plurality of pattern portions 20 can be formed to be inclined so as to have a predetermined desired drawing-in angle by laser processing. The inclination angle can be adjusted by adjusting the angle between the molded body 10 and the laser etching equipment (50 in FIG. 6). Referring to FIG. 3, an example is shown in which the direction of the etching angle formed on the inner surface adhesion interface of the plurality of pattern portions 20 is formed close to the vertical direction with respect to the surface (adhesion interface) on which the pattern is formed. In this case, since the angle formed by the etching direction of the pattern portion 20 and the adhesion interface is close to vertical, the amount of the undercut cement formed based on the removal direction of the formed crown increases, and the adhesive force (mechanical bonding force) can increase. 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 the etching formation of the pattern portion is easy. 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 the cement becomes low, and the adhesiveness can be reduced. When the laser etching area is formed to be less than 0.1 in the labial direction or the lingual direction, respectively, the adhesive force is maintained only on the knitting side, and the stability of adhesion can be reduced. On the other hand, when the value of the laser etching area is formed within the range of the corresponding conditional expression, the adhesive forces in the labial direction and the lingual direction are maintained, and the stability of adhesion can be effectively enhanced. FIG. 5 is a flowchart showing the manufacturing process of the artificial dental crown according to the embodiment of the present invention, and FIG. 6 is a schematic partial cross-sectional view for explaining the laser equipment that performs the laser etching process of FIG. 5 for the artificial dental crown. Referring to FIGS. 5 to 6, in the method for manufacturing an artificial dental crown according to an embodiment of the present invention, it includes a step (S10) of injection molding a molded body 10, and a step (S30) of forming a plurality of pattern portions on the inner surface of the molded body 10 by laser etching. 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 formation process of 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, the inner surface of the coupling groove 10a on the lingual side is irradiated with a laser to form the lingual pattern portion 25 (S31). Next, after changing the direction of the probe 51 to the labial direction, while raising and lowering the probe 51, the inner surface of the coupling groove 10a on the labial side is irradiated with a laser 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 indentation of the pattern portion can be precisely processed according to desired specifications. In FIG. 6, the laser equipment 50 is 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 examples, and those having ordinary knowledge in the technical field to which the present invention pertains can also make various modifications and further create 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.

Explanation of 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 dental crowns, a molded body that is inserted and coupled to an abutment tooth and has a coupling groove formed therein to be inserted into the abutment tooth; and a plurality of pattern portions formed by pulling the molded body inwardly at a predetermined depth so as to accommodate a bonding agent for bonding the molded body to an abutment tooth.

2. 2. The artificial dental crown according to claim 1, wherein each of the plurality of pattern portions is formed by drawing into the inner surface of the coupling groove of the molded body to a depth in the range of 0.01 mm to 2 mm.

3. The plurality of pattern portions are a lingual pattern portion to be joined to the lingual side of the abutment tooth; a labial pattern portion that is bonded to the labial side of the abutment tooth; 3. The artificial dental crown according to claim 2, wherein the depth of the pattern part on the tongue side is relatively deeper than the depth of the pattern part on the lip side.

4. In the method for producing an artificial dental crown according to paragraph 1, The molded body is made of a ceramic or metal material, molding the molded body into a predetermined shape by an injection process; and forming the plurality of pattern portions on the inner surface of the molded body by laser etching.

5. 5. The method for manufacturing an artificial dental crown according to claim 4, wherein each of the plurality of pattern parts is formed by drawing into the inner surface of the coupling groove of the molded body to a depth ranging from 0.01 mm to 2 mm.

6. The plurality of pattern portions are a lingual pattern portion to be joined to the lingual side of the abutment tooth; a labial pattern portion that is bonded to the labial side of the abutment tooth; The method for manufacturing an artificial dental crown according to claim 5, wherein the depth of the pattern part on the tongue side is relatively deeper than the depth of the pattern part on the lip side.

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