KR101265969B1 - Manufacturing method of customized abutment for implant having enhanced adatation - Google Patents

Abstract

PURPOSE: A manufacturing method of a custom implant abutment with enhanced adaptation is provided to secure the connectivity of an abutment and a crown and reduce the manufacturing cost. CONSTITUTION: A manufacturing method of a custom implant abutment relates to a dental implant prosthesis which comprises a fixture in an alveolar bone; an abutment(120) coupled to the fixture, and a crown(130) formed on the abutment. A manufacturing method of a custom implant abutment comprises: drawing out the shape of the abutment from the outer appearance of the dental implant prosthesis; setting the contact line of the outer surface of the abutment and the crown as a chamfer outline; setting a chamfer surface from the chamfer outline; setting a taper which protrudes into a conical shape from the chamfer surface; and processing the set chamfer surface and the shape of the taper by 3D cutting method.

Description

MANUFACTURING METHOD OF CUSTOMIZED ABUTMENT FOR IMPLANT HAVING ENHANCED ADATATION}

The present invention relates to a dental implant prosthesis, and more particularly, to a custom abutment shape that can obtain an optimal adaptation in the dental implant prosthesis including the fixture, abutment, crown.

In general, an implant (implant) refers to a replacement that is originally restored when human tissue is lost, but in the dentist refers to the placement of artificial tooth replacement. To replace the lost root (root), a root made of titanium or the like which does not have a rejection reaction to the human body is planted in the alveolar bone that has passed through the tooth, and then the tooth is restored by fixing the artificial tooth.

In general prostheses or dentures, the surrounding teeth and bones are damaged after a while, but the dental implant prosthesis does not injure the surrounding tooth tissue and has the same function and shape as the natural teeth and does not cause cavities. have.

In addition, dental implant prostheses enhance the function of dentures in single-tooth restorations, as well as in partial and total toothless patients, and improve the aesthetic aspects of dental prosthesis restoration. Furthermore, it disperses excessive stress on surrounding supportive bone tissue and helps stabilize teeth.

As described above, the dental implant restoration procedure is divided into a gingival bone, that is, a surgical procedure for implanting a fixture on an alveolar bone, and a prosthetic procedure for attaching a tooth replacement to an abutment on a planted fixture.

There are a variety of procedures for the dental implant prosthesis. An example of the procedure is as follows. The dental implant prosthetic treatment method described below is a fixture level impression method for completing the model in the oral cavity by connecting impression copings in the oral cavity when the impression is made in the prosthodontic process.

First, drilling and tapping are performed on the alveolar bone to form a groove conforming to the dimension of the fixture, and a mount is fastened to the upper portion of the fixture. Then, using a surgical handpiece, the fixture and mount are inserted into the alveolar bone, and then the mount is removed from the fixture, thereby implanting the fixture in the alveolar bone.

The first operation is completed by fastening the cover screw to the top of the fixture and sealing the fixture.

The cover screw prevents bacteria and foreign substances present in the oral cavity from entering the fixture while waiting for the fixture's osseointegration. The duration of ossification is somewhat different depending on the patient's bone quality and implantation position, but usually takes 3 to 6 months.

Next, the gums are opened through a secondary operation to expose the cover screw, check the degree of fusion of the fixture, and remove the cover screw. Healing abutments are fastened to the top of the fixture for aesthetic gum formation and wait for two to three weeks. In recent years, in order to improve the complexity of the second procedure, a first procedure of directly fastening the healing abutment and omitting the process of fastening and removing the cover screw is sometimes used.

Next, after confirming aesthetic gum formation, the healing abutment is removed, and the impression coping is fastened to the upper portion of the fixture to produce a prosthesis. The impression material is then used to create a preliminary impression in the mouth and remove impression copings.

Subsequently, the tooth model is manufactured, the artificial tooth, that is, the artificial crown is pore-finished, then abutments are fastened to the upper part of the fixture, and the upper prosthesis (ie, the crown) is fixed on the abutment to complete the implant prosthesis.

An object of the present invention is to propose a method that can be produced by deriving the shape of the abutment from the appearance of the dental implant prosthesis, to provide an abutment that can secure the coupling force of the crown and the abutment and reduce the cost have.

Another object of the present invention is to provide an abutment which can bring about the effect of improving productivity and reducing post processing by limiting the shape of various abutments in a certain range.

Still another object of the present invention is to present a criterion of the shape of an abutment manufactured by using cutting equipment so that no raw region is generated and no excessively processed region is generated.

In addition, the present invention provides an abutment shape that allows the abutment and the crown to have an optimal coupling force.

The present invention for achieving the object, in the abutment of the dental implant prosthesis comprising a fixture inserted into the alveolar bone, an abutment fastened to the fixture, and a crown coupled to the abutment, the After the margin of the contact line between the outer surface of the abutment and the crown of the upper prosthesis is set to the chamfer outer line, the chamfer surface is set to have a predetermined range of width and a predetermined range of angles from the chamfer outer line, and then the chamfer surface In the conical protruding shape of the taper is set, it provides an abutment characterized in that the precision machining to the tapered shape and the set chamfer surface.

The width of the chamfer surface is preferably set in the range 0.1 ~ 2mm. At this time, the angle of the chamfer surface is more preferably set in the range of 45 ~ 60 degrees.

On the other hand, the taper is preferably in the range of 2 to 10 degrees taper angle.

The interface between the chamfer surface and the taper is formed as a curved surface, the interface between the chamfer surface and the taper when the diameter 2.0mm cutting tool is used is preferably formed as a curved surface of the curvature radius (CR) 1.0 ~ 1.5mm. The radius of curvature CR of the interface between the chamfer surface and the taper is in a range of 100 to 150% of the radius of the cutting tool based on the cutting tool radius.

In addition, the upper edge of the taper is preferably a radius of curvature (TR) of 1.0 ~ 1.5mm range when using a 2.0mm diameter cutting tool. This ranges from 100 to 150% of the cutting tool radius relative to the cutting tool.

On the other hand, another aspect of the present invention may be provided with a protrusion on the upper surface of the taper in accordance with the material of the crown, but in a state in which a minimum thickness of 0.3mm or more is secured, the volume of the crown upper portion can be reduced.

And, the abutment is more preferably provided with a TiN coating layer on the surface.

The present invention derives the shape of the abutment, which plays an important role in securing the durability of the dental implant prosthesis, from the appearance of the final dental implant prosthesis, thereby securing the bonding force of the abutment and the crown to ensure the durability of the dental implant prosthesis. It has the effect of improving and reducing side effects.

The present invention by limiting the abutment shape to be produced separately according to the tooth shape in a certain range, thereby reducing the time and effort required to design the abutment shape improves productivity and reduces the cost.

In addition, the abutment shape limitation of the present invention has the effect of reducing the occurrence of machining errors during machining by the cutting equipment to ensure that the abutment and the crown has an optimal coupling force.

1 is a partial cross-sectional view showing the external structure and internal structure of the dental implant prosthesis,
Figure 2 is a view showing the appearance of the custom abutment using precision machining according to an embodiment of the present invention,
3 is a view showing the main part of the custom abutment using precision machining according to the first embodiment of the present invention,
4 is an enlarged view of a portion A of FIG. 3 showing an angle of a chamfer surface of a custom abutment using precision machining according to a first embodiment of the present invention;
5 is an enlarged view of a tapered curvature of the tapered upper surface of the customized abutment using precision machining according to the first embodiment of the present invention.
6 is a view showing the main part of the custom abutment using precision machining according to the second embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to a custom abutment using precision machining according to an embodiment of the present invention.

1 is a view schematically showing the external structure and internal structure of the dental implant prosthesis.

As shown, the dental implant prosthesis is the fixture 110 is inserted into the alveolar bone, the abutment 120 is fastened to the fixture, and the abutment 120 wraps around the appearance of the final dental implant prosthesis And a crown 130 to form.

In the drawing, a portion below the one-dot chain line shows a cross-section, and a portion above the one-dot chain line schematically shows a side surface.

The crown 130 is made of a precious metal alloy containing gold (Au) or a non-precious metal or semi-precious metal alloy containing no gold, a ceramic material, or a precious metal, non It can be manufactured using various dental materials such as noble or semi-precious metals and ceramics.

The appearance of the crown 130 is determined using the shape of the tooth extracted by the patient, the shape of the occlusal teeth to bite, and the like.

And the inner surface shape of the crown 130 is produced in a shape corresponding to the outer shape of the abutment.

The present invention proposes two types, in which the abutment top is formed flat and the abutment top is formed to correspond to the crown shape.

Flattening the abutment can reduce machining costs, machining time, design time, and post-processing time, while reducing the incidence of unprocessed areas or over-deletion. You can,

When the upper part of the abutment is formed to correspond to the crown shape (final tooth shape), the processing cost and time of the abutment and crown are increased accordingly, while the load distribution effect of the abutment is maximized, and the high-end product has high durability. Can be prepared.

The combination of the crown 130 and the abutment 120 is coupled with the adhesive force by the fitting and the adhesive by the shape.

However, as described above, the crown 130 is made of a metal or ceramic material including a noble metal, and as the volume occupied by the crown 130 increases, processing cost and cost increase.

The present invention is to reduce the cost by optimizing the appearance of the abutment and to secure the coupling force of the abutment 120 and the crown 130.

Figure 2 is a view showing the appearance of the custom abutment using precision machining according to an embodiment of the present invention.

The abutment 120 has a portion inserted into the gum and a portion protruding to the outside of the gum, and the portion protruding to the outside of the gum is wrapped with the crown 130.

The portion inserted into the gum in the abutment 120 has a shape corresponding to the gum and has a shape for fastening with the fixture.

The portion protruding out of the gum in the abutment 120 should be easily coupled with the crown 130, it should be firmly coupled.

When manufacturing a dental implant prosthesis having the same shape, the volume of the abutment 120 increases when the volume of the abutment 120 decreases, and conversely, when the volume of the abutment 120 decreases, As the volume increases, as described above, the volume increase of the crown 130 is disadvantageous in terms of cost and processability, so it is better to increase the volume of the abutment 120 as much as possible. In addition, since the abutment 120 has a relatively higher strength than the crown 130, when the volume of the abutment 120 is manufactured according to the shape of the crown and the minimum thickness capable of normal functional configuration, It is advantageous from the side.

The present invention proposes an abutment shape that is advantageous in terms of ease of coupling, securing of bonding force, and cost reduction.

The present invention provides an abutment manufactured by precision machining, and the material of the abutment may be a material such as metal, ceramic, or synthetic resin such as titanium (Ti) in consideration of workability and strength.

When the abutment 120 is made of titanium or a titanium alloy material, it is more preferable to provide a TiN coating layer on the entire surface.

TiN coating layer has a gold color, not only excellent aesthetics, but also high strength and hardness compared to titanium, and has excellent corrosion resistance.

The TiN coating layer can be formed by a sputtering method, an arc plasma method, or the like.

As shown in FIG. 2, the abutment 120 has an annular chamfer surface 122 which is in contact with the bottom surface of the crown 130, and a taper protruding conically from the inside of the chamfer surface 122. 124). Here, the annular means the shape of a closed curve wider than round and oval.

The chamfer surface 122 is an annular curved surface partitioned by the chamfer outer line 122a and the chamfer inner line 122b.

The chamfer outer line 122a is a linear portion generated by the contact between the abutment outer surface and the upper prosthesis crown and is called a margin.

The margin can be located above or below the virtual line, with the highest points of the gum around the dental implant substitute connected. The approximate margin is determined by the dentist based on the individual patient's dental condition. It may be ordered a few millimeters below or a few millimeters above.

The chamfered surface 122 is preferably spliced to and connected to the lower end surface of the crown 130, and preferably has a certain range of width and a certain range of angles.

The taper 124 has a conical shape in which the cross-sectional area becomes narrower toward the upper portion, which is coupled to the crown 130 and the abutment because the crown 130 is fitted into the top of the abutment 120. This is to facilitate the coupling of the cement 120.

An angle formed between the central axis TC of the taper 124 and the side surface TS of the taper is called a taper angle TA, and the taper angle TA is preferably in the range of 2 to 10 degrees.

When the taper angle TA is less than 2 degrees, excessive force is required when fitting the crown 130, or a problem that the crown 130 is not fully fitted is more likely to occur.

When the taper angle TA exceeds 10 degrees, the volume occupied by the crown 130 at the upper portion increases, unnecessarily increasing the cost, and the coupling force with the crown is lowered.

3 is a view showing the main part of the custom abutment using precision machining according to the first embodiment of the present invention.

The first embodiment shows a popular abutment that reduces the time and cost of processing by forming the upper portion of the taper flat.

The width and thickness of the chamfer surface 122 partitioned by the chamfer outer line 122a and the chamfer inner line 122b are important variables. The chamfer surface 122 is a portion that receives load from the crown and distributes it, and has a great influence on durability.

The width CL of the chamfer surface 122 refers to a horizontal distance between the chamfer outer line 122a and the chamfer inner line 122b. The width of the lower end of the crown 130 is increased by the width of the chamfer surface 122. Is determined.

When the width CL of the chamfered surface 122 is 1 mm, the thickness of the lower end of the crown 130 should correspond to 1 mm. Here, the meaning of correspondence means that it should be the same or as small as the gap for application of the adhesive. For example, if a gap of 0.1 m is set as the gap for applying the adhesive, the thickness of the lower end of the crown 130 is 0.9 mm.

Specifically, the width CL of the chamfered surface 122 is preferably in the range of 0.1 to 2 mm. When the width CL of the chamfer surface 122 is less than 0.1 mm, the thickness of the bottom of the crown is narrowed, so that the adhesion area between the crown bottom and the chamfer surface 122 is narrow, so that the coupling force is weak, and the load of the crown cannot be properly distributed.

On the contrary, if the width CL of the chamfer surface 122 exceeds 2 mm, the thickness of the bottom of the chamfer becomes unnecessarily thick, thereby increasing the cost, and increasing the amount of porcelain used during the buildup process using porcelain, There is a disadvantage that cracks may occur. Also, if the build-up thickness of porcelain is excessive, the possibility of fracture due to occlusion is increased. In addition, when the metal crown is manufactured through casting, the internal temperature of the metal rises and the physical properties of the metal may be lowered.

4 is an enlarged view of a portion A of FIG. 3 showing an angle of a chamfer surface of a custom abutment using precision machining according to a first embodiment of the present invention.

The angle CAA of the chamfer surface 122 refers to an angle formed by the horizontal plane and the chamfer surface 122, and preferably in the range of 45 to 60 degrees.

Since the appearance of the dental implant prosthesis is in a determined state, the angle CRA of the lower end of the crown is determined by the angle CAA of the chamfer surface 122.

In the case of the outer surface of the lower end of the crown, the tooth and the gum are in contact with the lower end, and the angle of this part may be closer to the vertical or conical shape narrowing toward the lower end, and the angle of the inclined surface has an angle within 15 degrees.

Therefore, in order for the angle (CRA) of the crown lower end to have an angle of about 45 degrees, the angle (CAA) of the chamfered surface 122 should be within the above range. When the lower end of the crown has an angle of about 45 degrees, it is possible to secure the area where the chamfer surface and the lower end of the crown face, and to prevent damage to the lower edge of the crown or the chamfer surface.

The connecting portion of the tapered surface 124 of the chamfered surface 122 is preferably formed in a round shape having a predetermined curvature or more.

The chamfer curvature CR, which is the curvature of the interface between the chamfered surface 122 and the taper 124, is very important in order to prevent the material from being removed due to excessive machining and the occurrence of untreated areas during the cutting process using the cutting tool.

The chamfer curvature CR is preferably 1.0 to 1.5 mm or more based on the use of a 2.0 mm diameter cutting tool. As a ratio with respect to the diameter of a cutting tool, it is preferable that it is 100 to 150% of a cutting tool radius.

If the chamfer curvature is smaller than the above range, excessive cutting may occur. If the chamfer curvature is greater than the above range, the ratio of the curved surface to the chamfer surface becomes large, resulting in a problem that the chamfer surface does not receive the load of the crown properly. .

5 is an enlarged view illustrating a taper curvature of a tapered upper surface of a custom abutment using precision machining according to a first embodiment of the present invention.

The taper curvature TR is formed at the corner where the side surface of the taper meets the upper surface. Since the crown is coupled to the taper, the curvature of the groove formed in the crown is determined according to the taper curvature.

The taper curvature TR is preferably 1.0 to 1.5 mm based on the use of a cutting tool having a diameter of 2.0 mm.

This ranges from 100% to 150% in terms of cutting tool radius.

If the taper curvature TR is smaller than the above range, an unprocessed area is generated during crown fabrication of the upper prosthesis, causing problems in adaptation, and processing efficiency is low because additional processing is required.

On the contrary, if the taper curvature TR is larger than the above range, the abutment volume may be too large or small. If the volume of the abutment becomes too large, it is difficult to have an optimal thickness of the upper prosthesis.On the contrary, if the volume of the abutment is too small, the holding force with the upper prosthesis decreases and the occlusion pressure is not sufficiently distributed. do.

6 is a view showing the main part of the custom abutment using precision machining according to the second embodiment of the present invention.

The second embodiment shows a high-end product in which the upper surface of the taper is formed in a shape corresponding to the shape of the crown outer surface, thereby improving the bonding force between the abutment and the crown and improving the load distribution effect of the abutment.

The remaining structure of the chamfered surface, the tapered side surface, and the like is the same as that of the first embodiment, and thus the duplicated description is omitted.

The second embodiment differs from the first embodiment in the upper surface of the taper.

The upper surface of the crown has an irregular curved shape corresponding to the appearance of the occlusal antagonist, and the tapered upper surface may reduce the volume of the upper crown in response to the irregular curved shape of the upper surface of the crown. It is provided.

The projections 126 are formed so as to have a minimum thickness of 0.3 mm or more although they vary depending on the crown material.

If the minimum thickness of the crown is less than 0.3 mm, the crown may be damaged by the pressure during occlusion.

The formation of the protrusions 126 is intended to reduce the volume occupied by the crown, but the protrusions 126 can not be formed in a 1: 1 shape corresponding to the irregular shape of the crown top surface.

When the projection 126 is formed on the upper surface of the taper, the inner surface of the crown should have a groove having a shape corresponding to the projection 126 formed on the upper surface of the taper. If too minute projections are formed, the crown inner surface is processed accordingly. Problems arise that are difficult to do.

Therefore, it is preferable to secure the workability of the inner surface of the crown by limiting the curvature of the protrusions formed on the tapered upper surface.

When the inner surface of the crown is machined using a cutting tool (diameter 1.0 mm tool) that is used universally, the radius of curvature TR of the preferred protrusion is preferably in the range of 0.5 to 1.0 mm. In other words, the minimum radius of curvature of the projection is preferably 100 to 200% of the radius of the cutting tool.

From the above, the abutment shape according to the present invention is summarized, and after setting the margin to the chamfer outer line, the taper and chamfer surface to have a chamfer width of 0.1 to 2 mm and a chamfer face angle of 45 to 60 degrees in the chamfer outer line. After setting the chamfer inner line which is the boundary of the taper angle, the taper angle is set in the range of 2 to 10 degrees, and the projection having the minimum radius of curvature of 0.5 mm or more corresponding to the shape of the crown upper surface is set on the upper tapered surface. The shape of can be designed.

The three-dimensional abutment shape is derived from the appearance of the final dental implant prosthesis (more specifically, the shape of the crown, the upper prosthesis). It can be produced by processing by the dimensional cutting method.

As described above, the abutment according to the present invention has a shape derived from the outer shape of the crown, thereby minimizing the volume of the crown and bringing an effect of securing the bonding force with the crown.

110: Fixtures
120: abutment
122:
122a: Chamfer outline
122b: Chamfer inner line
124: Taper
130: Crown
TA: Taper Angle
CAA: Chamfer Face Angle
CR: Chamfer Curvature
TR: Taper curvature
PR: Curvature of the projection

Claims (10)

In the method of manufacturing an abutment of a dental implant prosthesis comprising a fixture inserted into the alveolar bone, an abutment fastened to the fixture, and a crown coupled to the abutment,
The shape of the abutment is derived from the contour of the final dental implant prosthesis,
The margin of the contact line between the outer surface of the abutment and the crown of the upper prosthesis is set as the chamfer outer line, and a chamfer surface having a chamfer width of 0.1 to 2 mm and a chamfer surface angle of 45 to 60 degrees from the chamfer outer line. Abutment manufacturing method characterized in that after the setting, the taper of the shape protruding conically from the chamfer surface, and processing by a three-dimensional cutting process to the set chamfer surface and the tapered shape.
delete delete The method of claim 1,
The taper is abutment manufacturing method characterized in that the taper angle is set to have a range of 2 to 10 degrees.
The method of claim 1,
The abutment manufacturing method characterized in that the interface between the chamfer surface and the taper is formed in a curved surface of the curvature radius (CR) 1.0 ~ 1.5mm.
The method of claim 1,
The interface between the chamfer surface and the taper is formed in a curved surface, the radius of curvature CR is abutment manufacturing method, characterized in that in the range of 100 ~ 150% of the radius of the cutting tool.
The method of claim 1,
Abutment manufacturing method, characterized in that the upper surface edge of the taper is formed in a curved surface with a radius of curvature (TR) 1.0 ~ 1.5mm.
The method of claim 1,
The upper surface edge of the taper is formed in a curved surface, the radius of curvature (TR) is abutment manufacturing method, characterized in that in the range of 100 ~ 150% of the radius of the cutting tool.
The method of claim 1,
Abutment manufacturing method characterized in that the upper surface of the taper is provided with a projection to reduce the volume of the upper crown, while the minimum thickness of the crown secured 0.3mm or more.
The method of claim 1,
The abutment is abutment manufacturing method characterized in that to form a TiN coating layer on the surface.

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