JP2007098054A - Dental implant and abutment for dental implant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dental implant which utilizes the photocatalysis by apatite-coated titanium dioxide, effectively control the accumulation of the dental plaque on the dental implant and can improve the sanitary condition in an oral cavity. <P>SOLUTION: The dental implant includes a fixture 3 which is inserted into a perforated hole 4 of an alveolar bone 9 and is embedded under the gingival margin 8, and the abutment 2 which is fixed to the fixture 3 and supports a dental prosthesis crown 1 on the gingival margin 8, and has a coating section 24 having a coat which is formed on the outer surface of the abutment 2 located between the gingival margin 8 and the dental prosthesis crown 1 and contains the titanium oxide powder covered by hydroxyapatite or hydroxyapatite fluoride. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dental implant and an abutment for a dental implant, and more particularly to an improvement of an abutment that is engaged with a dental implant fixture used for dental treatment and supports a dental prosthetic crown.

  It is already widely known that titanium oxide has a bactericidal action. That is, when titanium oxide is irradiated with ultraviolet rays, water is decomposed and active oxygen is generated by the photocatalytic action of titanium oxide. This active oxygen has a very strong oxidizing power and can decompose organic substances. For this reason, the titanium oxide irradiated with light produces a strong bactericidal action.

  As a conventional technique in which such a photocatalytic action of titanium oxide is applied to the field of dental treatment, there is a cleaning system for sterilizing a dental prosthesis (for example, Patent Document 1). In this cleaning system, a dental prosthesis is placed in a titanium dioxide solution and irradiated with ultraviolet rays to sterilize the dental prosthesis. Therefore, the dental prosthesis must be removed from the patient during cleaning. Is limited to easily removable dental prostheses.

  As another conventional technique, an artificial tooth has been proposed in which a titanium oxide film is formed on the surface and plaque can be decomposed by its photocatalytic action (for example, Patent Document 2). However, the dirty area where plaque is most likely to accumulate is the vicinity of the root of the tooth, that is, the gap between the prosthetic crown and the gingival margin, and even if the surface of the prosthetic crown has a photocatalytic action, it accumulates in the dirty area. Dental plaque cannot be broken down. In general, it is difficult for external light to reach the oral cavity, and in the routine opening and closing operations of the mouth, external light is hardly applied to the back teeth or the back side of the teeth, and a titanium oxide film is applied to the surface of the artificial tooth. Even if formed, it is difficult to obtain a sufficient bactericidal action in normal daily life except for the front side of the front teeth.

On the other hand, as a conventional technique using titanium oxide for a dental implant, there is a dental implant in which a titanium oxide film is formed on the surface of metal titanium (for example, Patent Document 3). In this dental implant, a porous titanium oxide film is formed on the surface of titanium metal, which is a base material of the fixture, to improve biocompatibility with bone tissue.
Japanese Patent Laid-Open No. 2003-34630 JP-A-11-137573 Japanese Patent Laid-Open No. 11-43799

  In general, the root of the natural tooth that intersects the gingival margin has a recess formed by the tooth and gingival margin, and it is easy for plaque to adhere, and it is difficult to remove the adhered plaque by brushing. . For this reason, the dirty region of the tooth where plaque is most likely to accumulate is the immediate upper portion of the gingival margin close to the gingival margin, and in the case of natural teeth, the root portion and the case where a prosthetic crown is attached to the natural teeth. For example, plaque is likely to accumulate in the gap between the prosthetic crown and the gingival margin.

  When the prosthetic crown is attached using a dental implant, it is the abutment that intersects the gingival margin, and the dental prosthesis is attached so as to cover the upper part of the abutment exposed from the gingival margin. The Ideally, such a dental prosthesis is mounted with its lower end in close contact with the gingival margin, but there is a gap between the dental prosthesis and the gingival margin, and one of the abutments. There are many cases where the part is exposed. For this reason, when a dental implant is used, plaque is most easily accumulated in the exposed portion of the abutment, and this portion becomes an unclean area.

  However, none of the conventional dental implants were manufactured considering the accumulation of plaque in the exposed part of the abutment. As described above, external light hardly reaches the oral cavity, and even if a photocatalyst such as titanium oxide is used as a dental treatment material, it cannot be expected to obtain a bactericidal effect in normal daily life. In particular, it is difficult for external light to hit the immediate vicinity of the gingival margin, and the bactericidal effect by the photocatalyst is practically hardly expected. For this reason, there was no practical solution for disinfecting the unclean areas in dental implants.

  Here, as described above, some conventional dental implants are provided with a titanium oxide film, but this titanium oxide film does not utilize photocatalysis and has an affinity for bone cells. The purpose of this was to improve. That is, the titanium oxide film suitable for biocompatibility was only formed on the surface of the fixture fixed to the alveolar bone.

  This invention is made | formed in view of said situation, and it aims at providing the dental implant which can suppress the accumulation | accumulation of plaque effectively and can improve the hygiene state in an oral cavity. Moreover, it aims at providing the abutment for dental implants for implement | achieving such a dental implant. In particular, an object of the present invention is to provide a dental implant and its abutment that can decompose plaque in daily life by utilizing the photocatalytic action of titanium oxide.

  A dental implant according to the present invention includes a fixture that is inserted into a perforation of an alveolar bone and is embedded under a gingival margin, and an abutment that is fixed to the fixture and supports a dental prosthetic crown on the gingival margin, A coating containing titanium oxide powder coated with hydroxyapatite is formed on a part or all of the outer surface of the abutment located between the gingival margin and the dental prosthetic crown. With such a configuration, it is possible to give a photocatalytic action to the gap between the gingival margin and the dental prosthetic crown where plaque is likely to accumulate.For example, if brushing is performed using a toothbrush having a light emitting part on the flocked part of the toothbrush, it is filthy. The gap portion which is a portion can be easily sterilized in normal daily life.

  The abutment for a dental implant according to the present invention includes a fixture engaging portion that engages with a dental implant fixture embedded under the gingival margin, and a prosthetic crown mounting portion on the gingival margin on which the dental prosthetic crown is mounted. And a coating made of hydroxyapatite to which powdered titanium oxide is added is formed on a part or all of the outer surface located between the gingival margin and the dental prosthetic crown.

  Further, in the dental abutment according to the present invention, fluorinated hydroxyapatite is used as the hydroxyapatite. By adding fluorine to hydroxyapatite, the corrosion resistance and abrasion resistance of the coating can be improved, and the above bactericidal effect by the photocatalytic action can be maintained for a long time.

  ADVANTAGE OF THE INVENTION According to this invention, the dental implant which can suppress accumulation | storage of plaque effectively and can improve the hygiene state in an oral cavity can be provided. Moreover, the abutment for dental implants for realizing such a dental implant can be provided. In particular, it is possible to provide a dental implant and its abutment that can decompose plaque in daily life by utilizing the photocatalytic action of titanium oxide.

  FIG. 1 is a view showing an example of a dental treatment instrument including a dental implant according to an embodiment of the present invention. This dental treatment tool is a dental restoration material used in dental implant treatment, and includes a prosthesis 1 and a dental implant 5.

  Dental implant treatment is a dental treatment method in which the prosthesis is fixed to the jawbone in order to make up for the missing tooth, and it supports the prosthesis more firmly than denture treatment in which it is fixed to the adjacent teeth using a bridge. can do. Here, the prosthesis is a substitute for natural teeth made of metal, ceramic, etc., and the prosthesis 1 shown in FIG. 1 is a non-partial prosthesis used to supplement missing teeth, Such a prosthesis is particularly called a prosthetic crown because of its shape.

  The dental implant 5 is composed of an abutment 2 to which the prosthesis 1 is mounted and a fixture 3 fixed to the alveolar bone, both of which are manufactured by casting or cutting of a metal material such as titanium.

  The fixture 3 has a substantially cylindrical shape, and is fixed to the alveolar bone by inserting one end 31 of the fixture 3 into the perforation of the alveolar bone, and the other end serves as a base end portion 32 for detachably attaching the abutment 2. A screw groove is formed on the side surface 33 of the fixture 3, and the fixture 3 is screwed in as a male screw when inserted into the perforation of the alveolar bone. Further, an engagement hole 34 for engaging the abutment 2 is formed in the base end portion 32. The engagement hole 34 is a female screw hole formed in the axial direction of the fixture 3 and having a thread groove formed on the inner surface thereof.

  The abutment 2 includes an attachment portion 21 to which the prosthesis 1 is attached, a cuff portion 22 corresponding to the gingival thickness, and an engagement portion 23 to be engaged with the fixture 3. The mounting portion 21 has a substantially truncated cone shape, and after being ground by a dentist as necessary, the prosthesis 1 is bonded or fitted. The cuff part 22 has a substantially cylindrical shape, and its height is matched with the gingival thickness of the missing part. Generally, a plurality of types of abutments 2 in which the height of the cuff portion 22 is different are provided. For example, abutments having different cuff heights in units of 0.5 mm are provided, and the dentist selects and uses the abutment 2 having a cuff height corresponding to the gingival thickness when attaching the abutment 2. The engagement portion 23 is formed of a male screw that is screwed into the engagement hole 34 of the fixture 3 and detachably engages the abutment 2 with the fixture 3.

  The coating part 24 is a part or all of the outer surface of the abutment 2 on which a film containing a photocatalyst is formed. Here, a region that is adjacent to the cuff portion 22 in the mounting portion 21 and covers the entire circumference of the abutment 2 having a width of 1 mm or more is the coating portion 24. The coating portion 24 is formed with a film containing titanium oxide coated with apatite. When the coating 24 is irradiated with light, the action of titanium oxide as a photocatalyst causes plaque adsorbed on the film. Organic matter can be decomposed.

  (A)-(d) of Drawing 2 is an explanatory view showing a situation of dental implant treatment in order. First, the gingival 7 at the defect is incised to expose the alveolar bone. (A) in the figure shows a state in which the gingiva 7 is incised to perform dental implant treatment on three adjacent missing teeth. In addition, 8 in the figure indicates the gingival margin, that is, the mucous membrane covering the surface of the gingiva 7.

  (B) in the figure shows a state in which three perforations are formed and a fixture is inserted. Drilling is performed on the alveolar bone 9 exposed by gingival incision to form a perforation 4, and the fixture 3 is inserted into each perforation 4. At this time, the depth of each perforation 4 is made to coincide with the length of the fixture 3, and the fixture 3 is embedded so that the base end portion 32 of the fixture 3 coincides with the surface of the alveolar bone 9. After the fixture 3 is embedded in this manner, the gingiva 7 is sutured. In the case of the one-time method, the gingiva 7 is sutured with a healing abutment (not shown) engaged with the fixture engagement hole 34 and the healing abutment exposed on the gingival margin 8. On the other hand, in the case of the two-time method, a cover screw (not shown) is engaged with the engagement hole 34 of the fixture, and the gingiva 7 is completely sutured so as to cover the cover screw.

  (C) in the figure shows a state in which the abutment 2 is engaged with each fixture 3. In the case of the one-time method, after removing the healing abutment, in the case of the two-time method, after incising the gingiva 7 again and removing the cover screw, the exposed engagement hole 34 of the fixture 3 is removed. The abutment 2 is attached by screwing the engaging portion 23 of the abutment 2. At that time, the gingival thickness is measured, and the abutment 2 corresponding to the gingival thickness is selected.

  (D) in the drawing shows a state in which the prosthesis 1 is attached to each abutment 2. The abutment 2 is in a state in which the boundary between the attachment portion 21 and the cuff portion 22 coincides with the gingival margin and only the attachment portion 21 protrudes from the gingival margin. The prosthesis 1 is mounted on the mounting portion 21.

  FIG. 3 is a cross-sectional view showing a state after treatment performed using the dental implant 5 of FIG. The fixture 3 is embedded in the alveolar bone 9 so that the base end portion 32 thereof coincides with the surface of the alveolar bone 9. When a part of the fixture 3 is protruded from the alveolar bone 9 and a force in a direction intersecting the axis of the fixture 3 is applied, stress concentrates on the surface of the alveolar bone 9 and an excessive load is applied to the alveolar bone 9. There is a risk of giving. In order to avoid such stress concentration, the fixture 3 needs to be buried in the alveolar bone 9. On the other hand, the engagement hole 34 needs to be opened. Here, the base end portion 32 of the fixture 3 is made to coincide with the surface of the alveolar bone 9.

  The abutment 2 has the engagement portion 23 screwed into the engagement hole 34, and the fixture in a state where the contact surface of the abutment 2 (here, the lower surface of the cuff portion 22) is in contact with the base end portion 32. 3 is engaged. Here, since the abutment 2 whose cuff height matches the gingival thickness is used, the boundary between the mounting portion 21 and the cuff portion 22 coincides with the gingival margin 8. Therefore, the coating portion 24 of the abutment 2 is a skirt portion of the abutment 2 protruding from the gingival margin 8, that is, a region starting from the gingival margin 8 and extending toward the prosthesis 1 and having a predetermined width. Become.

  The prosthesis 1 is mounted on the mounting portion 21 of the abutment 2, but it is not easy to cover the entire mounting portion 21 with the prosthesis 1, and a gap is generated between the prosthesis 1 and the gingival edge 8. The outer surface of the abutment 2, that is, a part of the mounting portion 21 is exposed from the gap. In particular, in the case of an angle door abutment in which the mounting portion 21 and the engaging portion 23 have different axial directions, the gap is likely to occur. Since such a gap becomes an unclean area where plaque is likely to accumulate, in the abutment 2 according to the embodiment of the present invention, the coating portion 24 is formed in the exposed portion.

  If the case where the boundary between the attachment part 21 and the cuff part 22 does not completely coincide with the gingival margin 8 or the case where the gingival thickness decreases after treatment is considered, the cuff part 22 side starts from the above boundary. It is further desirable to include a region having a predetermined width extending to the coating portion 24. Further, even if the abutment 2 is not clear at the boundary between the mounting part 21 and the cuff part 22, if the position corresponding to the gingival margin 8 can be grasped in advance, the same coating part 24 is formed based on the position. do it.

  Next, the coating film formed on the coating part 24 will be further described. This coating contains powdered titanium dioxide coated with hydroxyapatite.

Titanium dioxide is known as a photocatalyst that decomposes organic substances by generating active oxygen when irradiated with light. Active oxygen is also used when leukocytes enter bacteria, and exerts a strong decomposing action on organic substances. For this reason, if a coating film containing titanium dioxide is formed on the coating portion 24, active oxygen such as O ⁻ , O ₂ ⁻ or O ₃ ⁻ is generated on the surface of titanium dioxide during light irradiation, and bacteria attached to the coating portion 24. Can be broken down strongly.

  In particular, membranes (so-called biofilms) that are produced by biochemical reactions of various bacterial aggregates (bacterial masses) and that surround the bacterial masses (so-called biofilms) are thought to be less effective for antibacterial agents, but are produced by photocatalysis. Such biofilms can be decomposed by using the active oxygen that is produced, and furthermore, toxins produced by bacteria can also be decomposed.

  On the other hand, apatite has excellent adsorptivity for proteins such as bacteria and viruses. For this reason, if powdered titanium dioxide is covered with apatite, organic substances and bacteria can be adsorbed and decomposed, and the base material of the abutment 2 caused by active oxygen generated by photocatalysis can be reduced. , Adverse effects on the living body can be suppressed. That is, apatite-coated titanium dioxide is a material that has both of these advantages and is already commercially available.

  In particular, since hydroxyapatite (HA), which is known as the main component of teeth and bones, is excellent in biocompatibility, titanium dioxide coated with hydroxyapatite (HA) is used for the coating of the coating portion 24. It is desirable to make it contain. However, since this hydroxyapatite (HA) is a relatively brittle material, corrosion resistance and wear resistance can be improved by fluorination and hardening. That is, it is most desirable that the coating of the coating portion 24 contains titanium dioxide coated with fluorinated hydroxyapatite (FHA). Note that the apatite-coated titanium in this specification includes HA-coated titanium and FHA-coated titanium.

  For example, if sodium fluoride is added to a solution having a pH of 7.0 to 7.8 in which calcium phosphate and calcium chloride are dissolved, a solution of fluorinated hydroxyapatite is generated. If titanium dioxide powder is added to this solution, the solid matter will rise. This solid is titanium dioxide coated with fluorinated hydroxyapatite (FHA-coated titanium dioxide). When this solid is separated from the solution, FHA-coated titanium dioxide is obtained.

  The apatite-coated titanium can be coated on the abutment 2 in the same manner as a conventional coating method in which apatite is coated on titanium metal. For example, a thermal decomposition method in which heat treatment is performed after coating to form a film, hydrothermal treatment recrystallization of plasma-sprayed α-TCP to change it to apatite, and apatite raw material is injected into a plasma flame at about 300 ° C. and sprayed. Film forming methods such as a flame spraying method and a plasma spraying method of spraying at an ultrahigh temperature of 10,000 ° C. or higher and an ultrahigh speed are known.

  FIG. 4 is a view showing an example of a toothbrush 6 suitable for a patient using a dental implant according to the present invention. (A) in a figure is sectional drawing of the toothbrush 6, (b) is the external view which made the flocking part 63 the front. The toothbrush 6 irradiates the coating portion 24 of the abutment 2 with light at the same time as brushing, thereby causing a bactericidal action utilizing the photocatalytic action of titanium dioxide.

  The toothbrush 6 includes a handle portion 60 for gripping with a hand, an elongated handle portion 61 extending from the handle portion 60, and a head portion 62 provided at the tip of the handle portion 61. The head part 62 has a flocked part 63 as a flocked surface on which a large number of brush hairs 64 are flocked.

  The handle unit 60 includes a light source device 66 and a vibration device 69. The light source device 66 is a circuit that generates irradiation light to the coating portion 24 of the abutment 2, and uses a small and lightweight LED (Light Emitting Diode) as a light source element. The vibration device 69 is a drive circuit that vibrates the head portion 62 in order to use the toothbrush 6 as an electric toothbrush, and an electric motor is used.

  The light generated by the light source device 66 is guided to the head unit 62 through the light guide unit 67 in the handle unit 61 and is emitted from the light output unit 68. Here, it is assumed that the light guide portion 67 is a hollow portion in the handle portion 61 and the light output portion 68 is an opening formed at the center of the flocked portion 63. In addition, the light guide part 67 can also be comprised with the optical fiber embedded in the pattern part 61. FIG. When the light guide part 67 is a hollow part, it is desirable to deposit a high reflectivity film such as aluminum on the inner surface, or to dispose a reflecting mirror in the bent part.

  The light source device 66 needs to generate light having a wavelength corresponding to the apatite-coated titanium dioxide contained in the coating film of the coating unit 24. Since active oxygen is generated by the action of excited electrons and holes, it is necessary to irradiate light having a wavelength corresponding to the excitation energy of titanium dioxide. In the case of high-purity titanium oxide, the wavelength is 380 nm or less. UV light is required. In this case, for example, an LED using indium gallium nitride (GaInN) that generates ultraviolet light having a wavelength of 370 nm can be used.

  Here, when titanium oxide is doped with a small amount of impurities, photocatalysis occurs even with light having a longer wavelength. For example, if a metal ion other than titanium such as chromium, vanadium, manganese, iron, or nickel is doped, a photocatalytic action can be caused by light in the visible light region (380 nm to 780 nm). Further, the photocatalytic action can be caused by light in the visible light region by doping titanium dioxide with nitrogen. For example, when doped titanium dioxide that causes photocatalysis with light having a wavelength of 550 nm or less is already on the market, and such doped titanium dioxide is included in the coating of the coating portion 24, visible light having a wavelength of 380 nm to 550 nm is used. Can be sterilized. That is, the light source device 66 of the toothbrush 6 can be an LED using GaInN that generates blue (wavelength 450 nm) or green (wavelength 525 nm) light. Thus, if it is the toothbrush 6 which irradiates visible light instead of an ultraviolet-ray, a user can use it in comfort.

  In addition, since the bristle 64 is a consumable item, it is desirable that the head unit 62 is configured to be replaceable. In the illustrated toothbrush 6, the handle portion 61 and the head portion 62 that are integrally formed are detachably attached to the handle portion 60, and only the handle portion 61 and the head portion 62 can be exchanged. Further, the head portion 62 can be detachably attached to the handle portion 61 so that only the head portion 62 can be replaced.

  FIG. 5 is a view showing a state when the toothbrush 6 of FIG. 4 is used. Since a recess is formed in the vicinity of the gap between the prosthesis 1 and the gingival margin 8, plaque easily adheres. Further, since the bristle 64 of the toothbrush 6 is difficult to reach in this gap portion, it becomes an unclean area where plaque is likely to accumulate. When the dental implant according to the present invention is used, since the coating portion 24 of the abutment 2 is exposed from the gap, the gap portion can be sterilized using the photocatalytic action of the apatite-coated titanium dioxide. it can.

  Here, the reason why the bristles 64 are difficult to reach the gap is that the bristles are bent outwardly in contact with the prosthesis 1 and the gingival margin 8. On the other hand, since the light emitted from the head unit 62 travels straight, if the head unit 62 has an appropriate orientation, the light can be irradiated to the gap. In particular, the bristles of the bristles 64 tend to bend in the swinging direction, that is, in the short direction of the head portion 62. The outgoing light can be prevented from being blocked by the hair tips.

  FIG. 6 is a sectional view showing another configuration example of the dental implant according to the embodiment of the present invention. In this dental implant, the abutment 2 does not have the engagement portion 23 as a male screw, and the engagement hole 25 penetrating the inside of the abutment 2 in the axial direction is formed. This engagement hole 25 is a female screw hole that is coaxial and has the same diameter as the engagement hole 34 of the fixture 3. By connecting the lock screw 10 as a male screw to these engagement holes 25 and 34, The abutment 2 and the fixture 3 are engaged.

  The prosthesis 1 has a through hole 11 at the top of the head. The through hole 11 is sealed with a sealing material 12 such as a resin. In the case of this dental implant, if the sealing material 12 is removed, the lock screw 10 can be accessed from the through hole 11 even after the prosthesis 1 is attached. Can be inserted and removed.

  The coating portion 24 is preferably formed on the entire outer surface of the abutment 2 that may be exposed from the gap between the prosthesis 1 and the gingival margin 8, but the present invention is not necessarily in such a case. It is not limited. That is, the coating part 24 should just be formed in at least one part of the outer surface of the abutment 2 which is actually exposed from the said clearance gap or may be exposed.

  Further, it is desirable that the coating portion 24 is not formed on the portion of the mounting portion 21 of the abutment 2 where the inner surface of the prosthetic crown 1 contacts. In particular, when the prosthetic crown 1 is passively fitted, that is, when the prosthetic crown 1 is positioned by bringing the inner surface of the prosthetic crown 1 into close contact with the outer surface of the mounting portion 21, It is desirable that the coating portion 24 is not formed in the portion where the inner surface is in close contact.

  Recently, even when titanium is used as the base material of the abutment 2, it has been reported that the abutment 2 deteriorates due to the influence of fluorine or the like. The dental implant 5 according to the present invention functions as a protective film that protects the outer surface of the abutment 2 that is exposed from the gap between the prosthetic crown 1 and the gingival margin 8. It is also effective in preventing material deterioration.

It is the figure which showed an example of the dental treatment tool containing the dental implant by embodiment of this invention. It is explanatory drawing which showed the mode of the dental implant treatment in order. It is sectional drawing which showed the mode after the treatment performed using the dental implant of FIG. It is the figure which showed an example of the toothbrush 6 suitable for the patient who is using the dental implant by this invention. It is the figure which showed the mode at the time of use of the toothbrush 6 of FIG. It is sectional drawing which showed the other structural example of the dental implant by embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Prosthesis 10 Lock screw 11 Through-hole 12 Sealing thing 2 Abutment 21 Mounting part 22 Cuff part 23 Engagement part 24 Coating part 25 Engagement hole 3 Fixture 31, 32 End part 33 Side surface 34 Engagement hole 5 Dental implant 6 Toothbrush 7 Gingiva 8 Gingival margin 9 Alveolar bone 60 Handle part 61 Handle part 62 Head part 63 Flocking part 64 Brush hair 66 Light source device 67 Light guide part 68 Light emitting part

Claims (3)

A fixture that is inserted into the perforation of the alveolar bone and embedded under the gingival margin;
An abutment secured to the fixture and supporting the dental prosthetic crown on the gingival margin,
A dental implant characterized in that a coating containing titanium oxide powder coated with hydroxyapatite is formed on part or all of the outer surface of the abutment located between the gingival margin and the dental prosthetic crown. A fixture engaging portion to be engaged with a dental implant fixture embedded under the gingival margin;
A prosthetic crown mounting part on the gingival margin on which the dental prosthetic crown is mounted,
An abutment for a dental implant, wherein a coating made of hydroxyapatite to which powdered titanium oxide is added is formed on a part or all of the outer surface located between the gingival margin and the dental prosthetic crown .   The abutment for dental implant according to claim 2, wherein the hydroxyapatite is fluorinated hydroxyapatite.

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