Artificial dental crown and manufacturing method thereof

Abstract

Disclosed are an artificial dental crown and a method for manufacturing the same, which can provide a mechanical bonding force in the process of bonding an adhesive to an inner face. The disclosed artificial dental crown may comprise: a molded body which is inserted into and engaged with a prepared tooth and in which a coupling groove into which the prepared tooth is inserted is formed; and a plurality of pattern parts which are introduced and formed on the inner surface of the molded body at a certain depth in an inclined manner so as to be capable of accommodating an adhesive for bonding the molded body to the prepared teeth.

Description

Technical Field

[0001] The present invention relates to an artificial tooth crown and a manufacturing method thereof, and more particularly to an artificial tooth crown and a manufacturing method thereof, which can provide mechanical bonding force during the process of bonding an adhesive to an inner surface. Background Art

[0002] Often, teeth are damaged due to caries or accidents etc. Artificial teeth are used to restore and preserve the functions of these damaged teeth.

[0003] Figure 1 (a) to Figure 1 (d) is a diagram showing the surgical process of preparing a damaged tooth and inserting an artificial crown.

[0004] like Figure 1 As shown in (b), by treating teeth damaged by caries or accidents ( Figure 1 (a) Tim) performs a preparation process of cutting and grinding damaged teeth to prepare the teeth for artificial crown surgery (Tprep).

[0005] Artificial crown( Figure 1 (c) Ac) is formed in the shape and size suitable for the prepared tooth and is made of biocompatible materials such as metal or ceramic. Figure 1 As shown in (c), the artificial crown (Ac) is bonded to the prepared tooth (Tprep) using an adhesive, thereby completing the artificial crown surgery on the damaged tooth (refer to Figure 1 (d)).

[0006] On the other hand, when the bonding force between the artificial crown and the adhesive is weak, the artificial crown may often fall off after surgery. This problem not only causes psychological discomfort to the patient, but also reduces the treatment effect and causes the need for re-treatment.

[0007] As an existing surgical method for improving the adhesion between an artificial crown and an adhesive, a method of improving the adhesion between the crown and the adhesive by sandblasting the inner surface of a formed crown is disclosed. The surgical method can increase the contact area with the adhesive by generating minute irregularities on the surface of a sintered body, thereby improving the adhesion.

[0008] On the other hand, this surgical method may cause cracking or damage to the tooth sintered body, and the physical impact generated during the sandblasting or coating process may damage the sintered body. Therefore, the durability or life of the crown may be greatly reduced. In addition, due to the difference in thermal expansion coefficients of ceramics and adhesives, the bonding force of the bonding surface produced by sandblasting is likely to gradually weaken. Therefore, the stability of the ceramic bonding interface formed by sandblasting may be reduced.

[0009]

Prior technical literature

[0010] [Patent Literature]

[0011] Korean registered patent gazette 10-1964686B (publication date: 2019.04.02.) Summary of the invention

[0012] The present invention has been created in consideration of the above-mentioned problems, and its purpose is to provide a molded artificial crown with therapeutic stability and a method for manufacturing the same by providing a mechanical bonding force in the process of bonding the inner surface of the molded artificial crown to an adhesive.

[0013] In order to achieve the above-mentioned object, the artificial crown according to the present invention may include: a molded body, which is inserted and bonded to the prepared tooth and is formed with a bonding groove for inserting the prepared tooth; and a plurality of pattern parts, which are obliquely introduced into the inner surface of the molded body at a certain depth so as to accommodate a bonding agent for bonding the molded body to the prepared tooth. The plurality of pattern parts may be respectively introduced into the inner surface of the bonding groove formed in the molded body at a depth ranging from 0.01 mm to 2 mm.

[0014] In addition, the plurality of pattern portions include: a lingual pattern portion joined to the lingual side of the prepared tooth; and a labial pattern portion joined to the labial side of the prepared tooth, and the depth of the lingual pattern portion can be formed to be relatively deeper than the depth of the labial pattern portion.

[0015] In addition, in order to achieve the above-mentioned purpose, the manufacturing method of the artificial crown according to the present invention may include the following steps: a molded body having a coupling groove for inserting the prepared tooth is made of a ceramic or metal material, and the molded body is molded into a specified shape by an injection molding process; a pattern portion is formed on the inner surface of the molded body by laser etching.

[0016] The artificial crown according to the present invention has a plurality of pattern parts formed on the inner surface of the molded body, so that the contact area can be enlarged during the bonding of the adhesive to the prepared tooth. Therefore, since the mechanical bonding force between the prepared tooth and the artificial crown can be improved, the treatment stability can be improved.

[0017] In addition, the method for manufacturing an artificial dental crown according to the present invention has the advantage that a pattern portion is formed by a laser etching process on a molded body molded by an injection molding process, so a small-sized pattern within several millimeters can be precisely formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 (a) to Figure 1 (d) is a diagram showing the surgical process of preparing a damaged tooth and inserting an artificial crown.

[0019] Figure 2 is a perspective view showing an artificial dental crown according to one embodiment of the present invention.

[0020] Figure 3 yes Figure 2 Cross-sectional view of .

[0021] Figure 4 is a cross-sectional view showing an artificial dental crown according to another embodiment of the present invention.

[0022] Figure 5 1 is a sequence diagram showing a process of manufacturing an artificial dental crown according to an embodiment of the present invention.

[0023] Figure 6 It is used to describe the Figure 5 Schematic partial cross-sectional view of a laser equipment for a laser etching process.

[0024] Description of symbols

[0025] 10: Molded body 10a: Bonding groove

[0026] 20: Pattern Department

[0027] 21: Labial pattern 25: Tongue pattern

[0028] 50: Laser equipment 51: Probe DETAILED DESCRIPTION

[0029] Hereinafter, an artificial crown and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the accompanying drawings, in order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are used for the same or similar components throughout the specification.

[0030] Figure 2 is a perspective view showing an artificial crown according to an embodiment of the present invention, Figure 3 yes Figure 2 Cross-sectional view of .

[0031] Reference Figure 2 and Figure 3According to an embodiment of the present invention, an artificial crown is inserted and joined to a prepared tooth, and may include a molded body 10 and a plurality of pattern parts 20. The molded body 10 has a restored tooth shape. The molded body 10 has a coupling groove 10a formed therein so as to be inserted into the prepared tooth (refer to Figure 1 (b)). The molded body 10 can be made of ceramic or metal material, and its outer shape and the coupling groove 10a can be manufactured by an injection molding process. A plurality of pattern portions 20 are introduced into the inner surface of the coupling groove 10a formed in the molded body 10 at a specified depth, and can accommodate a bonding agent for bonding the molded body 10 to the prepared tooth. As described above, by providing a plurality of pattern portions 20, even if the overall shape of the coupling groove 10a of the artificial crown is not changed, the bonding force of the bonding agent to the pattern portion 20 can be increased by forming the pattern portion 20, thereby increasing the bonding strength between the prepared tooth and the artificial crown.

[0032] The plurality of pattern parts 20 may be formed by a laser etching process. In addition, the plurality of pattern parts 20 may be introduced into the inner surface of the coupling groove 10a formed in the molded body 10 at a depth ranging from 0.01 mm to 2 mm. Here, when the introduction depth of the pattern part 20 is formed shallower than 0.01 mm, the coupling strength may be weakened. On the contrary, if it is formed to exceed 2 mm, the molded body 10 may have cracks or appearance defects.

[0033] In addition, the plurality of pattern portions 20 may 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 bonded to the labial side of the prepared tooth. The lingual pattern portion 25 is formed on the inner surface of the coupling groove 10a that is bonded to the lingual side of the prepared tooth. Here, the depth of the lingual pattern portion 25 may be formed to be relatively deeper than the depth of the labial pattern portion 21.

[0034] This is designed in consideration of the fact that when the patient brushes his teeth after the artificial crown surgery, the force applied to the teeth in the lingual direction is greater than the force applied in the labial direction. In other words, since the bonding force of the lingual pattern portion 25 is relatively strong, the problem of weakened bonding force of the artificial crown when external force is applied to the lingual direction of the molded body 10 after surgery can be solved or minimized. In addition, the shadow and transmittance in the labial direction can be stabilized. In other words, when the laser etching depth of the labial side is deep, appearance defects such as differences in shadow and transmittance reflected in the labial direction may occur.

[0035] Here, the plurality of pattern parts 20 may be formed obliquely in a form having a prescribed desired lead-in angle by laser processing. Figure 6 50) so that its inclination angle can be adjusted.

[0036] Figure 3This is an example in which the direction of the etching angle formed at the bonding interface of the inner surface of the plurality of pattern parts 20 is formed close to the vertical direction relative to the surface (bonding interface) formed with the pattern. In this case, since the etching direction of the pattern part 20 and the angle formed by the bonding interface are close to vertical, the amount of undercut cement formed based on the removal direction of the molded crown increases, and the bonding force (mechanical bonding force) increases.

[0037] Figure 4 2 is a cross-sectional view of an artificial crown according to another embodiment of the present invention, wherein the lingual pattern portion 25 of the plurality of pattern portions 20 may be formed to be inclined toward the opening end of the coupling groove 10a. In this case, it is advantageous in that etching of the pattern portion 20 is easily performed. On the other hand, the plurality of pattern portions 20 may also be formed to be inclined toward the upper portion of the coupling groove 10a (towards the upper portion relative to the coupling groove 10a). Figure 4 Tilt in the opposite direction of the tilt direction).

[0038] When the relationship between the laser etching area of ​​the pattern part 20 and the adhesion stability and the total area of ​​the adhesion interface is observed, the condition of the following Mathematical Formula 1 may be satisfied.

[0039] <Mathematical formula 1>

[0040]

[0041] Here, A1 represents the total area of ​​the bonding interface where the pattern portion is not formed on the inner surface of the bonding groove of the molded body, and A Labial The area of ​​the laser-etched pattern representing the lip side pattern portion 21, A Lingual The area of ​​the laser-etched pattern representing the tongue-side pattern portion 25, A all Represents the total bonding interface area inside the bonding groove.

[0042] In Mathematical Formula 1, when the entire laser etching area is less than 0.2, the bonding area with the adhesive is small, and the bonding force may be reduced. When the laser etching area is less than 0.1 in the labial direction or the lingual direction, respectively, the bonding force is only maintained on one side, and the bonding stability may be reduced. On the contrary, when the laser etching area value is formed within the range of the corresponding conditional formula, the bonding force in the labial and lingual directions can be maintained, effectively increasing the bonding stability.

[0043] Figure 5 is a sequence diagram showing a process for manufacturing an artificial crown according to an embodiment of the present invention, Figure 6 It is used to describe the Figure 5 Schematic partial cross-sectional view of a laser equipment for a laser etching process.

[0044] Reference Figure 5 and Figure 6The method for manufacturing an artificial dental crown according to an embodiment of the present invention may include the following steps: performing injection molding on a molded body 10 S10 ; and forming a plurality of pattern parts by laser etching the inner surface of the molded body 10 S30 .

[0045] From step S10 , the molded body 10 is made of ceramic or metal material, and can be molded into a shape including a prescribed shape of an outer shape and a coupling groove by an injection molding process.

[0046] By observing the formation process of multiple pattern parts 20 in detail, laser etching can be performed while the probe 51 of the laser equipment 50 is inserted into the coupling groove 10a. At this time, the inner surface of the coupling groove 10a on the tongue side is irradiated with laser while the probe 51 is raised and lowered, thereby forming the tongue side pattern part 25S31. Then, after changing the direction of the probe 51 to the labial direction, the inner surface of the labial coupling groove 10a is irradiated with laser while the probe 51 is raised and lowered, thereby forming the labial side pattern part 21S35. Here, step S31 and step S35 can also be processed by changing their order.

[0047] As described above, by providing a plurality of pattern parts through the laser etching process, the introduction depth and angle of the pattern parts can be accurately processed according to the desired specifications. Figure 6 The laser equipment 50 includes the probe 51 as an example, but the invention is not limited thereto. In other words, the laser equipment 500 can directly irradiate the laser without the probe 51.

[0048] The above embodiments are merely exemplary, and a person with general knowledge in the technical field to which the present invention belongs may implement various modifications and equivalent other embodiments accordingly. Therefore, the true technical protection scope of the present invention must be determined by the technical idea of ​​the invention recorded in the claims.

Claims

1. An artificial crown, characterized in that: include: a molded body which is inserted into and coupled to the prepared tooth and is formed with a coupling groove for inserting the prepared tooth; A plurality of pattern portions are formed obliquely and introduced into the inner surface of the molded body at a certain depth so as to accommodate a bonding agent for bonding the molded body to the prepared tooth.

2. The artificial crown according to claim 1, characterized in that: A plurality of pattern portions are introduced into the inner surface of the coupling groove of the molded body at a depth ranging from 0.01 mm to 2 mm.

3. The artificial crown according to claim 2, characterized in that: The multiple pattern parts include: a lingual pattern portion that is joined to the lingual side of the prepared tooth; The labial pattern part is joined to the labial side of the prepared tooth, The depth of the tongue-side pattern portion is formed relatively deeper than the depth of the labial-side pattern portion.

4. A method for manufacturing an artificial dental crown, as a method for manufacturing the artificial dental crown according to claim 1, characterized in that: The steps include: The molded body is made of ceramic or metal material, and is molded into a specified shape through an injection molding process; A plurality of pattern portions are formed on the inner surface of the molded body by laser etching.

5. The method for manufacturing an artificial crown according to claim 4, characterized in that: A plurality of pattern portions are introduced into the inner surface of the coupling groove of the molded body at a depth ranging from 0.01 mm to 2 mm.

6. The method for manufacturing an artificial crown according to claim 5, characterized in that: The multiple pattern parts include: a lingual pattern portion that is joined to the lingual side of the prepared tooth; The labial pattern part is joined to the labial side of the prepared tooth, The depth of the tongue-side pattern portion is formed relatively deeper than the depth of the labial-side pattern portion.

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