KR100775579B1 - Dental implants containing zirconia - Google Patents

Abstract

The present invention is a dental implant comprising a fixture buried in the alveolar bone of the site where the tooth is lost, and an abutment to which the artificial dental crown is fixedly coupled, wherein the fixture is formed in a tapered shape toward the lower end direction, The screw thread formed on the outer circumferential surface of the fixture and the round-shaped rounded part concave toward the lower end of the fixture at the distal end of the screw thread further include a screw part, and is made of a material including a zirconia-alumina composite, and an outer surface thereof. Relates to a dental implant comprising zirconia, which is coated with an apatite compound.

Dental implant comprising a zirconia according to the present invention is to be provided with a screw portion having a round portion in the fixture to be bone-bonded to the alveolar bone, so that the material of the fixture includes zirconia and apatite-based compounds, the fixture is bone in the alveolar bone The adhesion is made smoothly, there is an effect that can be used without long-term shaking.

Description

Dental Implants Containing Zirconia {Dental Implant}

1 is a cross-sectional view showing a conventional implant.

Figure 2 is a perspective view of a dental implant comprising zirconia according to a first embodiment of the present invention.

3 is a cross-sectional view showing a dental implant comprising zirconia according to a first embodiment of the present invention.

Figure 4 is a front view showing a dental implant comprising zirconia according to a second preferred embodiment of the present invention.

5 is a cross-sectional view showing a dental implant comprising zirconia according to a second preferred embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: Fixture 11: Fixture

12: thread 12a: thread

12b: Round 14: Long groove

16: abutment coupling part 18: insertion hole

20: abutment 30: screw

40: abutment

The present invention relates to a dental implant containing zirconia, and more particularly, to increase the width of the screw portion to be bonded to the alveolar bone as much as possible to facilitate the bone adhesion, zirconia to use artificial teeth without long-term shaking It relates to a dental implant comprising a.

In general, implants are used for artificial dental procedures used to cope with lost teeth. Unlike conventional prosthetics or dentures, implants do not damage the surrounding dental tissue, and their function or shape is similar to that of natural teeth. It has a long lifespan and is a high-tech procedure that is currently in the spotlight.

Such an implant is a fixture that is embedded in the alveolar bone where the tooth is lost, an abutment coupled to the upper side of the fixture, and is fixed in the oral cavity by the abutment to have the same shape as a natural tooth. And artificial crown (Crown) to reproduce the function, such a conventional implant is shown in FIG.

Referring to FIG. 1, a conventional implant 100 includes a fixture 110, an abutment 120, and a screw 130.

Fixture 110 is inserted into the alveolar bone thread 112 is formed to be perpendicular to the longitudinal direction to be screwed. In addition, an abutment coupling part 114 is formed on the fixture 110.

The abutment 120 is positioned at the bottom and inserted into the abutment coupling portion 114 of the fixture 110, the inside is formed in a hollow so that the artificial crown (not shown) is inserted, fixed.

The screw 130 is fastened to the fixture 110 through the abutment 120, and the screw 130 penetrates the lower end of the abutment 120 and is inserted into the upper end of the fixture 110. In this case, the abutment 120 is fixed to the fixture 110.

When the fixture 110 of the implant 100 configured as described above elapses in a state in which the alveolar bone is implanted, bone adhesion progresses while the osteoblast cells of the alveolar bone adhere to the thread 112, and thus the alveolar bone It will be fixed.

However, the size of the alveolar bone is limited, and the size of the thread 112 that is bone-bonded with the alveolar bone is also limited, if the continuous repeated load is applied in the mouth, that is, the process of chewing food using teeth If repeated, a fine vibration is generated in the process to cause a problem in the bone adhesion between the fixture 110 and the alveolar bone, there was a problem that must be re-treated the implant.

On the other hand, since the fixture 110 is directly implanted into the alveolar bone, there should be no rejection reaction to the living body, and strength and properties should be maintained in vivo after the implantation.

Accordingly, the material of the fixture 110 is titanium, which has a suitable mechanical strength and biocompatibility, excellent corrosion resistance and excellent osteoadhesion ability, is most widely used as a dental implant. However, titanium has a problem that it takes a long time before bone adhesion occurs.

Alumina, hydroxyapatite (HA), and zirconia ceramics have been studied for a long time as a substitute material for titanium.

Alumina has been successfully bonded to the alveolar bone, but it is currently not used well because of its low strength to endure long-term loads.

Hydroxyapatite is a kind of calcium phosphate, which has very similar crystallographic and chemical properties to bones, teeth, etc. of the human body, so that it does not cause harmful reactions with biological tissues and also naturally binds to biological tissues by absorption after time.

However, hydroxyapatite has a disadvantage in that mechanical properties such as mechanical strength and fracture toughness are not good, and thus it is not suitable as a material for living hard tissue such as artificial teeth, which requires high mechanical strength or fracture toughness.

Zirconia is a bioinert material that does not cause toxic reactions when inserted into the human body, and has been studied as an implant material because of its excellent resistance to corrosion and abrasion and high flexural strength and fracture toughness. In addition, since it has a color similar to natural teeth, it can be usefully used for aesthetic restoration.

However, if the zirconia fixture is buried in the alveolar bone and the cyclic load is continuously applied in the oral cavity, a slight vibration occurs in the fixture, resulting in a problem of bone adhesion between the fixture and the alveolar bone, and the fixture in the alveolar bone It is often caused by shaking, which causes the implant to lose function.

Therefore, there is a demand for a technique of inducing bone adhesion between a zirconia fixture and an alveolar bone.

In order to solve the problems of the prior art as described above, an object of the present invention is to increase the width of the screw thread to be bonded to the alveolar bone as much as possible to facilitate the bone adhesion, including zirconia to use artificial teeth without long-term shaking It is to provide a dental implant.

In addition, another object of the present invention is to provide a dental implant comprising zirconia, which allows the fixture to be smoothly bonded to the alveolar bone by using a fixture comprising a zirconia and an apatite compound.

In order to achieve the above object, the present invention is a dental implant comprising a fixture implanted in the alveolar bone of the site where the tooth is lost, and in the dental implant comprising an abutment to which the artificial crown is fixedly fixed, the fixture is lowered toward the lower end direction A material comprising a zirconia-alumina composite, which is formed in a tapered shape and has a thread formed on an outer circumferential surface of the fixture and a round shaped rounded portion concave from the distal end of the screw toward the lower end of the fixture. The outer surface is provided with a dental implant comprising a zirconia, characterized in that the coating with an apatite-based compound.

The present invention also provides a dental implant comprising zirconia, characterized in that the long groove is formed in the longitudinal direction of the fixture on one side of the screw portion.

In addition, the apatite compound in the present invention provides a dental implant comprising zirconia, characterized in that consisting of hydroxyapatite or fluoroapatite.

In addition, in the present invention, the outer surface of the fixture is coated with the fluoroapatite and then coated with the hydroxyapatite provides a dental implant comprising zirconia.

In addition, the present invention is a dental implant embedded in the alveolar bone of the site where the tooth is lost, the dental implant of claim 1; And an abutment having a coupling portion positioned and coupled to an upper end of the fixture and a body portion extending vertically from the coupling portion, the upper portion of the fixture having an artificial crown positioned thereon. It provides a dental implant comprising a.

In addition, the present invention is a dental implant embedded in the alveolar bone of the site where the tooth is lost, the dental implant of claim 1; And an abutment body formed integrally extending from the upper portion of the fixture to be positioned on the gum of the portion where the tooth is lost, and a crown coupling portion formed integrally extending from the upper portion of the abutment body to position the artificial crown. It provides a dental implant comprising zirconia characterized in that the branch comprises an abutment.

Hereinafter, with reference to the accompanying drawings will be described in more detail a dental implant comprising a zirconia according to a preferred embodiment of the present invention.

2 is a perspective view showing a dental implant comprising a zirconia according to a first preferred embodiment of the present invention, Figure 3 is a cross-sectional view showing a dental implant comprising a zirconia according to a first preferred embodiment of the present invention to be.

2 and 3, the dental implant comprising zirconia according to the first preferred embodiment of the present invention is a fixture 10, artificial crown (not shown) is embedded in the alveolar bone of the site where the tooth is missing It is configured to include an abutment 20 and a screw 30 to be coupled.

The fixture 10 is embedded in the alveolar bone where the tooth is lost to support the artificial crown, has a predetermined length, and is formed in a tapered shape toward the lower portion.

In addition, a threaded portion 12 having a threaded portion 12a and a rounded portion 12b is formed on an outer circumferential surface of the fixture 10.

The thread 12a is formed while surrounding the outer circumferential surface of the fixture 10 so that the fixture 10 is screwed into the alveolar bone and embedded.

The round part 12b is to allow the thread 12a to be more easily embedded in the alveolar bone, and is formed in a round shape concave toward the lower end of the fixture 10 at the tip of the thread 12a. Since the width of the screw portion 12 that is bone-bonded to the alveolar bone is increased as much as the rounded portion 12b, after the fixture 10 is embedded in the alveolar bone, the bone adhesion is configured to be made more smoothly.

In addition, one side of the screw portion 12 of the fixture 10 is formed with a long elongated groove 14 in the longitudinal direction of the fixture 10, when the fixture 10 is screwed to the alveolar bone to be embedded, The blood flows easily to the outside, alveolar bone to reduce the bone stress to some extent, and to facilitate the screw coupling.

And the material of the fixture 10 is configured to include a zirconia-alumina that is excellent in biocompatibility, yet robust.

Zirconia is a bioinert material that does not cause toxic reactions when inserted into the human body, and has excellent resistance to corrosion and abrasion and has high flexural strength and fracture toughness. In addition, since it has a color similar to natural teeth, it can be usefully used for aesthetic restoration.

Alumina is weak in strength but has the advantage of successful bone adhesion with alveolar bone.

Therefore, the fixture 10 of the present invention is made of zirconia-alumina composite powder mixed with strong zirconia powder and alumina powder having good bone adhesion with alveolar bone.

In order for the fixture 10 including such zirconia-alumina to improve bone fusion with the alveolar bone, it is preferable to coat materials having various bioactivity on the outer surface of the fixture 10, and the present invention. In the Apatite compound is coated on the outer surface of the fixture 10 including zirconia-alumina, so that the fixture 10 is naturally bonded to the alveolar bone.

Apatite-based compounds include hydroxyapatite, carbonateapatite, fluoroapatite, oxiapatite, fluorohydroxyapatite, Sr-doped hydroxyapatite, Sr-doped carbonateapatite, Sr-doped fluoroapatite, Sr-doped oxyapatite , Sr-doped fluorohydroxyapatite, Mg-doped hydroxyapatite, Mg-doped carbonate apatite, Mg-doped fluoroapatite, Mg-doped oxiapatite, Mg-doped fluorohydroxyapatite, Si- Doped hydroxyapatite, Si-doped carbonate apatite, Si-doped fluoroapatite, Si-doped oxiapatite, Si-doped fluorohydroxyapatite, mixtures thereof or can be converted into apatite by sintering process, etc. Materials, ie, apatite precursors Among them, one of the things that facilitates bone fusion because of its good affinity with bone is hydroxyapatite, a kind of calcium phosphate, which has very similar crystallographic or chemical properties to bones, teeth, etc. of the human body. Therefore, it does not cause harmful reactions with biological tissues, and also naturally binds to biological tissues by absorption after time.

However, when the hydroxyapatite is directly coated on the surface of the zirconia, the hydroxyapatite is collapsed due to the chemical reaction between the hydroxyapatite and the zirconia, and the mechanical properties of the zirconia are reduced. Fluorine apatite having excellent stability is used as an intermediate layer and inserted between zirconia and hydroxyapatite.

That is, after forming a fluorite apatite on the outer surface of the fixture 10 first, a hydroxyapatite is formed later.

The manufactured fixture 10 has a high degree of bone fusion, and when time passes while the fixture 10 is embedded in the alveolar bone of the operator, the osteoblast cells of the alveolar bone stick to the screw portion 12 while Adhesion proceeds, and thus, the partial gap between the alveolar bone and the threaded portion 12 and the long groove 14 are filled, so that the fixture 10 is firmly fixed to the alveolar bone.

The abutment 20 is positioned at the bottom and inserted into the abutment coupling portion 16 of the fixture 10, and the inside of the abutment 20 is formed in a hollow so that the artificial crown (not shown) is inserted and fixed.

The screw 30 is to allow the abutment 20 to be fixed to the fixture 10. The screw 30 is inserted through the lower end of the abutment 20 and formed at the upper end of the fixture 10. By inserting and fastening to the ball 18, the abutment 20 is fixed to the fixture 10.

The implant is configured such that the fixture 10 is completely fixed to the alveolar bone like the root of natural teeth, and then the abutment 20 is placed on the abutment coupling part 16 of the fixture 10. In the state, the abutment 20 is fixed to the upper portion of the fixture 10 through the screw 30, and the artificial dental crown (not shown) is seated and bonded to the upper end of the abutment 20, Complete the implant procedure.

Figure 4 is a front view showing a dental implant comprising a zirconia according to a second preferred embodiment of the present invention, Figure 5 is a cross-sectional view showing a dental implant comprising a zirconia according to a second preferred embodiment of the present invention to be.

4 and 5, the dental implant including zirconia embedded in the alveolar bone of the site where the tooth is lost according to the second preferred embodiment of the present invention is the fixture 10 of the first embodiment (shown in FIG. 2). And the abutment 40 and the abutment 40 formed integrally without the abutment coupling portion 16 (shown in FIG. 2) and the insertion hole 18 (shown in FIG. 2).

That is, the fixture 11 includes a threaded portion 12 and a groove portion 14 having a threaded portion 12a and a rounded portion 12b, and the material includes a zirconia-alumina and an apatite-based compound.

The abutment 40 is to allow the artificial crown to be positioned and fixed at the top of the fixture 11, and includes an abutment body 42 and a crown coupling portion 44.

The abutment body 42 is integrally formed at the upper portion of the fixture 11 when the fixture 11 is embedded in the alveolar bone of the portion where the tooth is lost, so that the tooth is located on the gum of the portion where the tooth is lost. It is composed. Since the abutment body 42 does not need to be fixed to the fixture 11 separately, the path from which the abutment body 42 deviates from the fixture 11 is original even if the repeated load is continuously applied in the oral cavity. It is blocked, and the implant procedure time is significantly shortened, which can give satisfaction to both the operator and the subject.

The abutment body 42 is formed in a cylindrical shape, and the diameter of one end surface horizontally positioned with the upper portion of the fixture 11 is formed to correspond to the size of the portion where the tooth is lost.

In addition, the length of the abutment body 42 extending from the fixture 11 is configured to correspond to the gum of the portion where the tooth is lost.

As such, the abutment body 42 may be formed to be selected to fit the site of the patient's teeth lost and the gums, it is possible to increase the completeness of the operator and the satisfaction of the subject.

The crown coupling portion 44 is formed integrally extending from the upper portion of the abutment body 42 and the artificial crown is positioned, and the length of the crown coupling portion 44 is inserted into the crown coupling portion 44. It is formed to correspond to.

In addition, the crown coupling portion 44 further includes one or more coupling grooves 44a formed to have a predetermined width and depth along the longitudinal direction from the upper end portion thereof.

Thus, when the fixture 11 is screwed to the alveolar bone and embedded, the operator uses a pivot member (not shown) having a coupling protrusion (not shown) corresponding to the coupling groove 44a. ) Is easily rotated and embedded in the alveolar bone.

In addition, the artificial dental crown may be formed so that the coupling protrusion (not shown) corresponding to the coupling groove 44a is formed so that the artificial dental crown does not move from side to side.

As described so far, the dental implant comprising the zirconia of the present invention is such that the fixture bonded to the alveolar bone is formed in a tapered shape, and the material of the fixture includes zirconia and apatite-based compounds, Chew makes bone adhesion to the alveolar bone smoothly, there is an advantage that the implant can be used without long-term shaking.

While the invention has been described in detail in the foregoing embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

As described above, the dental implant comprising a zirconia according to the present invention is provided with a screw having a round portion in the fixture to be bone-bonded to the alveolar bone, so that the bone adhesion is made smoothly, artificial teeth without long-term shaking This has the effect of making it available.

In addition, the dental implant comprising zirconia according to the present invention is to use a fixture containing a zirconia and apatite-based compound, there is an effect that the fixture smoothly makes bone adhesion to the alveolar bone.

Claims (6)

In the dental implant comprising a fixture buried in the alveolar bone of the site where the tooth is lost, and an abutment to which the artificial crown is fixedly coupled, The fixture is formed in a tapered shape toward the lower end, and further includes a thread formed on the outer circumferential surface of the fixture and a thread having a round-shaped rounded part concave toward the lower end of the fixture at the distal end of the screw. And a zirconia-alumina composite, the outer surface of which is coated with an apatite-based compound, the dental implant comprising zirconia. The method of claim 1, Dental implant comprising zirconia characterized in that the long groove is formed in the longitudinal direction of the fixture on one side of the screw portion. The method of claim 1, The apatite compound is a dental implant comprising zirconia, characterized in that consisting of hydroxyapatite or fluoroapatite. The method of claim 3, wherein An outer surface of the fixture is coated with the fluoroapatite, and then coated with the hydroxyapatite, the dental implant comprising zirconia. In the dental implant is embedded in the alveolar bone of the site where the tooth is missing, The fixture of claim 1; And An abutment having a coupling portion positioned and coupled to an upper end of the fixture, a body portion extending vertically from the coupling portion, and an artificial crown positioned at an upper portion thereof; Dental implants comprising zirconia, characterized in that comprising a. In the dental implant is embedded in the alveolar bone of the site where the tooth is missing, The fixture of claim 1; And Has an abutment body formed integrally extending from the upper portion of the fixture to be located on the gum of the site where the tooth is lost, and a crown coupling portion formed integrally extending from the upper portion of the abutment body to position the artificial crown Abutment; Dental implants comprising zirconia, characterized in that comprising a.

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