KR20170103514A

KR20170103514A - Manufacturing method of customized dental implant using computer aided design and computer aided manufactuirng

Info

Publication number: KR20170103514A
Application number: KR1020160026517A
Authority: KR
Inventors: 김태환
Original assignee: 김태환
Priority date: 2016-03-04
Filing date: 2016-03-04
Publication date: 2017-09-13

Abstract

And more particularly, to a method of manufacturing a custom dental implant prosthesis using a CAD cam capable of collectively designing and manufacturing crown and abutment using a CAD cam.
A method for manufacturing a dental implant prosthesis using a camcam, the method comprising: acquiring three-dimensional shape data of an oral environment and displaying the three-dimensional shape data on a CAD system; and acquiring three-dimensional shape data of a dental implant prosthesis from a wax- Dimensional shape data of the crown and the periphery, wherein the inner shape of the crown is determined depending on the shape of the abutment surface and the shape of the post, and the derived crown and the abutment 3 Wherein the crown and the abutment are manufactured through machining using the 3D shape data.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a dental implant prosthesis using a CAD-CAM, and more particularly to a method of manufacturing a dental implant prosthesis using a CAD-

Implant

Generally, an implant implies a replacement that restores the original tissue when it is lost, but it refers to placing an artificial tooth substitute in a dentist. 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 the case of general prosthesis or dentures, the surrounding teeth and bones are damaged after a while, but the dental implant prosthesis does not injure the surrounding dental tissue, and since it has the same function and shape as the natural teeth and does not have cavities, it can be used semi-permanently .

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 helps to stabilize the dentition as well as to disperse the excessive stress applied to the surrounding supporting bone tissue.

Thus, the dental implant prosthetic treatment is divided into a gingival bone, namely, a surgical procedure for implanting a fixture on the alveolar bone, and a prosthetic procedure for attaching the tooth replacement to the implanted fixture by connecting the abutment.

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 includes a fixture level fixture for completing the model in the oral cavity by connecting impression copings in the oral cavity when the impression is made during the prosthesis process

Impression method.

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. And a healing abutment is fastened to the top of the fixture for aesthetic gingival formation and waited for two to three weeks. In order to improve the complexity of such a second procedure, a first-aid procedure for fastening the healing abutment is omitted by omitting the process of fastening and removing the cover screw.

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

Thereafter, a tooth model is manufactured, an artificial tooth is machined, an abutment is fastened to the top of the fixture, and an upper prosthesis (i.e., a crown) is fixed on the abutment to complete the implant prosthesis.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of designing and fabricating crown and abutment of a dental implant prosthesis using a CAD cam.

Another object of the present invention is to design and manufacture crown and abutment of dental implant prosthesis collectively so as to reduce the time required for designing and manufacturing and to improve the bonding property of crown and abutment.

A method for manufacturing a dental implant prosthesis using a camcam, the method comprising: acquiring three-dimensional shape data of an oral environment and displaying the three-dimensional shape data on a CAD system; and acquiring three-dimensional shape data of a dental implant prosthesis from a wax- Dimensional shape data of the crown and the periphery, wherein the inner shape of the crown is determined depending on the shape of the abutment surface and the shape of the post, and the derived crown and the abutment 3 Wherein the crown and the abutment are manufactured through machining by using the 3D shape data of the dental implant prosthesis.

The width of the abutment surface of the abutment is preferably 0.6 mm or more, and the maximum angle of the chamfering surface is preferably 63 degrees or less.

The post angle of the post is preferably 14 degrees or less, and the post has a tapered shape in which the cross-sectional area becomes narrower toward the upper part, and the taper angle is more preferably 4 degrees or more.

Further, it is preferable that the outer line of the chamfer surface forms a margin, and the height deviation of the margin is 1.0 mm or less. The boundary between the chamfer surface and the post is preferably round-processed with a curvature of 1R or more.

Particularly, when the abutment three-dimensional shape data is processed to derive the shape of the abutment, the maximum value of the angle of the chamfer surface, the minimum value of the width of the chamfer surface, and the machining width in the range where the post angle of the post does not deviate from the preset numerical range It is possible to reduce the effort required for the design.

According to the present invention, the abutment and the crown of the dental implant prosthesis can be designed and manufactured collectively using a CAD cam, thereby reducing the treatment time.

According to the present invention, the abutment shape that is individually manufactured according to the tooth shape is limited within a certain range, thereby reducing the time and effort required for the abutment shape design, thereby improving the productivity and reducing the cost.

In addition, the abutment shape limitation of the present invention reduces the occurrence of machining errors during machining by the cutting equipment, and provides an effect that the abutment and the crown can have optimal bonding force.

The dental implant prosthesis includes a fixture to be inserted into the alveolar bone, an abutment to be fastened to the fixture, and a crown surrounding the abutment and forming an external shape of the final dental implant prosthesis.

The crown may be made of a noble metal or a semi-precious metal alloy that does not contain gold, a ceramic material, or a precious metal, a non-precious metal, or a semi-precious metal alloy, It can be manufactured using various dental materials such as using precious metal and ceramics together.

The external shape of the crown is determined using the shape of the extracted teeth of the patient, the shape of the mating confronting teeth, and the like. And the inner shape of the crown is made to correspond to the outer shape of the zone.

The present invention proposes two types of a configuration in which the abutment upper portion is formed flat and a configuration in which the upper abutment portion is formed to correspond to the crown contour.

When the abutment upper portion is formed flat, it is possible to reduce the processing cost, the processing time, the design time, and the post-processing time, and it is possible to manufacture the entry-level product at a relatively low cost, In addition,

When the upper portion of the abutment is formed to correspond to the crown shape (final tooth shape), the cost and time for the abutment and crown are increased, while the effect of the load distribution of the abutment is maximized.

The combination of the crown and the abutment is combined by the fitting by the shape and the adhesive force by the adhesive or the like. However, as described above, the crown is made of metal or ceramics including noble metals, and the larger the volume of the crown is, the more the processing cost and the cost are increased.

The present invention provides a method for manufacturing a dental implant prosthesis using a CAD cam, which can improve the degree of crown and abutment bonding and reduce the time required for manufacturing an implant prosthesis, .

To this end, the present invention relates to a method for acquiring three-dimensional shape data of a patient's oral environment, displaying the same on a CAD system, preparing a wax-up model in consideration of the shape of an occlusal tooth and an occlusal tooth, Three-dimensional shape data is acquired. Then, three-dimensional shape data of the patient's oral environment and three-dimensional shape data of the final prosthesis are processed to derive three-dimensional shape data of crown and abdomen.

At this time, it is preferable that the inner shape of the crown is determined depending on the chamfer surface and the post shape of the abutment. The three-dimensional shape data and the three-dimensional shape data of the crown thus derived are converted into data for a computer aided manufacturing process so that the crown and the abutment are manufactured through machining.

The present invention is characterized in that, in the method of manufacturing an implant prosthesis for dental use, there are some limitations in deriving abutment and crown shapes.

Some of the limitations here are that the implant prosthesis can perform its function and it is the minimum design requirement required for ensuring durability and durability.

The abutment has a portion inserted into the gum and a portion projecting to the outside of the gum, and the portion protruding to the outside of the gum is wrapped in the crown.

The portion of the abutment which is inserted into the inside of the gum has a shape corresponding to the gum, and has a shape to be fastened to the fixture. The portion of the abutment protruding from the abdomen to the outside of the gum should be easily joined to the crown and securely connected.

When the dental implant prosthesis of the same shape is manufactured, the volume of the crown is decreased when the abutment volume is increased. On the contrary, when the abutment volume is decreased, the volume of the crown is increased. And workability. Therefore, it is better to increase the volume of the abutting zone as much as possible. In addition, because the zone stock has a relatively higher strength than the crown, it is advantageous in terms of strength and durability in the case of fabricating the zone volume in accordance with the crown shape and the minimum thickness capable of normal functioning.

The abutment surface includes an annular chamfered surface to be in contact with the lower end surface of the crown, and a conically protruded post from the inside of the chamfered surface. Here, the term "annular" means a closed curve shape that is wider than a circular shape and an elliptical shape.

The chamfer surface is an annular curved surface defined by the chamfer outer line and the chamfer inner line.

The outer chamfer line is a linear portion generated by contact between the outer surface of the abutment and the crown, which is an upper prosthesis, and is referred to as a margin.

Margins can be located above or below the hypothetical line relative to the connected hypothetical line, with the highest points of the surrounding gum around the dental implant replacement, and the approximate location of the margin is determined by the dentist's baseline It may be ordered a few millimeters below or a few millimeters above.

The chamfered surface is preferably spliced to the lower end surface of the crown and has a certain range of width and a certain angle.

The width of the chamfered surface is preferably 0.6 mm or more. In other words, the width of the chamfer surface is preferably at least 0.6 mm or more. It is also preferable that the maximum angle of the chamfer surface is 63 degrees or less.

When the width and angle of the chamfer surface are out of the above-mentioned limit range, it is difficult to secure the bonding strength between the crown and the abutment. The post has a tapered shape with a narrow cross-sectional area as it goes to the top, in order to facilitate the crown and tie-join, since the crown is fitted in a manner to be fitted down from the abutment.

The angle formed by the central axis of the post and the side surface of the post is referred to as a taper angle, and the taper angle is preferably in the range of 4 to 10 degrees.

If the taper angle is less than 4 degrees, an excessive force is required to insert the crown or a problem that the crown is not completely inserted increases. When the taper angle exceeds 10 degrees, the volume occupied by the crown becomes large , The cost is increased unnecessarily, and the coupling force with the crown is lowered.

Further, it is preferable that the post angle which is the angle formed by the center axis of the post with the screw is 14 degrees or less. If the post angle exceeds the above range, the occlusion pressure may not be properly transmitted to the fixture, which may cause durability problems.

The width and the thickness of the chamfered surface divided by the chamfer outer line and the chamfer inner line are important parameters. The chamfer surface is a part that receives the load from the crown and disperses it, which is a part that greatly affects the durability. The width of the chamfer surface means the horizontal distance between the chamfer outer line and the chamfer inner line, and the thickness of the lower end of the crown is determined by the width of the chamfer surface.

The angle of the chamfer surface means the angle between the horizontal surface and the chamfer surface, and it is preferable that the maximum angle is 63 degrees or less.

It is preferable that the connecting portion of the chamfer surface and the post is formed into a round shape having a certain curvature or more. The curvature of the interface between the chamfer surface and the post is referred to as chamfer curvature. Setting the chamfer curvature is very important in order to prevent material from being removed due to excessive machining and occurrence of untreated areas during cutting using a cutting tool.

The chamfer curvature is preferably 1.0 to 1.5 mm or more based on the use of a 2.0 mm diameter cutting tool. In view of the ratio to the diameter of the cutting tool, it is desirable that the radius is in the range of 100% to 150% of the cutting tool radius.

If the chamfer curvature is smaller than the above range, excessive cutting may occur. If the chamfer curvature is larger than the above range, the ratio of the chamfer surface to the chamfer surface increases, and the chamfer surface can not receive the load of the crown properly .

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

The post curvature is preferably 1.0 to 1.5 mm based on the use of a 2.0 mm diameter cutting tool. It ranges from 100 to 150% in terms of the ratio to the cutting tool radius.

If the post curvature is smaller than the above range, an unprocessed area is generated in the crown manufacturing process of the upper prosthesis, thereby causing problems with the adaptation, and the processing efficiency is lowered because further processing is required.

On the other hand, if the post curvature is larger than the above range, the abutment volume may become too large or small. If the volume of the abutment is too large, it is difficult to obtain the optimal thickness of the upper prosthesis. On the contrary, if the volume of the abutment is too small, the retention force with the upper prosthesis drops and the occlusion pressure is not sufficiently dispersed.

From the above, the abutment shape according to the present invention can be summarized as follows. After the margin is set to the chamfer outer line so that the height deviation is 1.0 mm or less, the chamfer width of 0.6 mm or more and the chamfer surface angle of 63 degrees or less After setting the inside line of the chamfer which is the boundary between the taper and the chamfer surface, the post angle of the post should be 14 degrees or less, and the taper angle of the post may be set in the range of 4 to 10 degrees to design a three- .

As described above, according to the present invention, it is possible to minimize the volume of the crown and secure the bonding force with the crown by having the shape derived from the outer shape of the crown.

Claims

A method of manufacturing a dental implant prosthesis using a CAD cam, the method comprising:
Dimensional shape data of a dental implant prosthesis is acquired from a wax-up model, and these data are processed to derive three-dimensional shape data of crown and abdomen, Characterized in that the inner surface shape of the crown is determined depending on the chamfer surface and the post shape of the abutment and that the crown and the abutment are manufactured through machining using the derived crown and the abutment three- Of the implant.

2. The method according to claim 1, wherein the width of the chamfered surface of the base is 0.6 mm or more, and the maximum angle of the base chamfered surface is 63 degrees or less.

The method according to claim 1, wherein the post angle of the post is 14 degrees or less.

The method according to claim 3, wherein the base post has a tapered shape with a smaller cross-sectional area, and the taper angle is greater than 4 degrees.

2. The method according to claim 1, wherein the outline of the base chamfer surface forms a margin, and the height deviation of the margin is 1.0 mm or less.

2. The method according to claim 1, wherein the boundary between the base chamfer surface and the post is rounded with a curvature of at least 1R.

When the abutment three-dimensional shape data is processed to derive the abutment shape,
Wherein the machining is performed in a range in which the maximum angle of the chamfer surface, the minimum value of the chamfer surface, and the post angle of the post do not deviate from a preset numerical range.