KR20250086952A - Zirconia block for implants and its manufacturing method - Google Patents

Abstract

The present invention relates to a zirconia block for implant in which an abutment link and a fully sintered zirconia block are integrated, and a method for manufacturing the same, characterized by including: a fully sintered zirconia block in which a hollow hole is formed; an abutment link, one side of which is inserted and bonded to one end of the hollow hole and integrated with the fully sintered zirconia block; and a mandrel attached to one surface of the fully sintered zirconia block.

Description

Zirconia block for implants and its manufacturing method {Zirconia block for implants and its manufacturing method}

The present invention relates to a zirconia block for implants, and more particularly, to a zirconia block for implants in which an abutment link and a fully sintered zirconia block are integrated, and a method for manufacturing the same.

Zirconia has high aesthetics because it is similar to the color of teeth, and it is very strong so it can withstand impacts that would break natural teeth. In particular, it is a material that is friendly to the human body and has the advantage of not causing allergic reactions. However, in the case of zirconia material, since the prosthesis must first be processed using semi-sintered zirconia and then go through an additional complete sintering process, there are limitations in using it for chair-side CAD/CAM prosthetics.

In order for zirconia material to be used in same-day prosthetics, the prosthetic material must be completed with a single process as a fully sintered body, rather than a prosthetic manufacturing process that basically involves semi-sintering, processing, and complete sintering. In other words, there must be no additional sintering process after processing. The problem is that high-strength zirconia material has difficulty in CAD/CAM processing for same-day prosthetics due to its high hardness in the complete sintering state.

In addition, since implant structures are usually divided into a fixture corresponding to an artificial tooth root, an abutment which is the abutment, and an implant prosthesis (crown) which is the final restoration, instead of a procedure in which a crown-shaped fully sintered prosthesis is bonded to the abutment while the fixture is implanted in the patient's jawbone, it would be more effective for same-day prosthesis to perform the procedure using a material that combines the abutment and crown at once.

According to registered patent No. 10-0912271, a crown-integrated abutment made of ceramic material in which a crown and an abutment are formed integrally and a method for manufacturing the same have been proposed. This technology includes a step of manufacturing a first preliminary block by processing a block manufactured from a ceramic material such as zirconia, a step of 3D modeling a tooth, a step of modeling a core part to be coupled to an implant fixture and a porcelain part forming the exterior of an artificial tooth outside the core part in the tooth 3D model, a step of processing and sintering the first preliminary block by using the core part model to form the core part, a step of forming a porcelain part block by using the porcelain part model, and a step of forming a crown-integrated abutment by combining the core part and the porcelain part block and injecting porcelain into the porcelain part block.

This type of crown-integrated abutment is made by combining a shell for a porcelain crown with a zirconia abutment, and then injecting porcelain into the shell to complete the structure of the porcelain crown and zirconia abutment. However, since the abutment is semi-sintered, processed, and then goes through a complete sintering process, there are limitations in applying it as a same-day prosthesis material.

In particular, the above-described crown-integrated abutment is simply a crown and an abutment formed as one unit, and cannot be processed and used as an abutment itself, so it has the disadvantage of not being able to be processed and used for various purposes according to the purchaser's intention.

Republic of Korea Patent Publication No. 10-0912271

Accordingly, the present invention is an invention created to overcome the above-described limitations, and the main purpose of the present invention is to provide a zirconia block for implants and a manufacturing method thereof, which can reduce manufacturing costs and time, and can be processed into a crown or an abutment according to the intention of the purchaser.

In addition, another object of the present invention is to provide a zirconia block for implant, which integrates an abutment link and a fully sintered zirconia block, so as to provide an artificial tooth having excellent aesthetic and strength characteristics, and a method for manufacturing the same.

According to an embodiment of the present invention for achieving the aforementioned purpose, a zirconia block for implant is provided.

A fully sintered zirconia block with a hollow hole formed,

It is characterized by including an abutment link that is integrally formed with the fully sintered zirconia block by having one side inserted and bonded to one end of the hollow hole.

Furthermore, the zirconia block for implant described above is characterized by further including a mandrel attached to one surface of the fully sintered zirconia block.

In addition, the above-mentioned fully sintered zirconia block and the above-mentioned abutment link,

혹은

와 무기 폴리머의 성분조합을 가지는 고온용 무기접착제로 접착됨을 특징으로 한다.

Or

It is characterized by being bonded with a high-temperature inorganic adhesive having a combination of inorganic polymers.

Meanwhile, a method for manufacturing a zirconia block for implant according to another embodiment of the present invention is as follows.

A step of preparing a raw material including zirconia powder and oxide additive powder, spray drying a slurry including the raw material, and forming a zirconia block having hollow holes using the obtained composite granules,

A step of debinding and sintering the molded body by heat treatment under atmospheric pressure conditions,

A step of HIP-processing the sintered molded body,

A step of performing a post-heat treatment process on a HIP-treated molded body to obtain a fully sintered zirconia block,

A step of inserting and bonding one side of an abutment link to one end of a hollow hole formed in the above-mentioned fully sintered zirconia block using a high-temperature inorganic adhesive,

It includes a step of attaching a mandrel to one surface of the above-mentioned fully sintered zirconia block.

Furthermore, before attaching the mandrel, the zirconia block to which the abutment link is bonded is dried at room temperature for 24 hours, and then dried at 90°C for 2 hours or longer and at 150°C for 3 hours or longer under atmospheric conditions of normal pressure.

According to the technical problem solving means described above, the zirconia block for implant of the present invention is provided as a single zirconia block for implant by integrating a fully-sintered zirconia block with a simplified production process and an abutment link, so that not only can the manufacturing cost be reduced due to the simplification of the production process, but also the fully-sintered zirconia block can be processed into an implant prosthesis (crown) or an abutment according to the intention of the block purchaser, so that the usability of the fully-sintered zirconia block can be increased.

Figure 1 is an example of the appearance of a zirconia block for implant according to one embodiment of the present invention.
Figure 2 is an exploded perspective view of the zirconia block for implant shown in Figure 1.
FIGS. 3a and 3b are further examples of zirconia blocks for implants according to embodiments of the present invention.
Figure 4 is an example of a crown (112) integrated with an abutment link (110).
Figure 5 is an exemplary diagram illustrating a method for manufacturing a zirconia block for implant according to one embodiment of the present invention.

The detailed description of the present invention described below refers to the accompanying drawings which illustrate specific embodiments in which the present invention may be implemented in order to clearly explain the objects, technical solutions and advantages of the present invention. These embodiments are described in sufficient detail to enable a person skilled in the art to practice the present invention.

Also, throughout the detailed description and claims of the present invention, the word "comprise" and variations thereof are not intended to exclude other technical features, additions, components or steps. Other objects, advantages and features of the present invention will become apparent to those skilled in the art in part from this description, and in part from practice of the invention. The examples and drawings below are provided by way of illustration and are not intended to limit the invention. Moreover, the present invention encompasses all possible combinations of the embodiments set forth herein. It should be understood that the various embodiments of the present invention, while different from one another, are not necessarily mutually exclusive. Accordingly, the following detailed description is not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly so described.

First, FIG. 1 illustrates an external view of a zirconia block for implant according to an embodiment of the present invention, and FIG. 2 illustrates an exploded perspective view of the zirconia block for implant illustrated in FIG. 1. FIGS. 3a and 3b illustrate another shape of a zirconia block for implant according to an embodiment of the present invention.

As shown in Fig. 1, a zirconia block for implant according to an embodiment of the present invention,

A fully sintered zirconia block (112) in which a hollow hole (112a) is formed,

An abutment link (110) that is integrally formed with the fully sintered zirconia block (112) by being inserted and bonded at one end of the hollow hole (112a), and

It includes a mandrel (114) attached to one surface of the above-mentioned fully sintered zirconia block (112). The attachment location of the mandrel (114) can be attached to a location convenient for processing the fully sintered zirconia block (112).

Considering compatibility with milling equipment, it is preferable that the mandrel (114) be packaged and sold attached to a fully sintered zirconia block (112) in which an abutment link (110) is integrated.

The components and manufacturing method of the fully sintered zirconia block (112) will be described in more detail in FIG. 5, and the shape of the fully sintered zirconia block (112) may not only have a cylindrical shape, but may also have a hexahedral shape as shown in FIGS. 3a and 3b.

The formation direction of the hollow hole (112a) formed in the center of the fully sintered zirconia block (112) can also be formed in either the long axis or short axis of the hexahedron, as shown in FIGS. 3a and 3b. The hole specifications of the hollow hole (112a) and the abutment link (110) are also factors that can vary depending on the product line and CAD/CAM of the implant manufacturers.

The lower part of an abutment link (110) made of titanium, which does not cause rejection by the human body and has excellent strength, is inserted into and joined to an insertion groove of a fixture (not shown), and the upper part is inserted into and joined to one end of a hollow hole (112a) formed in the completely sintered zirconia block (112). A screw hole is formed in the central part of the abutment link (110), and the shape of the lower part of the abutment link (110) can be varied to suit the shape of the insertion groove of the fixture to which it is joined.

혹은

와 무기 폴리머의 성분조합을 가지는 것이 바람직하다.The above-mentioned fully sintered zirconia block (112) and the above-mentioned abutment link (110) are bonded with a high-temperature inorganic adhesive. The high-temperature inorganic adhesive must be non-toxic, must maintain adhesive strength up to a high temperature of 1300°C, and must not burn or melt at high temperatures. The high-temperature inorganic adhesive is a thermosetting inorganic adhesive,

Or

It is desirable to have a combination of inorganic polymers.

The fully sintered zirconia block (112) of the zirconia block for implant shown in FIG. 1 and FIG. 3a and FIG. 3b can be processed into a crown or an abutment and used depending on the purchaser's intention. FIG. 4 is an example of a crown (112) integrated with an abutment link (110), showing that the fully sintered zirconia block (112) is processed into a crown.

Hereinafter, with reference to FIG. 5, a method for manufacturing an implant zirconia block in which a fully sintered zirconia block (112) and an abutment link (110) are integrated will be described in more detail.

FIG. 5 is an exemplary flow chart of a method for manufacturing a zirconia block for implant according to one embodiment of the present invention.

Referring to FIG. 5, first, in order to obtain a fully sintered zirconia block, a raw material including zirconia powder and oxide additive powder is prepared (step S100), and a zirconia block having a hollow hole (112a) formed therein is formed using the raw material.

, 4.5 ~ 10.2 mol%의

및 3.5 ~ 7.5 mol%의

또는 79.8 ~ 88.5 mol%의

, 6.0 ~ 10.2 mol%의

및 5.5 ~ 10.0 mol%의

를 포함하는 정방정 지르코니아 복합 분말과, 상기 복합 분말 중량 대비 0 wt% 초과 ~ 2.5wt%의 범위로 첨가되는

나노 분말을 포함하는 원료 물질을 준비한다.More specifically, 79.8 to 92 mol%

, 4.5 ~ 10.2 mol%

and 3.5 to 7.5 mol%

or 79.8 to 88.5 mol%

, 6.0 ~ 10.2 mol%

and 5.5 to 10.0 mol%

A tetragonal zirconia composite powder including a compound of formula (I), and a compound of formula (I) added in a range of 0 wt% to 2.5 wt% relative to the weight of the composite powder.

Prepare a raw material containing nano powder.

The subsequent process differs slightly depending on whether it is injection molding or pressure molding. In the case of injection molding, the slurry containing the raw material is dried, and the raw material powder obtained is mixed with an organic material for injection molding and then injection molded. On the other hand, in the case of pressure molding, the slurry containing the raw material is spray dried to obtain composite granules, which are then molded into zirconia blocks (step S110). (For the components and manufacturing method for the fully sintered zirconia block, refer to the registered patent publication No. 10-1639708, previously filed by the applicant of the present application.)

The formation of the hollow hole (112a) can be implemented directly in the first molding stage, or implemented through secondary processing of the molded product after the first molding without a hole, or implemented by processing the sintered body after sintering is complete. Of course, the shape of the hollow hole (112a) can be created in advance in the mold and the hollow hole (112a) can be formed by pressure molding or injection molding.

Afterwards, the molded body for the zirconia block is heat-treated under atmospheric pressure conditions to undergo degreasing (removal of organic matter) and sintering (densification + imparting ceramic properties) (step S120). Sintering can be performed at a temperature range of 1300 to 1700℃ for 2 to 40 hours.

Afterwards, a hot isostatic press (HIP) process (step S130) is performed for the purpose of densifying and improving the strength of the sintered molded body, and then a post-heat treatment process (step S140) is performed on the HIP-treated molded body to obtain a completely sintered zirconia block (112). In general, the HIP process (step S130) is performed in a reducing atmosphere, and thus may be accompanied by a color change in the block. Therefore, a post-heat treatment process may be performed to implement the required color and shade of the block.

Meanwhile, one end of an abutment link (110) is inserted and bonded (step S150) using a high-temperature inorganic adhesive into one end of a hollow hole (112a) formed in the above-mentioned fully sintered zirconia block (112).

혹은

와 무기 폴리머의 성분조합을 가진다. 상기 어버트먼트용 링크(110)가 접착된 상기 지르코니아 블럭(112)을 상온에서 24시간 건조(1차 건조)시키고, 상압 대기 조건에서 90℃ 2시간 이상과 150℃ 3시간 이상 건조(2차 건조)시켜 어버트먼트용 링크(110)가 일체화된 완소결 지르코니아 블럭(112)을 얻는다.The above high temperature inorganic adhesive

Or

and a combination of inorganic polymer components. The zirconia block (112) to which the abutment link (110) is bonded is dried at room temperature for 24 hours (first drying), and then dried at 90°C for 2 hours or longer and at 150°C for 3 hours or longer under atmospheric conditions of normal pressure (second drying) to obtain a fully sintered zirconia block (112) in which the abutment link (110) is integrated.

The fully sintered zirconia block (112) integrated with the abutment link (110) can be packaged as a product, and a mandrel (114) can be attached to one side of the fully sintered zirconia block (112) (step S160) to package it as a zirconia block for implant (step S170).

According to the embodiments of the present invention described above, the zirconia block for implant of the present invention simplifies the complicated prosthesis production process of the conventional CAD/CAM method artificial prosthesis, which involves the steps of first sintering (semi-sintering), processing, and second sintering (complete sintering), to two steps of sintering and processing, thereby reducing the manufacturing cost of the implant prosthesis. In addition, since the abutment link (110) and the fully sintered zirconia block (112) are integrated and the fully sintered zirconia block (112) can be processed into an implant prosthesis (crown) or an abutment according to the intention of the block purchaser, the utilization of the fully sintered zirconia block is increased.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the appended claims.

Claims (7)

A fully sintered zirconia block having a hollow hole formed therein;
A zirconia block for implant, characterized by including an abutment link, one side of which is inserted and bonded to one end of the hollow hole and integrated with the fully sintered zirconia block. A zirconia block for implant, characterized in that it further includes a mandrel attached to one surface of the fully sintered zirconia block according to claim 1. A zirconia block for implant according to claim 1 or claim 2, characterized in that the fully sintered zirconia block and the abutment link are bonded together with a high-temperature inorganic adhesive. In claim 3, the high-temperature inorganic adhesive comprises:

Or

A zirconia block for implant characterized by having a combination of inorganic polymers. A step of preparing a raw material including zirconia powder and oxide additive powder, drying a slurry including the raw material, and forming a zirconia block having a hollow hole by injection molding or pressure molding the obtained raw material powder;
A step of debinding and sintering the molded body by heat treatment under atmospheric pressure;
A step of HIP-treating the sintered molded body;
A step of performing a post-heat treatment process on a HIP-treated molded body to obtain a fully sintered zirconia block;
A step of inserting and bonding one side of an abutment link into one end of a hollow hole formed in the above-mentioned fully sintered zirconia block using a high-temperature inorganic adhesive;
A method for manufacturing a zirconia block for implant, characterized by including a step of attaching a mandrel to one surface of the above-mentioned fully sintered zirconia block. In claim 5, the high-temperature inorganic adhesive comprises:

Or

A method for manufacturing a zirconia block for implants, characterized by having a combination of components of a metal and an inorganic polymer. In claim 5, before attaching the mandrel,
A method for manufacturing a zirconia block for implant, characterized in that the zirconia block to which the abutment link is bonded is dried at room temperature for 24 hours, and then dried at 90°C for 2 hours or longer and at 150°C for 3 hours or longer under atmospheric conditions of normal pressure.

Images