KR20140012880A - Method of making denture - Google Patents

Abstract

The present invention relates to a method for manufacturing a denture, which simplifies processes for manufacturing the denture and enhances patient satisfaction by fully reflecting cranium and mandible structures of a patient. The method for manufacturing the denture of the present invention introduces three-dimensional scanning of a head part of the patient, a collateral radiation analytic technique, three dimensional CAD CAM design and output, and a processing method to the method for manufacturing the denture in order to simplify the denture manufacturing processes so that the denture manufacturing and modification can be completed in a short time. The method for manufacturing the denture comprises: setting up coordinates in order to arrange facial data, radiation data, and three dimensional plaster cast data which are basic for three dimensional design using computers; making a statistical standard model based on the coordinates using various data of the collateral radiation analytic technique and dental morphology which are widely used in orthodontics; designing complete dentures by arranging three dimensional faces of each patient and plaster cast data on the set coordinates and substituting with the standard model. [Reference numerals] (100) Set statistical standard model; (110) Arrange individual patient data; (120) Design; (130) Processing; (AA) End; (BB) Example 1

Description

Denture making method {Method of Making Denture}

The present invention relates to a method of manufacturing a dental prosthesis, and more particularly, to a method of manufacturing a complete or partial denture.

If the teeth or surrounding tissues are damaged, prosthetic treatment using artificial prosthetics will restore the function and aesthetics of the teeth. If one or more of the teeth are partially damaged, a crown covering the upper side of the damaged tooth is used as a prosthesis, but if one or more teeth are missing and missing, the teeth are placed on both sides of the teeth as if the legs are placed around the teeth. Fixed local denture connecting the missing part, that is, the bridge (Bridge) is made and treated, and if there are many missing teeth, dentures are used.

Dentures are roughly divided into local dentures (partial dentures), which are used by patients with some residual teeth, and total dentures (complete dentures) that repair teeth and absorbed gums in the absence of teeth.

Implant prosthetics has also been widely used in recent years, but dentures are still preferred in patients with high cost or elderly patients. In particular, at the time of the present application, Korea is about to apply the medical insurance to the total denture, and accordingly, the demand for the total denture is expected to increase greatly.

Looking at the conventional general denture manufacturing process based on the total denture as follows.

First, when the patient visits the dentist, a general examination of the patient and a treatment plan are established. Subsequently, the impression material is taken from the dentist by using the impression material, and a plaster diagnosis model is manufactured based on the impression body.

When the dental gypsum diagnosis model is delivered to the laboratory, the laboratory produces a personal tray based on the diagnosis model.

The personal tray is delivered to the dentist again, and the dentist uses the personal tray to obtain the final impression again, produces a main model based on the impression body, and delivers it to the laboratory.

The laboratory manufactures the foundation from medical plastic based on the main model and delivers it to the dentist.

In the dentist's office, the patient acquires the vascular system by adjusting the height of the patient's mouth, and in the laboratory, the lead denture is made with wax, reflecting the acquired vascular relationship, the lead denture is raised on the articulator, and the artificial teeth are arranged. After making, deliver it to the dentist.

At the dentist, a denture with artificial teeth is placed in the patient's mouth and adjusted to the patient to confirm that the patient is satisfied.

If the patient is satisfied with the denture, the denture is completed by a curing process that replaces the waxed lead denture with hard acrylic resin.

However, the conventional denture manufacturing process as described above takes a lot of time because the intermediate workpiece is transferred between the dental office and the laboratory several times, and thus there is a problem that labor costs increase and productivity is lowered. On the other hand, there is a problem that the inconvenience is large because the number of visits to the dentist in large numbers. In addition, despite the manufacturing process through the above complicated process, the dentures do not accurately reflect the patient's jawbone structure, it is not in the correct position in the front and rear, right and left, or the ratio of the upper and lower teeth is incorrect, or left and right horizontal Often, patient satisfaction is low.

The present invention is to solve the above problems, to simplify the process for producing dentures, and to provide a denture manufacturing method that can increase the patient satisfaction by sufficiently reflecting the skull and jawbone structure of the patient as a technical problem.

Denture production method of the present invention for achieving the above technical problem is to introduce a three-dimensional scanning, side-radiation analysis technique, and three-dimensional CAD cam design, output and processing method of the patient head, denture manufacturing process greatly simplified This enables denture fabrication and modification in a short time.

First, we set up the coordinates to align the 3D data of the plaster model and the face data, the radiation data that are the basis for the 3D design using a computer, and use the lateral radiation analysis method and various data of tooth morphology, which are widely used in orthodontics. By making the statistical standard model based on the above coordinates, the individual patient's 3D face and gypsum model data are aligned to the set coordinates, and the standard model is substituted to design the total denture.

Specifically, in manufacturing dentures according to the present invention, first, a statistical standard model for the human head is set. Subsequently, the patient's three-dimensional face scan data and skull shape obtained through lateral radiography are aligned with the statistical standard model. Next, the denture of the patient is designed by reflecting the statistical standard model, and then the designed denture is processed.

According to the present invention, the process for producing denture is simplified, and the completed denture sufficiently reflects the skull and jawbone structure of the patient, thereby increasing the functionality and increasing patient satisfaction.

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In the figure,
1 is a flow chart schematically showing the overall process of the denture manufacturing method according to the present invention;
2 and 3 are screen shots illustrating coordinate system settings in a preferred embodiment of the present invention;
4 through 6 are screen screenshots illustrating aligning the statistical standard with a set coordinate;
7-12 are screen shots illustrating the state in which individual teeth are aligned in a statistical standard model;
12A is a photograph showing an example of a marker used in a data acquisition process for an individual patient;
12B is a screen screenshot showing an example of a face three-dimensional image for a usual expression;
12C is a screen screenshot showing an example of a marker face three-dimensional image;
12D is a screen shot showing an example of an image in which a 3D image of a face with a marker is aligned with a gum plaster model;
FIG. 13 is a screen screenshot illustrating a process of scanning a face in three dimensions and aligning by moving to a set coordinate system; FIG.
14 to 18 are screen shots illustrating the process of aligning the skull analysis model and occlusal plane model and the standard individual tooth model of the statistical standard model to the aligned face data;
19 to 21 are screen screenshots illustrating a process of setting three-dimensional coordinates in face data;
19 to 21 are screen screenshots illustrating a process of setting three-dimensional coordinates in face data;
22 and 23 are screen shots illustrating the process of positioning a standard tooth in three-dimensional coordinates;
24 is a screen screenshot illustrating the process of placing a denture resin tooth in a standard tooth position;
25 and 26 are screen shots illustrating the process of designing the gums connecting the resin and the scanned plaster model;
27 is a screen shot showing the appearance of a completed denture;
28 is a flow chart showing one embodiment of a method of processing a designed denture; And
29 is a flow chart showing another embodiment of a method of processing a designed denture.

Whole process

Referring to FIG. 1, first, coordinates and a statistical standard model are set (step 100). Here, the statistical standard model is a model of anthropologically and anatomically confirmed skull shapes and structures, and combines the standard skull model with the standard location, size, and direction of the jawbone and each individual tooth in three dimensions.

Subsequently, the 3D face scan data of the individual patient and the skull shape obtained through lateral radiography are aligned with the statistical standard model constructed in step 100 (step 110). In the alignment process, the image is rotated, moved, and scaled.

Next, the denture of the patient is designed by reflecting the statistical standard model (step 120).

Finally, the designed denture is processed (step 130).

Setting up coordinates and statistical standard models

Step 111: Set the rotation center (X axis) of the mandibular joint and the line (Y axis) connecting the center point and the ANS (see FIGS. 2 and 3). A general articulator sets coordinates based on a nasion and an ear canal, but in the present invention, sets a coordinate reference for referring to radiographic images and face 3D data.

Step 112: Align the statistical standard model to the set coordinates (see FIGS. 4 to 6).

Step 113: Align the position of the individual teeth with the statistical standard model (see FIGS. 7 to 12). The standard tooth model aligns with the conventional anatomical model of each tooth and reflects the curves of curve of Spee and curve of Wilson.

In a preferred embodiment, the statistical standard model is provided in a variety of races, sexes, ages (ie, ages), and can be continuously updated and reinforced. In addition, apart from the statistical standard model, previously acquired head models for each patient may be additionally accumulated and used.

Meanwhile, in order to simplify the design process, it is preferable to prepare ready-made resin library data and images for all types of ready-made resin sets sold by a plurality of ready-made resin manufacturers, apart from the statistical standard model.

Individual patient data acquisition and sorting

Step 121: A 3D scan of a face and a side radiographic image of the patient visited the hospital. In addition, a plaster model for the patient's gums is fabricated and scanned in three dimensions.

In producing a three-dimensional image of the gum, first, an impression material is applied to the gum and palate to obtain an impression. At this time, the impression may be taken separately for the upper and lower gums, but at the same time, it is preferable to obtain them. After a certain period of time, the impression body is separated from the gums and palate in the oral cavity. In the impression body, the gum structure of the patient is engraved negatively. An oral gypsum model is formed on the impression body using a coagulant, that is, gypsum, and then three-dimensional scanning is performed.

Meanwhile, in the preferred embodiment, in step 121, both the face 3D image and the side radiographic image are acquired, but in another embodiment, only one of them may be obtained and used. In this case, it is preferable to use the face 3D image rather than the side radiation image. In another embodiment, a CT image or an MRI image may be obtained and used instead of the face 3D image and the side radiation image or instead of the side radiation image.

In a preferred embodiment, in step 122 below, in order to easily align the face 3D image, the side radiography image, and the gum 3D image, a marker is used in the process of securing the above images. In one embodiment, the marker is a tray used to obtain an impression for producing a plaster model, as shown in Figure 12a, in particular, a portion of the tray (eg, handle) is exposed to the outside during the impression acquisition process Is used. At this time, the handle of the tray acts as a marker. In another embodiment, the marker may be one or more three-dimensional objects that can be temporarily attached to the palate or the like in the oral cavity, for example, by tape, and can be recognized in the side radiographic image or CT image. The oral attachment solid marker may be, for example, a polyhedron such as a tetrahedron or a low height pyramid, or may have a spherical shape. In another embodiment, it may be a three-dimensional object having a regularly standardized shape and attachable in the oral cavity by a temporary adhesive or a screw.

The process of acquiring image data of an individual patient will be described in detail.

First, before applying a marker to a patient's mouth, a natural facial expression is taken beforehand, and then the face is scanned with a 3D scanner to obtain a face 3D image. 12B shows an example of a face 3D image for a normal facial expression. In this state, the side radiographic image may be additionally acquired. In addition, in order to check the smile line of the patient, the patient may smile and then additionally obtain a face 3D image of the smiling expression.

Subsequently, an impression material is placed on the palate of the patient, and the impression material is applied to the tray shown in FIG. 12A, for example, so that the patient bites into the mouth to raise the palate and the upper and lower gums. After sufficient time has elapsed for the impression material to solidify, prior to separating the impression body, the patient's face is scanned with a three-dimensional scanner to obtain a marker-face three-dimensional image. 12C shows an example of a three-dimensional image with a marker face. In this state, the side radiographic image may be additionally acquired.

Then, the tray to which the impression body is coupled is separated from the gum, and the impression body attached to the palate is carefully removed. Accordingly, the impression structure coupled to the tray is reflected in the gum structure and palate of the patient intaglio. The impression model is used to make a plaster model, and then three-dimensional scanning to generate a three-dimensional image of the gum.

In operation 122, the head image and the gum plaster model 3D image are moved and aligned in a set coordinate system (see FIG. 13). Here, as the head image used for alignment, one or both of a face 3D image and a side radiographic image may be used, or a CT image may be used. For example, an image combining a face 3D image and a gum plaster model 3D image is illustrated in FIG. 12D.

In step 123, the skull analysis model, the occlusal plane model, and the standard individual tooth model of the statistical standard model may be aligned and referred to the sorted face data (see FIGS. 14 to 18).

Step 123: Using the three-dimensional data of the face in the data collection process, the radiation data before the loss of teeth (or data taken with the auxiliary tool bite) and the plaster model data, based on the height relationship of the occlusal plane and the front-rear relation setting Can do it. Through the three-dimensional simulation process of the newly established individual tooth position, the patient's needs can be previewed through the axis, size, rotation, and movement of the tooth, and the model printed on the 3D printer can be previewed. You can also compare.

Denture design

Step 131: Three-dimensional coordinates are set in the face data (see FIGS. 19 to 21).

Step 132: The standard tooth is positioned in the 3D coordinates (see FIGS. 22 and 23).

Step 133: Select a ready-made resin library close to a standard tooth suitable for a patient among a plurality of ready-made resin libraries, and place an image of the ready-made resin set of the library at the standard tooth position (see FIG. 24).

Step 134: Based on the gum plaster model image, a gum connecting the resin and the scanned plaster model is designed (see FIGS. 25 and 26). 27 shows the shape of the denture after the design is completed.

The designed denture includes a gum base portion and a number of resin teeth. The gum base portion is provided with a resin seating portion for accommodating an end portion of the resin tooth. In consideration of the denture processing method, the resin seating portion may be made slightly larger, and the inner surface of the gum base portion may be made to be pushed to the outer side so that a slight play (eg, 0.5 mm) occurs from the actual gum. In the case of the upper denture, the gum base portion is formed by integrally extending the palate area to be in close contact with the palate of the patient.

Denture processing

When the design is completed, the gum base part except the resin, that is, the denture wings are manufactured, and the final dentures are finally completed by combining the ready-made resin values.

In one embodiment, only the gum base portion is separately processed, and then a ready-made resin is inserted, and the gum base portion is precisely modified through a functional increase, that is, a precision impression process, and then the final denture is completed through a resin polymerization process. At this time, the ready-made resin value is selected to be similar in size to the designed resin value. Processing of only the gum base portion is preferably performed by Rapid Prototyping (RP) using a material soluble in a solvent that is harmless to the human body.

In processing the gum base by the RP technique, for the purpose of functional improvement, the inner surface of the gum base is moved to the outer side so that a slight play (eg 0.5 mm) occurs with the actual gum, that is, the inner surface of the gum base is made. It is desirable to design the cavity so that the cavity is slightly larger. In addition, the area where the resin is seated on the gum base may be designed to be slightly larger to allow a slight position / direction change during the oral application in a state where the ready-made resin is seated by wax.

Accordingly, the thickness of the gum region and the resin direction direction can be corrected before and after the intraoral poetic.

On the other hand, in another embodiment, after processing the gum base portion by machining, the resin tooth may be bonded to the processed gum base portion.

This will be described in detail with reference to FIGS. 28 and 29.

28 shows one embodiment of a method of processing a designed denture.

First, a gum base part, that is, denture wings are manufactured (step 500). Denture wings are preferably machined by an RP apparatus, but are not limited thereto, and may be machined by, for example, a numerically controlled milling machine.

As mentioned above, denture wings can be processed using materials that are soluble in solvents that are harmless to the human body. One example of such a material is wax. The denture wings are formed with a resin seating portion for accommodating a portion of the resin tooth, and it is preferable to make the seating portion slightly larger than the resin tooth that is actually seated. In addition, it is preferable that the inner surface of the denture wing is pushed to the outer surface side so that a slight play (for example, 0.5 mm) is generated from the actual gum.

When fabrication of the denture wings is completed, wax is applied to the resin seating portion, and then the resin is settled to temporarily attach the resin tooth to the denture wing (step 502). As a result, the approximate shape of the denture is completed, which is transmitted to the dental hospital.

In the dental clinic, in the denture model as described above, the precision impression material is applied to the inner surface of the denture wings and then tried on the patient's mouth to perform a precise impression. At this time, the input amount of the precision impression material is determined in consideration of the play between the inner surface of the denture wing and the actual gum. In operation 504, the position and direction of each resin value are finely corrected with reference to the patient's opinion.

Finally, the denture model, which has been finely corrected, is transferred back to a laboratory such as a laboratory or a design center, and a resin polymerization process is performed on the denture wings to complete the denture, that is, the denture (step 506).

In performing the polymerization process, first, a mold surrounding the denture is manufactured, and then, the wax is dissolved in hot water, and then the wax is completely removed and the precision impression material is torn off. Then, after the upper and lower molds are combined again, the resin is boiled for 5-7 hours in 150 degree water while compressing the resin into the mold space in which the wax is dissolved.

29 shows another embodiment of a method of processing a designed denture.

According to the present embodiment, the denture blade is directly machined by the CAM method, and the resin is coupled to the denture blade via a rigid support frame.

First, the denture blade is processed by cutting the resin by, for example, a numerically controlled milling machine (step 520). At this time, the denture wing is processed to be provided with a support frame receiving groove for accommodating the support frame.

Subsequently, a screw hole is formed in each resin tooth, or the resin holes in which the screw hole is formed are provided (operation 522).

Next, the support frame and the resin teeth are joined by screws (operation 524). At this time, an adhesive may be used instead of the screw.

Then, the denture blade and the support frame are coupled by screws (step 526).

Finally, the support frame is surface-coated in the same color as the gum, and the screwing portion of the denture blade is filled (step 528).

In the present embodiment, the support frame receiving groove may be made on the inner surface, not on the outer surface of the denture blade.

In conclusion, according to the present invention, the denture manufacturing method using a computer can determine the horizontal relationship between the upper and lower positions of the occlusal plane in consideration of the face data and the radiocranial skull, and the manufacturing process, the period, and the shortening are possible. If precise processing and output are made, it is possible to install the denture on the second visit after 2-3 days. Of course, it can be slightly modified to be a useful method for making surgical stents and temporary cr-bridges.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

For example, although the embodiment of the present invention has been described with reference to the complete denture, the present invention is not limited thereto, and may be used for making partial dentures.

Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (8)

(a) establishing a statistical standard model for the human head;
(b) obtaining a head image and a gum model image of the patient;
(c) aligning the head image with the gum model image;
Aligning the 3D face scan data of the patient and the skull shape obtained through lateral radiography with the statistical standard model; And
(c) designing the denture of the patient by reflecting the statistical standard model;
Denture design method comprising a. The method of claim 1, wherein the head image is
A denture design method, which is any one selected from a three-dimensional face scan image, lateral radiation, and combinations thereof. The method of claim 1, wherein the head image is a CT image. The method according to claim 1, wherein step (a)
Preparing a plurality of ready-made resin library images;
Including;
In step (c)
Denture design method for designing the denture with reference to the library image. (a) establishing a statistical standard model for the human head;
(b) obtaining a head image and a gum model image of the patient;
(c) aligning the head image with the gum model image;
Aligning the 3D face scan data of the patient and the skull shape obtained through lateral radiography with the statistical standard model;
(c) designing the denture of the patient by reflecting the statistical standard model; And
(d) processing the designed dentures;
Denture production method comprising a. The method according to claim 5, wherein the head image
Denture manufacturing method which is any one selected from the three-dimensional face scan image, side radiation, and combinations thereof. The method of claim 5, wherein the head image is a CT image. The method of claim 5, wherein step (a)
Preparing a plurality of ready-made resin library images;
Including;
In step (c)
Denture manufacturing method for designing the denture with reference to the library image.

Images