KR100912272B1 - Ceramic dental implant fixture and manufacturing method for the implant fixture - Google Patents

Abstract

A dental clinic ceramics implant fixture and a manufacturing method thereof are provided, which increase coherence with an alveolar bone by increasing the surface area of the implant fixture. A dental clinic ceramics implant fixture manufacturing method comprises: a step(S11) for manufacturing the feedstock in which the ceramic powder and binder are mixed; a step of injecting the feedstock to form the ejection body in which the body portion and screw part are formed into one body; a degreasing step(S14) removing binder from the ejection body; and a step(S15) for sintering the ejection body.

Description

Dental Ceramic Implant Fixture and Manufacturing Method Thereof {CERAMIC DENTAL IMPLANT FIXTURE AND MANUFACTURING METHOD FOR THE IMPLANT FIXTURE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental implant, and more particularly, to a dental implant fixture and a method for manufacturing the same, which are formed of a ceramic material to improve bonding strength and durability and to prevent surface defects from being processed.

Dental implant (dental implant) means an artificial tooth structure or a method of implantation in place of the teeth partially or entirely replace the teeth. Dental implants generally consist of implant fixtures, which are artificial tooth roots, abutments, and crowns or prosthesis, which are artificial teeth. The implant fixture is placed in the patient's alveolar bone to act as a root, and the prosthesis is formed to be the same or similar to the shape and color of the missing tooth, forming the appearance of an artificial tooth, and the abutment fixing the prosthesis to the implant fixture and It acts to transfer the load acting on the implant fixture and alveolar bone.

In general, the implant fixture is inserted into the human body, so it has to have good biocompatibility and excellent corrosion resistance, so that it is free of side effects and other chemical and biochemical reactivity. In particular, the dental implant fixture has repeated loads and moments. It is very important to choose a suitable material because the mechanical strength must be very high so as not to be deformed and destroyed even under the imposition of pressure. Materials for dental implant fixtures that are widely used at present include titanium or titanium alloys that are easy to process and have high biocompatibility, high mechanical strength and bioinertness to human tissues. In addition, the conventional implant fixture has been used a screw type formed with a thread on the outer peripheral surface in order to improve the compatibility with the alveolar bone during implantation.

However, in the case of implant fixtures formed of conventional titanium or titanium alloys, when the gingiva is retracted, the implant fixtures are reflected from the outside of the gums, resulting in a titanium-specific metallic feeling and discoloration of the gums, resulting in aesthetic problems. there was. In addition, metal ions may be eluted due to friction between the implant and alveolar bone embedded in the alveolar bone due to the pressure caused by the chewing motion, and the metal ions melt into the living body after a long time after implantation of the implant fixture.

In order to overcome this drawback, ceramic materials such as zirconia, which are similar in color to natural teeth, maintain esthetics during gingival retraction and have excellent mechanical strength and fundamentally prevent the dissolution of metal ions, thereby reducing bone loss. It is used in implant fixtures.

On the other hand, one of the biggest problems that occur when using a screw-type implant fixture is bone resorption due to bone loss around the implant fixture is placed. Such bone resorption may weaken the fixation force of the implant fixture, thereby inhibiting the stability of the prosthesis and causing breakage of the prosthesis. Bone resorption is recognized by the non-uniform distribution of the stress acting on the adjacent bone tissue of the implant fixture by palpation and hypoallergenic due to stress concentration. In particular, in the case of ceramic materials such as zirconia, the elastic modulus is twice as high as that of titanium, so the mastication pressure acting on the ceramic implant fixture can exert a higher stress on the alveolar bone. There is a high risk of loss.

In addition, there are various methods for increasing the surface area of the implant fixture in order to increase the bonding force of the implant fixture. In the case of implant fixtures made of titanium or titanium alloy, the surface of the implant fixture is subjected to blasting and acid corrosion treatment. The process of processing to a rough surface by using is widely used.

However, in the case of ceramic implant fixtures, surface defects such as cracking or scratching occur when surface treatment such as blasting occurs.In the case of highly brittle ceramic materials, the main fracture mechanism is surface fracture at room temperature. Such surface defects greatly reduce the fracture strength and toughness of the ceramic implant fixture and are likely to be broken by repeated chewing pressure generated during chewing. In addition, since the ceramic material is superior in chemical resistance to the metal material, acid corrosion treatment is also difficult. In the method of modifying the surface by the plasma spraying method, the ceramic implant fixture and the sprayed layer may be prematurely peeled off after implantation in the human body due to the amorphousness of the surface of the sprayed material by the ultra-high temperature (about 10,000 ° C).

An object of the present invention for solving the above-mentioned problems is to provide a dental implant fixture of a ceramic material and a method of manufacturing the same to increase the surface area of the implant fixture to increase the bonding force with the alveolar bone.

In addition, the present invention is to provide a dental ceramic implant fixture and its manufacturing method that can reduce the risk of bone loss caused by mastication after implantation.

In addition, the present invention is to provide a dental ceramic implant fixture and its manufacturing method which is quick and easy to manufacture, which is advantageous for mass production, and can improve processing precision.

In addition, the present invention can improve the durability and reliability, and to provide a dental ceramic implant fixture and its manufacturing method that can extend the life.

According to embodiments of the present invention for achieving the above object of the present invention, a method for manufacturing a dental implant fixture of a ceramic material to increase the surface area of the implant fixture to increase the bonding force with the alveolar bone, ceramic powder and binder Manufacturing a feedstock by mixing a plurality of main protrusions integrally formed on the surface of the body portion and injecting the feedstock to form an injection molded body integrally formed with the body portion and the screw portion to have a male screw shape; It comprises a degreasing step of removing the binder from the injection molding and sintering the injection molding. Here, the screw portion is formed in the form of a spiral of a predetermined pitch along the outer peripheral surface of the body portion in the form of a screw thread of the plurality of main projections.

The feedstock may be mixed with a ceramic powder such as zirconia and other functional additives for improving various physical properties.

A plurality of tip protrusions having a lower height and size than the main protrusions are formed in a portion of the body portion corresponding to the screw bone in which the main protrusions are not formed. In particular, the shape, size, and arrangement of the main protrusion and the tip protrusion may be variously changed according to required conditions and design specifications. As an example, the main protrusion may have a shape of at least one of a cone, a polygonal pyramid, a truncated cone, a polygonal truncated cone, a cylinder, a polyhedron, and an ellipsoid. In addition, the main protrusions may have the same or different sizes. The tip protrusion may also have a shape of at least one of a cone, a polygonal pyramid, a truncated cone, a polygonal truncated cone, a cylinder, a polyhedron, and an ellipsoid, and may have the same or different sizes. The main protrusion and the tip protrusion may have the same shape, but may have different shapes.

In addition, the screw portion may have a single-threaded screw shape, and the main protrusion may be arranged in one row or two rows or more to form one thread.

On the other hand, according to other embodiments of the present invention for achieving the above object of the present invention, a method for manufacturing a dental implant fixture of a ceramic material to increase the surface area of the implant fixture to increase the bonding force with the alveolar bone, Manufacturing a feedstock comprising a powder, providing the feedstock into a mold, and injecting the feedstock to form an injection molded body having a plurality of protrusions integrally formed on a surface of a body part, in the injection molded body. And a degreasing step of removing the binder, sintering the injection molded body, and machining a surface having the plurality of protrusions formed in the sintered sintered body to form a screw part in the form of a male screw.

Here, the screw part may be formed by processing one or two or more spirals on the surface of the body part in which the protrusion is formed immediately after injection of the injection molded product. And the protrusions are densely arranged to fill the surface of the body portion, it may be regularly or irregularly distributed.

The shape, size, and arrangement of the protrusions may be variously changed according to required conditions and design specifications. As an example, the protrusion may have a shape of at least one of a cone, a polygonal pyramid, a truncated cone, a polygonal truncated cone, a cylinder, a polyhedron, and an ellipsoid. In addition, the protrusions may have the same or different sizes or shapes. Here, after machining to form the screw portion may be formed projections of different sizes on the portion to be a thread and the portion to be screw bone, in particular, the main projection of the portion to be the thread is the tip of the portion to be the screw bone It can be formed to have a large height and size compared to the projection.

On the other hand, according to the embodiments of the present invention for achieving the above object of the present invention, the dental implant fixture of a ceramic material to increase the surface area of the implant fixture to increase the bonding force with the alveolar bone, the body portion and the A plurality of protrusions integrally formed with the body portion is disposed at a predetermined pitch along the outer circumferential surface of the body portion and includes a screw portion formed in a male screw shape. Here, the body portion and the screw portion is integrally formed at the same time by powder injection molding of ceramic powder, the main portion is formed in the screw portion of the screw portion and the screw bone portion of the screw portion is lower than the main protrusion and the size is smaller tip Protuberances are formed.

The shape, size, and arrangement of the main protrusion and the tip protrusion may be variously changed according to required conditions and design specifications. As an example, the main protrusion and the tip protrusion may have a shape of at least one of a cone, a polygonal pyramid, a truncated cone, a polygonal truncated cone, a cylinder, a polyhedron, and an ellipsoid.

In addition, the screw portion may have a single-threaded screw form, and the main protrusions arranged in one or two rows or more may form one thread. Alternatively, a plurality of main protrusions may be arranged to form one thread, but the main protrusions disposed in the thread may be regularly or irregularly disposed. In addition, the tip protrusions are densely arranged so as to fill the surface of the body portion in which the main protrusions are not formed and are regularly or irregularly distributed. The main protrusion and the tip protrusion may have the same shape or different shapes.

The screw portion may be formed by processing the surface of the body on which a plurality of protrusions are formed, and may be formed by forming different protrusion sizes of the portion where the thread is to be formed and the portion where the screw bone is to be formed, and then processing them.

As described above, according to the present invention, first, since the screw portion in the form of threads and screw bone is formed by densely forming a plurality of main protrusions on the surface of the implant fixture, the surface area of the implant fixture can be increased, In particular, by forming the main protrusion integrally with the body portion, it is possible to prevent surface defects that may be caused by machining to form the screw portion and to improve durability.

In addition, by forming a plurality of tip protrusions lower than the main protrusion in the screw portion as well as the main protrusion in the screw portion to increase the surface area of the implant fixture to increase the surface area can effectively increase the bonding force with the alveolar bone.

Secondly, since the screw portion of the body portion and the outer peripheral surface of the implant fixing body through the powder injection process without an additional additional processing process can be formed integrally, it can provide ease and speed of the manufacturing process and reduce the manufacturing cost.

In addition, it is possible to simplify the manufacturing process, which is advantageous for mass production, and can significantly improve the processing accuracy compared to machining.

Third, since there is an effect of dispersing the stress due to the mastication pressure by the fine main and tip protrusions it can reduce the risk of bone loss caused by the implant fixture after implantation.

Fourth, since the body portion, the main protrusion and the tip protrusion is formed integrally, even if various mastication pressure acts for a long time after the implantation, it is possible to prevent the protrusions from peeling off, improve the durability and reliability, and extend the life of the product can do.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. In describing the present invention, a detailed description of known functions or configurations may be omitted to clarify the gist of the present invention. In addition, in the present description, the same numbers refer to substantially the same components, and may be described by quoting contents described in other drawings under these rules.

Hereinafter, a dental ceramic implant fixture according to embodiments of the present invention will be described in detail with reference to FIGS. 1 to 7. For reference, FIG. 1 is a cross-sectional view illustrating a state in which an implant fixture is placed in a patient, and FIGS. 2 to 7 illustrate an implant fixture according to various embodiments of the present disclosure. A front view.

The dental implant 10 is an implant that is an artificial tooth that supports an artificial tooth by being placed in a prosthesis or crown 12 that replaces a partially or totally missing tooth and the alveolar bone 1 of the patient. It consists of a fixture 11.

The prosthesis 102 forms the appearance of an artificial tooth and is coupled to the implant fixture 101. For example, a female screw portion is formed along the longitudinal direction of the central portion of the implant fixture 101, and the prosthesis 102 has the prosthesis 102 in order to improve the coupling force and the holding force with the implant fixture 101. The lower end of the implant fixture 101 is formed in the form of a male screw insertable coupling into the inside. In addition, the prosthesis 102 is tapered so that the portion coupled to the gum 2 of the patient is in close contact with the gum 2 without generating a gap.

The body portion 110 of the implant fixture 101 has a circumferential shape having a predetermined diameter to be implanted in the alveolar bone 1 of the patient, and the end portion inserted into the alveolar bone 1 toward the end in a tapered shape. It can be formed to have a gradually reduced cross-sectional area. In addition, in order to increase the coupling force of the implant fixture 101 and the alveolar bone (1) is formed a screw portion 111 of the thread form on the outer peripheral surface of the body portion (110).

Here, the bone of the human body retains the regenerative force, so that the implant fixture 101 and the alveolar bone 1 that are implanted by the growth of the alveolar bone cells 1 are integrally coupled to each other and the binding force of the implant fixture 101 is maintained. And stability is improved. Therefore, when the surface area of the implant fixture 101 is increased, the bonding force between the implant fixture 101 and the alveolar bone 1 is increased, thereby maintaining the prosthesis 102 stably. In addition, bone loss and bone resorption may occur due to stress transmitted from the implant fixture 101 to the alveolar bone 1 after the implant fixture 101 is implanted. Such bone loss may be caused by the implant fixture. It is facilitated by the non-uniform distribution of stresses acting at 101 and the resulting stress concentration phenomenon. Therefore, by dispersing the stress acting on the implant fixture 101, the risk of bone loss can be reduced by reducing the non-uniform distribution and size of the stress.

According to the present invention, a plurality of fine protrusions 121 and 131 are formed on the outer circumferential surface of the implant fixture 101 to improve the bonding force between the implant fixture 101 and the alveolar bone 1 and reduce the risk of bone loss. Is formed, and in particular, a plurality of main protrusions 121 formed in a predetermined spiral shape to form a screw thread of the screw part 111 and a portion where the main protrusions 121 are not formed, that is, screw bones. It is configured to include a plurality of tip projections (131) formed in the portion.

Referring to FIG. 2, the implant fixture 101 includes a screw portion 111 having a predetermined pitch along the outer circumferential surface of the body portion 110 and the body portion 110 of a predetermined diameter. The 111 includes a screw thread formed by a plurality of conical main protrusions 121 and a screw bone having a plurality of tip protrusions 131 having a height and a smaller size than the main protrusions 121. 110 and the screw 111 is integrally injection molded.

The body part 110 has a circular cross section and is formed in a circumferential shape having a predetermined length. In the exemplary embodiment of the present invention, the body portion 110 has a circular cross section, and an example is described in which a tapered portion having a gradually reduced diameter is formed at an end thereof, but in some cases, the front end of the body portion 110 has a polygonal cross section. Has a plurality of tapered surfaces may be formed on the surface of the body portion 110.

The main protrusion 121 has a sharp vertex and is formed in a conical shape having a circular bottom surface (contact surface) and integrally formed with the body portion 110. For example, the main protrusion 121 is a vertical cone whose axis is perpendicular to the bottom surface, and is formed perpendicular to the surface of the body portion 110. However, the main protrusion 121 may be formed such that the shaft is inclined at a predetermined angle with respect to the bottom surface or the surface of the body portion 110, and the shape of the main protrusion 121 may vary substantially depending on the required conditions and shapes. Can be changed.

In addition, the main protrusion 121 is disposed along the spiral of a predetermined pitch on the outer circumferential surface of the body portion 110, the main protrusion 121 disposed on the spiral is formed so that the bottom surface is adjacent. That is, the plurality of main protrusions 121 arranged in a line form one screw thread, and the spaced portions between the main protrusion 121 and the main protrusion 121 arranged in a line form screw bones. The spacing between the main protrusion 121 and the main protrusion 121 is determined according to the pitch required by the screw part 111. In addition, the height of the main protrusion 121 and the diameter of the bottom surface are also determined by the pitch of the screw portion 111 and the height of the thread.

Here, the main protrusion 121 has a higher height and a larger diameter than the tip protrusion 131 because the main protrusion 121 forms a screw thread. In addition, the main protrusion 121 and the tip protrusion 131 may have the same shape with only different sizes.

The tip protrusion 131 is formed in the screw bone formed by the main protrusion 121, for example, the tip protrusion 131 is formed in a conical shape having a pointed vertex and a circular bottom (contact surface) and the It is formed integrally with the body portion 110. In addition, the tip protrusion 131 may have a vertical cone shape in which the axis is perpendicular to the bottom surface, similar to the main protrusion 121.

On the other hand, although the screw portion 111 is illustrated as having a two-line screw form, the screw portion 111 may have a multi-line screw form of one or three lines. In addition, the main protrusion 121 is arranged in a line, but one screw thread illustrated in the form of two lines of the main protrusion 121 arranged in a line, but the present invention is not limited by the drawings, the main protrusion ( 121) can be gathered in one or three rows to form a thread. Alternatively, the main protrusion 121 is formed along one thread, but unlike the above-described embodiment, the main protrusion 121 may be densely arranged to minimize gaps between the main protrusions 121 adjacent to each other without being aligned in rows. Can be. In addition, the tip protrusion 131 is densely disposed to fill the surface of the body portion 110, and may be regularly or irregularly distributed.

According to the present invention, since the implant fixture 101 has a male screw shape, the implant fixture 101 is easy to be placed on the alveolar bone 1 and is advantageous in maintaining a fixing force and a bonding force after the implantation. In particular, the screw 111 is not only a screw thread is formed by a plurality of fine main protrusions 121 but also a plurality of tip protrusions 131 that are finer than the main protrusions 121 are formed in the screw bone portion of the conventional screw Compared to the implant fixture of the shape can be increased in cross-sectional area effectively increases the bonding force. In addition, since the plurality of fine main protrusions 121 and the tip protrusions 131 distribute the load added to the implant fixture 101 by chewing pressure, the alveolar bone 1 in which the implant fixture 101 is placed and It is possible to effectively reduce the risk of bone loss by increasing the binding force with the alveolar bone 1 without delaying the surrounding tissues, as well as by delaying the absorption rate of the bone tissues.

Here, the implant fixture 101 includes the body 110, the main protrusion 121, and the tip protrusion 131 by powder injection molding (PIM) using ceramic powder. The screw part 111 is integrally formed.

In addition, the shape, size, and arrangement of the main protrusion 121 and the tip protrusion 131 may be variously changed according to required conditions and design specifications in the step of injecting the implant fixture 101. For example, the main protrusion 121 and the tip protrusion 131 may have a shape capable of contacting the contacted portion by at least one of point contact, line contact, and surface contact. For example, the main protrusion 121 may include at least one of a cone, a polygonal pyramid (eg, a pyramid, a triangular pyramid), a frustum (such as a truncated cone, a polygonal pyramid, etc.), a cylinder, a polyhedron (a tetrahedron, a hexahedron, and the like) and an ellipsoid. It can have any one shape. In addition, the tip protrusion 131 may be at least one of a cone, a polygonal pyramid (a pyramid, a triangular pyramid, etc.), a frustum (a cone, a polygonal pyramid, etc.), a cylinder, a polyhedron (a hexahedron, a hexahedron, etc.) and an ellipsoid. It may have a shape of. The main protrusion 121 and the tip protrusion 131 may have different shapes and have the same shape as each other, or may have shapes of different sizes and shapes.

Hereinafter, various modified embodiments of the dental ceramic implant fixture 101 according to the present invention will be described with reference to FIGS. 3 to 7. For reference, the implant fixture 101 shown in FIGS. 3 to 7 is substantially the same except for the shape of the main protrusion and the tip protrusion with the implant fixture 101 of FIG. 2 described above. The same names and reference numerals are used for elements, and redundant descriptions are omitted. In each embodiment, the main protrusion and the tip protrusion use different reference numerals.

As shown in FIG. 3, the implant fixture 101 includes the screw portion 111 protruding from the surface of the body portion 110 to be integral with the body portion 110 and the body portion 110. The screw portion 111 is configured to include a plurality of fine main protrusions 122 are formed along the spiral of a predetermined pitch on the outer circumferential surface of the body portion 110, the main protrusion 122 is not formed A portion of the screw bone portion is formed with a plurality of tip projections 132 having a smaller size than the main projection 122. In particular, the body 110, the main protrusion 122 and the tip protrusion 132 are integrally formed by powder injection molding.

Here, the main protrusion 122 has a pointed vertex and has a square pyramid shape having a square bottom surface. For example, the main protrusion 122 is a vertical square pyramid whose axis is perpendicular to the base, and is formed such that the axis is perpendicular to the surface of the body portion 110. However, the main protrusion 122 may be formed to be inclined at a predetermined angle with respect to the bottom surface or the surface of the body part 110, and the size and arrangement of the main protrusion 122 may be substantially dependent on the required conditions and shapes. Can be variously changed.

The tip protrusion 132 may have a pointed vertex having a shape similar to that of the main protrusion 122 and may have a square pyramid shape having a square bottom surface. Alternatively, the tip protrusion 132 may be at least one of a cone, a polygonal pyramid (a pyramid, a triangular pyramid, etc.), a frustum (a cone, a polygonal pyramid, etc.), a cylinder, a polyhedron (a pentagon, a hexahedron, etc.) and an ellipsoid. It may have a shape of, and the size and arrangement of the tip protrusion 132 may be changed in various ways depending on the required conditions and shapes.

In addition, as shown in Figure 4, the dental ceramic implant fixture 101 according to another embodiment of the present invention has a pointed vertex and has a triangular pyramid shape with a triangular bottom surface formed integrally with the body portion 110 The main protrusion 123 and the tip protrusion 133 having a shape similar to that of the main protrusion 123 are configured to be included. For example, the main protrusion 123 and the tip protrusion 133 are triangular pyramids whose axis is perpendicular to the base, and are formed such that the axis is perpendicular to the surface of the body part 110. However, the main protrusion 123 and the tip protrusion 133 may be formed such that the shaft is inclined at a predetermined angle with respect to the bottom surface or the surface of the body portion 110, and the main protrusion 123 and the tip protrusion 133 The size and arrangement of the can be changed in various ways depending on the conditions and shapes required.

In addition, as shown in Figures 5 and 6, the dental ceramic implant fixture 101 according to another embodiment of the present invention has a frustum shape having a tip portion has a circular or polygonal contact surface (body) It is configured to include a main projection (124, 125) and tip projections (134, 135) formed integrally with the (110). The term frustum includes a truncated cone (comb cylinder), which is a frustum of a normal cone, a truncated pyramid (a non-parallel cube), which is a frustum of a regular square pyramid, and a triangular pyramid (a non-parallel octahedron), which is a frustum of a common triangular pyramid. Of course, it can also include polyhedrons such as ordinary cylinders and hexahedrons and pentahedrons. The shape and structure of the frustum may be variously changed according to the required conditions and design specifications, and the present invention is not limited or limited by the shape and structure of the frustum.

For example, as shown in FIG. 5, the main protrusion 124 has a shape of a rain cylinder having different diameters of upper and lower surfaces (contact surfaces). The tip protrusion 134 has a pointed vertex and a cone shape having a circular bottom surface (contact surface).

Alternatively, as shown in FIG. 6, the main protrusion 125 has a square bottom surface and has a square pyramid shape which is a frustum of a square pyramid. The tip protrusion 135 has a pointed vertex and a square pyramid shape having a square bottom surface.

However, the present invention is not limited by the drawings, and the main protrusions 124 and 125 may have different sizes (or shapes) from the top and bottom surfaces of the main protrusions 124 and 125 like a normal truncated cone or pyramid. have. 2 and 4, the tip protrusions 134 and 135 may have shapes similar to those of the main protrusions 124 and 125. In addition, the size and height of the main protrusions 124 and 125 and the tip protrusions 134 and 135 may be changed in various ways depending on the required conditions.

In addition, as shown in FIG. 7, the dental ceramic implant fixture 101 according to another embodiment of the present invention has a hemispherical shape and an ellipsoidal solid shape and is integral with the body part 110. It is configured to include the main protrusion 126 and the tip protrusion 136 formed. Here, the main protrusion 126 may be circular or oval in its bottom surface. In addition, the tip protrusion 136 also has a similar shape different in size from the main protrusion 126, or a frustum of a cone, a polygonal pyramid (a pyramid, a triangular pyramid, etc.), a cone and a polygonal pyramid (a cone, a polypyramid, etc.). It may have a shape of at least one of a cylinder, a polyhedron (pentahedron, a hexahedron, etc.) and an ellipsoid. In addition, the size and height of the main protrusion 126 and the tip protrusion 136 may be changed in various ways depending on the required conditions.

In the above-described and illustrated embodiments of the present invention, only one type of main protrusion and tip protrusion are described, but in some cases, each of the above-described main protrusions and tip protrusions formed to have different shapes may be simultaneously applied. .

In addition, in the above-described and illustrated embodiments of the present invention, the main protrusions are arranged in two rows to form one thread, but the arrangement and number of the main protrusions forming the thread may be applied in various ways. have.

According to the present invention, the implant fixture 101 is integrally formed with the body 110, the main protrusion 121, and the tip protrusion 131 by injection molding (PIM) of ceramic powder. do. Hereinafter, reference numerals of the main protrusions and the tip protrusions are used as 121 and 131, respectively, and a method of manufacturing the dental ceramic implant fixture 101 of the present invention will be described with reference to FIG. 2, but shown in FIGS. 3 to 7. One embodiment also applies substantially the same.

Hereinafter, a method of manufacturing the dental ceramic implant fixture 101 will be described with reference to FIGS. 8 and 9. 8 is a flowchart illustrating a method of manufacturing the implant fixture 101 according to an embodiment of the present invention, Figure 9 is a process chart for explaining the manufacturing method of the implant fixture 101.

Referring to the drawings, the method of manufacturing the implant fixture 101 is a step of manufacturing a feedstock (feedstock) 30 including ceramic powder (S11), a plurality of fine main protrusions 121 spiral of a predetermined pitch The feedstock 30 so as to form the body portion 110 formed with the screw portion 111 is formed of a screw bone formed of a plurality of tip protrusions 122 formed of a screw thread formed and smaller than the main protrusion 121 is formed. Powder injection molding step (S12) to inject the injection molding (100a) to form the injection molding (100a), solvent debinding step (S13) and hot degreasing to remove the solvent from the injection molding (100a) The thermal debinding step S14, and the step S15 of sintering the degreased injection body 100a may be performed.

First, in order to form the implant fixture 101, a feedstock 30 is manufactured by mixing a predetermined ceramic powder and a binder (S11). The feedstock 30 is manufactured by mixing the ceramic powder and the binder at an appropriate temperature in a predetermined mixing ratio so that the feedstock 30 can be easily supplied to the injection molding machine 10. For example, the feedstock 30 is formed by mixing 30 to 70% of the binder with respect to the ceramic powder and the total volume of the ceramic powder. Here, the mixing ratio of the ceramic powder and the binder may be variously changed according to the required conditions, and the present invention is not limited or limited by the mixing ratio of the ceramic powder and the binder.

The binder is mixed for the purpose of imparting fluidity to uniformly inject the ceramic powder, which is a raw material, into the mold 20 during the injection process, and for improving the strength of the injection molded body 100a formed in the mold 20. . As a binder, a conventional single binder may be used, and in some cases, various kinds of binders having different melting points may be used together. For example, the binder may be formed of a quantitatively mixed mixture of paraffin wax, polyethylene, polypropylene, stearic acid, and the like. In addition, the feedstock 30 may be a binder, a lubricant, a plasticizer, a surfactant, or the like, or a mixture thereof may be added as a binder. The ceramic powder and the binder are uniformly mixed in the injection molding machine 10 (that is, feedstock) and injected into the mold 20.

Next, the feedstock 30 is injected into the mold 20 by using a conventional injection molding machine 10 to form the injection molded body 100a (S12). The mold 10 has a cavity 21 having a predetermined shape so that the screw part 111 including the body part 110, the main protrusion 121, and the tip protrusion 131 may be integrally formed. Is formed, and the feedstock 30 is transported while being mixed in the cylinder 11 of the injection molding machine 10 and injected into the cavity 21 through the nozzle 12 of the injection molding machine 10. By cooling and solidifying the inside of the mold 20, the injection body 100a of the implant fixing body 101 in which the screw part 111 is integrally formed may be taken out.

Here, the injection molding 100a has an increased volume than the implant fixture 101 to be finally formed in consideration of the volume reduction in the degreasing step (S13, S14) and the sintering step (S15).

Next, a degreasing step (S13, S14) is performed to remove some of the binder contained in the injection molding (100a).

Here, when the binder includes a plurality of binders having different characteristics (for example, melting points), the degreasing steps S13 and S14 may be substantially performed several times instead of a single step. For example, a solvent degreasing step S13 for removing the binder using a solvent and a hot degreasing step S14 for removing the binder by applying heat are performed. In detail, the solvent degreasing step S13 may include N-hexane, heptane, thinner, and the like in the injection molding 100a to remove waxes such as paraffin wax in a binder. It is carried out using the same solvent. The hot degreasing step S14 removes the remaining binder by applying heat to the injection molded body 100a on which the solvent degreasing step S13 is performed. In addition to the solvent degreasing step (S13) or the hot degreasing step (S14), other degreasing processes such as electrolytic degreasing and ultrasonic degreasing may be applied. In addition, in the hot degreasing step (S14), the injection molded body 100a is heated to a temperature that can be presintered after hot degreasing.

Next, after the hot degreasing step (S14) to remove the pores of the degreased injection molding (100a) by sintering at a constant temperature condition to have a mechanical strength, the manufacture of the implant fixture 101 is completed (S15).

In the sintering step (S15), the sintering is performed under suitable temperature conditions, holding time and atmosphere depending on the type and particle size of the ceramic powder and the type of additive. Here, the hot degreasing step S14 and the sintering step S15 may be simultaneously performed in the same sintering furnace. That is, since the hot degreasing may be performed while sintering the injection molded body 100a in which a part of the binder is removed through the solvent degreasing step S13, the process may be shortened.

On the other hand, unlike the embodiment described above, the implant fixture (hereinafter referred to as sintered body 100b (see FIG. 9)) formed after sintering the injection molded body 100a in which predetermined protrusions are integrally formed is machined to have a predetermined pitch. It is also possible to form an implant fixture having a screw portion.

Hereinafter, a method of manufacturing an implant fixture 101 and an implant fixture 101 formed by the method of manufacturing the implant fixture 101 according to another embodiment of the present invention will be described with reference to FIG. 10. The embodiments described below are substantially the same as the above-described embodiments, the same reference numerals are used for the same components, and descriptions overlapping with the above-described embodiments will be omitted. In addition, the manufacturing method of the implant fixture 101 described below is substantially the same as the manufacturing method of the implant fixture described above with reference to FIGS. 8 and 9 except for the post-injection processing step, and thus is omitted for convenience of description. do.

The implant fixture 101 has a predetermined diameter and length and has a male screw shape of a predetermined pitch. The implant fixture 101 forms a sintered body 100b by injecting and sintering the injection body 100a having a plurality of fine protrusions 141 integrally formed on the surface of the body part 110, and the sintered body 100b. It can be produced by forming the screw portion 112 having a predetermined pitch and height by the conventional processing on the surface of.

The body 110 has a circular cross section of a predetermined diameter and is formed in a circumferential shape having a predetermined length. The present invention is not limited thereto, and the body part 110 may have a circular cross section, and a tapered part having a gradually reduced diameter may be formed at an end thereof. In some cases, the front end of the body part 110 may have a polygonal shape. It has a cross section and a plurality of tapered surfaces may be formed on the surface of the body portion 110.

The protrusion 141 may have the shape of at least one of a cone, a polygonal pyramid (a pyramid, a triangular pyramid, etc.), a frustum (a cone, a polygonal pyramid, etc.), a cylinder, a polyhedron (a pentagon, a hexahedron, etc.) and an ellipsoid. Can have

For example, as illustrated in FIG. 10, the conical protrusion 141 sinters the injection body formed densely along the surface of the body part 110 to form a sintered body 100b, and then the sintered body 100b. May be machined to form the screw portion 112 of a predetermined pitch. Here, the screw portion 112 is formed by processing the surface of the body portion 110 is formed with the conical protrusion 141, the upper portion of the protrusion 141 is cut in the screw bone portion of the screw portion 112. Will take the shape of a truncated cone. Here, the degree and number of the protrusions 141 of the screw bone portion may be changed in various ways by the pitch and the height of the screw portion 112.

On the other hand, the protrusion 141 is disposed in the form of a predetermined spiral along the outer circumferential surface of the body portion 110, as in the above-described embodiments, or is arranged to densely fill the surface of the body portion 110 rather than a spiral It is also possible. In addition, in FIG. 10, one type of protrusions 141 having the same size and shape are described as an example. However, as shown in the above-described embodiments, the portion and the screw bone to be screwed after the machining of the screw part 112 are described. It is also possible to form differently the size and shape of the projection 141 of the portion to be. For example, the protrusion 141 formed on the portion to be a screw thread may form a protrusion having a height and a size larger than those of the protrusion formed on the screw bone portion. In addition, in some cases, the above-described protrusions formed to have different shapes may be applied at the same time.

Here, the ceramic material is brittle, particularly, when forming a screw portion by processing a relatively smooth cylindrical surface may cause surface defects such as scratches or scratches, according to the present invention a plurality of fine on the surface of the body portion 110 Since the protrusions 141 are formed, the micro-projections 141 are processed instead of the body 110 itself, so that surface defects may be prevented from being generated.

In detail, according to the present invention, since the portion substantially removed by processing is the protrusion 141, even if scratches or scratches are generated by the processing, there is little effect on the body 110 itself. Here, the protrusion 141 is not a defect because the injection molded integrally with the body portion 110. In addition, according to the present invention, the processing of the protrusion 141 is easy to process due to the small volume to be substantially removed, compared to the case of processing a smooth surface, and has the advantage of reducing the consumption of materials. In addition, according to the present invention, since the surface formed with the plurality of protrusions 141 is formed compared to the screw portion 112 formed by simply processing a cylindrical surface to form the screw portion 112, a plurality of protrusions as described above By 141, it is possible to improve the effect of reducing the bone resorption and risk of bone loss by improving the binding force and load distribution.

In addition, according to the present invention, the injection molded body 100a having a plurality of fine protrusions 141 integrally formed on the surface of the body part 110 is injected and sintered to form a sintered body 100b, and thus, the sintered body 100b. In the case of forming the screw portion 112 having a predetermined pitch and height by the conventional machining on the surface thereof, the predetermined sintered body 100b is formed by post-processing by the conventional machining, so that various heights are formed in the same mold. It has the advantage of being able to manufacture an implant fixture having a screw bone and a pitch.

On the other hand, the processing of the screw portion 112 can be formed not only immediately after the sintering, but also immediately after the injection molding, solvent degreasing or hot degreasing immediately after the processability is better than after sintering.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a cross-sectional view showing a dental implant according to an embodiment of the present invention;

2 to 7 is a front view for explaining a dental ceramic implant fixture according to embodiments of the present invention;

8 and 9 are a flow chart and a flow chart for explaining a method for manufacturing a dental ceramic implant fixture according to an embodiment of the present invention;

10 is a front view of an implant fixture formed by a dental ceramic implant fixture manufacturing method according to another embodiment of the present invention.

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

1: alveolar bone 2: gum

10: injection molding machine 11: cylinder

12: nozzle 20: mold

21: core 30: feedstock

100: implant 100a: injection molding

100b: sintered body 101: implant fixture

102: prosthesis 110: body portion

111, 112: screw section

121, 122, 123, 124, 125, 126: main projection

131, 132, 133, 134, 135, 136: tip protrusion 141: protrusion

Claims (16)

Preparing a feedstock in which ceramic powder and binder are mixed; Ejecting the feedstock to form an injection molded body integrally formed with the body portion and the screw portion so as to have a plurality of main protrusions integrally formed on the surface of the body portion and having a male screw shape; A degreasing step of removing the binder from the injection molded body; And Sintering the injection molded body; Including, The screw portion is a method of manufacturing a ceramic ceramic implant fixture, characterized in that the plurality of main protrusions are formed in the form of a screw thread of a predetermined pitch along the outer peripheral surface of the body portion in the form of a screw thread. The method of claim 1, And a plurality of tip protrusions having a lower height and a size than the main protrusions are formed in a portion of the body portion corresponding to the screw bone in which the main protrusions are not formed. The method of claim 2, And the main protrusion and the tip protrusion have a shape of at least one of a cone, a polygonal pyramid, a truncated cone, a polygonal truncated cone, a cylinder, a polyhedron, and an ellipsoid. The method of claim 3, The main protrusions have the same or different sizes, and the tip protrusion also has the same or different sizes of dental ceramic implant fixture manufacturing method. The method of claim 3, And the main protrusion and the tip protrusion have the same shape or different shapes. The method of claim 3, The screw unit has a single-threaded screw form, wherein the main projection is arranged in a row or two rows or more to form a single thread of the dental ceramic implant fixture. Preparing a feedstock mixed with ceramic powder and a binder; Injecting the feedstock to form an injection molded body having a plurality of protrusions integrally formed on a surface of a body part; A degreasing step of removing the binder from the injection molded body; Sintering the injection molded body; And Machining the surface on which the plurality of protrusions are formed in the sintered sintered body to form a screw part having a male screw shape; Dental ceramic implant fixture manufacturing method comprising a. The method of claim 7, wherein And the screw part is formed by processing the surface in which the protrusion is formed immediately after the injection of the injection molded body in one or two or more spirals. The method of claim 8, The protrusion is densely disposed to fill the surface of the body portion, the protrusion is a dental ceramic implant fixture, characterized in that having at least one of the shape of a cone, polypyramid, truncated cone, polygonal truncated cone, cylinder, polyhedron and ellipsoid. Manufacturing method. The method of claim 9, The protrusion is a dental ceramic implant fixture manufacturing method, characterized in that having the same or different sizes or shapes. The method of claim 9, After machining to form the screw portion, the projections of different sizes are formed on the portion to be screwed and the portion to be screw bone, and the main protrusion of the portion to be the thread is larger than the tip projection of the portion to be the screw bone. Dental ceramic implant fixture manufacturing method characterized in that it has a size. Body portion; And A plurality of protrusions integrally formed with the body portion and disposed at a predetermined pitch along the outer circumferential surface of the body portion to form a male screw; Including, The body portion and the screw portion are integrally formed at the same time by powder injection molding of ceramic powder, and the main protrusion is formed on the threaded portion of the screw portion, and the tip protrusion has a lower height and a smaller size than the main protrusion on the screw valley portion of the screw portion. Dental ceramic implant fixture, characterized in that formed. The method of claim 12, And the main protrusion and the tip protrusion have a shape of at least one of a cone, a polygonal pyramid, a truncated cone, a polygonal truncated cone, a cylinder, a polyhedron, and an ellipsoid. The method of claim 13, The screw unit has a single-threaded screw form, the main ceramic protrusions arranged in a row or two or more lines to form a single thread of the dental ceramic implant fixture. The method of claim 14, And the tip protrusion is densely arranged to fill the surface of the body portion in which the main protrusion is not formed, and is regularly or irregularly distributed. The method of claim 13, And the main protrusion and the tip protrusion have the same shape or different shapes.

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