JP6454627B2 - Method for designing denture, method for producing denture, positioning means - Google Patents

Description

  The present invention relates to a plate denture, and more particularly to a design method and a manufacturing method of a plate denture, and a positioning means used when manufacturing a plate denture.

One of the well-known methods for producing a denture is a lost wax method. This can be obtained through a process as follows to obtain a denture. In other words, an impression material is first used to take a shape of the shape in the patient's mouth (so-called impression taking). Gypsum is poured and hardened to make a plaster model.
Next, the height of the upper and lower jaw dentures is secured on the plaster model using wax, and artificial teeth are embedded in the wax to form wax dentures (so-called artificial tooth arrangement). Thereafter, the wax denture is buried in gypsum and hardened, and a portion where the wax flows out is formed, and then the wax is melted away using hot water or the like. As a result, only the arranged artificial teeth remain, and a cavity is formed in the portion where the wax was present, so that resin or the like is introduced (filled) therein to be hardened. Then, the denture can be obtained by cracking and removing the plaster.

  As described above, the lost wax method has many steps and takes time to complete, and the skill of a dental technician is required for its production.

On the other hand, Patent Documents 1 and 2 disclose a technique for producing a dental prosthesis such as a plate denture using CAD / CAM. That is, a dental prosthesis can be obtained by using CAD / CAM to handle from the design to the manufacture of a dental prosthesis as data, and finally cutting out with an NC machine tool based on the data.
According to this, there are few processes compared with the lost wax method, and it is possible to manufacture a dental prosthesis in a shorter period of time than before.

JP-A-9-206320 JP 2002-224143 A

  However, when preparing a denture using CAD / CAM, the denture base is cut out with a hard resin material compared with wax, and artificial teeth formed on the hard denture base are inserted. Artificial teeth such as ceramics and resin were fitted in the recesses and arranged, and fixed with an adhesive. Then, since it is necessary to form the hollow for fitting the artificial tooth larger than the artificial tooth, a shift occurs with respect to the position designed when the artificial tooth is actually arranged, and the overall occlusal relationship designed on the CAD is obtained. There was a risk of causing it to go crazy. Thus, since positioning of an artificial tooth is important, a technique for easily and accurately attaching an artificial tooth is required.

  Therefore, the present invention provides a method for designing a denture that can easily and accurately attach an artificial tooth to a denture base when arranging the artificial teeth on a denture base designed and formed by CAD / CAM. The task is to do. Moreover, the manufacturing method of a base denture and the positioning means used when manufacturing a base denture are provided.

  The present invention will be described below. Here, for easy understanding, reference numerals attached to the specification and drawings are described in parentheses, but the present invention is not limited to this.

The invention according to claim 1 is a method for designing a denture (10) on a computer based on intraoral shape data , and the denture base (20) shape data based on the intraoral shape data. In the process of creating the shape data of the upper and lower jaw artificial teeth (30) arranged in the denture base shape data (S23), and in the arranged shape data of the upper and lower jaw artificial teeth corresponding to the shape of the occlusal surface, the process of creating the shape data of the upper and lower jaws of the occlusal relationships plate-shaped bite plate having a recess which is transferred the occlusal surface of the shape data of the artificial tooth (40) (S24), A method for designing a denture base (S20), including a step of creating data of positioning means for fixing the positions of the shape data of the denture base and the shape data of the occlusal plate .

The invention according to claim 2 is a manufacturing method (S1) of the denture (110), and a process (S20) of designing the denture (10) by the design method according to claim 1 , The process of producing the denture base (120), artificial tooth (130), occlusal plate (140), and positioning means (150, 160, 170) based on the above, and the process of arranging the artificial tooth produced on the produced occlusal plate (S32) and a step (S33) of placing the artificial tooth placed on the occlusal plate on the denture base, and in the step of placing the artificial tooth on the denture base, the positioning means positions the denture base and the occlusal plate. It is a manufacturing method of a plate denture whose relationship is determined.

Invention of Claim 3 is a positioning means (150) used when manufacturing a denture base (110), Comprising: The denture base (120) and the occlusal surface of the upper and lower jaw artificial teeth (130) . It is a positioning means for preparing a denture, which is a means for connecting an occlusal plate (140) having a concave portion to which the occlusal relationship of the occlusal surfaces of upper and lower jaw artificial teeth corresponding to the shape is transferred .

Invention of Claim 4 is a positioning means (160) used when manufacturing a denture base (110), Comprising: The denture base holding member holding the attitude | position of a denture base, and artificial teeth ( upper and lower jaw) ( 130) an occlusal plate (140) corresponding to the shape of the occlusal surface of the upper and lower jaws and corresponding to the shape of the occlusal surface of the upper and lower jaws, and a coupling member connected to the denture base holding member; It is a positioning means for preparing a denture with a base.

  ADVANTAGE OF THE INVENTION According to this invention, an artificial tooth can be attached to a denture base designed and formed by CAD / CAM accurately and easily.

It is a figure showing the flow of manufacturing method S1 of a denture. It is a figure showing the flow of process S20 of the design of a denture. It is a figure showing the flow of process S30 of preparation of a base denture. 1 is an external view of a denture base 20. FIG. FIG. 5A is an external view of the artificial tooth 30, and FIG. 5B is a cross-sectional view of the artificial tooth 30. It is a figure showing the external appearance of the plate denture. FIG. 7A is a perspective view illustrating the occlusal plate 40, and FIG. 7B is a conceptual diagram illustrating the occlusal plate 40. 3 is a perspective view of an occlusal plate 40. FIG. FIG. 9A is a view for explaining the positioning means 50, and FIG. 9B is a view in which the positioning means 50 is separated. 4 is an exploded perspective view of positioning means 60. FIG. It is the figure where the positioning means 60 was combined. It is a figure explaining the positioning means. It is a figure explaining artificial tooth arrangement | positioning S32 to an occlusion plate. It is a figure explaining artificial tooth arrangement | positioning S33 to a denture base. It is a figure explaining artificial tooth arrangement | positioning S33 to a denture base. It is a figure explaining artificial tooth arrangement | positioning S33 to a denture base.

  The present invention will be described below with reference to the drawings. However, the present invention is not limited to these forms.

  FIG. 1 is a diagram illustrating one embodiment, and is a diagram illustrating a flow of a manufacturing method S1 for a plate denture. As can be seen from this, the method S1 for producing a denture includes a data S10 for intraoral shape, a design S20 for a denture, and a creation S30 for a denture. Each process will be described below.

In the intraoral shape data conversion S10, three-dimensional data of the intraoral shape is acquired indirectly from the obtained impression or directly from the oral cavity. In order to acquire the data from the impression, a method of three-dimensionally measuring a gypsum model obtained by taking an impression by a known method can be used. In order to acquire the data directly from the oral cavity, an intraoral three-dimensional scanner can be used.
Thereby, the intraoral shape such as the shape information of the mucous membrane surface of the patient is converted into data. At this time, the occlusal data can be obtained by, for example, combining the impression body of the upper jaw and the impression body of the lower jaw in the same manner as the position of the patient's jaw and performing three-dimensional measurement.

In the floor denture design S20, the shape of the floor denture is designed and determined on the computer based on the data obtained in the intraoral shape data S10. FIG. 2 shows the flow of the denture design S20. As can be seen, the denture design S20 includes intraoral data acquisition S21, denture base design S22, artificial tooth arrangement design S23, occlusal plate design S24, and positioning means design S25. .
It should be noted that all of the plate denture 10, the denture base 20, the artificial tooth 30, the occlusal plate 40, and the positioning means 50, 60, and 70 described in the design S20 of the plate denture are formed by data on a computer. Means.

  The intraoral data acquisition S21 is a step of acquiring information related to the intraoral shape that has been converted into data in the intraoral shape data S10 and taking it into the design apparatus (computer). The fetch is recorded in a storage device of the computer via receiving means provided in the computer.

In the denture base design S22, the information obtained in the intraoral data acquisition S21 is changed as necessary, and the shape of the denture base 20 is designed. FIG 4, showing the denture base 20 of the upper jaw side schematically. Although the denture base on the lower jaw also has a vertical difference, the basic configuration can be considered in the same way. Either one may be produced, or both may be produced.
The denture base is a member having a function of holding the artificial tooth in a predetermined position and stably mounting the denture itself on the oral mucosa. Therefore, as can be seen from FIG. 4, the denture base 20 is finally provided with a bank-shaped ridge portion 21 as a portion where the artificial teeth 30 are arranged, and one end of the artificial tooth 30 is formed on the top of the bank portion 21. It is inserted and the form provided with the recessed part 22 to which the artificial tooth 30 is fixed is provided. However, since the position and shape of the recess 22 are determined by the artificial tooth 30 to be arranged, the form of the recess 22 is determined after the next artificial tooth arrangement design S23.
Such a denture base 20 can be designed using a known method.

  In the artificial tooth arrangement design S23, the artificial teeth 30 are arranged with respect to the denture base design S22. Information on artificial teeth is called from a computer database and the artificial teeth 30 are arranged in the denture base 20. That is, based on the information acquired so far, artificial tooth data corresponding to the dental arch is retrieved from the database stored in the storage means of the computer. And after arrange | positioning this to the approximate position on the ridge 21 of the denture base 20, the position is finely adjusted. After the position is determined by the fine adjustment, the above-described concave portion 22 (see FIG. 4) is formed in the denture base 20. At this time, the recess 22 has a slightly larger shape than the outer shape of the artificial tooth 30 so that the artificial tooth 30 can be easily inserted into the recess 22.

  The artificial tooth 30 is an artificial tooth that functions in place of a natural tooth and imitates a natural tooth. As shown to Fig.5 (a), the some artificial tooth 30 is arranged like a natural tooth as needed. In FIG. 5A, the upper side of the paper is the occlusal surface side, the lower side of the paper is the denture base 20 side, and the left and right sides of the paper are the arrangement direction. FIG. 5B shows a cross section of the artificial tooth 30 along the line indicated by Vb-Vb in FIG. This is a cross section in a direction orthogonal to the arrangement direction. As can be seen from FIGS. 5A and 5B, an undercut portion 31 is provided on a side surface of the artificial tooth 30 in the direction orthogonal to the arrangement direction at the end portion on the denture base 20 side. . Thereby, fixation to the denture base 20 of the artificial tooth 30 becomes stronger.

  When the artificial teeth 30 are arranged in the denture base 20, the denture base 10 is obtained as shown in FIG. That is, the artificial tooth 30 is disposed in the concave portion 22 of the denture base 20 to form the base denture 10.

  In the occlusal plate design S24, the occlusal plate 40 disposed between the occlusal surfaces of the upper and lower dentitions is designed. The occlusal plate 40 is a plate-like member to which the occlusal relationship between the occlusal surfaces of the artificial teeth of the upper and lower jaws (or artificial teeth and natural teeth) is transferred. 7 and 8 are conceptual diagrams for explanation. FIG. 7A is a conceptual diagram in which the occlusal plate 40 is disposed between the upper and lower jaw dentures 10 as viewed from an oblique direction, and FIG. 7B is a conceptual diagram as viewed from the front. FIG. 8 is a perspective view of the occlusal plate 40.

  As can be seen from FIGS. 7 (a), 7 (b) and 8, the occlusal plate 40 is an arcuate plate along the dentition, and the occlusal surfaces of the upper and lower dentitions are transferred to the front and back. ing. Therefore, the occlusal plate 40 includes information on the positional relationship between the upper and lower tooth rows in the occlusal state. That is, as can be seen from FIG. 8, the occlusion plate 40 has a recess 41 corresponding to the occlusal surface side shape of the artificial tooth 30.

  The thickness of the occlusal plate 40 is not particularly limited. However, when the actual occlusion plate 140 is produced based on the data of the occlusal plate 40 as described later, the artificial teeth 130 are formed in the recesses 141 of the occlusal plate 140. It is preferable to be configured so that can be inserted and held.

  In the positioning means design S25, a positioning means for maintaining the positional relationship of the denture base 20, the artificial tooth 30, and the occlusal plate 40 is designed. As a result, as described later, when the artificial tooth 130 is placed on the denture base 120 actually produced, it can be accurately performed (as designed) including the occlusal state.

  FIG. 9 shows a view for explaining the positioning means 50 according to the first embodiment. FIG. 9 is a view from the same viewpoint as FIG. 9A shows the posture when the positioning unit 50 is combined, and FIG. 9B shows the posture when the positioning unit 50 is separated.

  As can be seen from FIGS. 9A and 9B, the positioning means 50 includes a denture base connecting member 51, an occlusal plate connecting member 52, and a connecting member 53. Here, the denture base connecting member 51 is a member that is detachably connected to the denture base 20, and the occlusal plate connecting member 52 is a member that is detachably connected to the occlusal plate 40. The connecting member 53 is a member that connects the denture base connecting member 51 and the occlusal plate connecting member 52. In this embodiment, the joint portion 52a is provided so that connection and separation can be performed by a part of the coupling member 52.

  The connecting portion of the denture base connecting member 51 with the denture base 20, the connecting portion of the occlusal plate connecting member 52 with the occlusal plate 40, and the joint portion 52a are provided with protrusions 50a and holes 50b corresponding thereto. Misalignment during installation is prevented.

  The positioning means 50 is designed so that the denture base 20 and the artificial tooth 30 can be arranged to reproduce the patient's occlusion.

  10 and 11 are views for explaining the positioning means 60 according to the second embodiment. FIG. 10 shows a posture in which the positioning means 60 is separated, and FIG. 11 shows a posture in which the positioning means 60 is combined.

As can be seen from FIGS. 10 and 11, the positioning means 60 includes a denture base holding member 61, an occlusal plate connecting member 62, and a connecting member 63.
Here, the denture base holding member 61 is a member that maintains the denture base 20 in a predetermined posture. In addition, since FIG. 10, FIG. 11 is a figure for demonstrating the positioning means 60, the description of the held denture base 20 is abbreviate | omitted from a viewpoint of intelligibility. 10 and 11, the denture base holding member 61 is provided with a recess 61a for holding the denture base 20, so that the denture base 20 is not moved and rotated while being held by the recess 61a. ing.
The occlusal plate connecting member 62 is a part that is integrally connected to the occlusal plate 40. In this embodiment, the connecting member 63 is formed at the tip of the cross-shaped member.
The connecting member 63 is a member that connects the denture base holding member 61 and the occlusal plate connecting member 62. In this embodiment, the connecting member 63 is configured by three protrusions 63a provided at the tip of the occlusal plate connecting member 62 and a groove 63b provided in the denture base holding member 61 into which the protrusion 63a is inserted.

  According to such positioning means 60, the denture base 20 is disposed inside the concave portion 61a of the denture base holding member 61. On the other hand, as shown in FIG. 11, the protrusion 63a is inserted inside the groove 63b. By doing so, positioning of the occlusal plate 40 and the denture base 20 is performed.

  Such positioning means 60 also acts in the same way as the positioning means 50, and can implement the designed artificial tooth arrangement with high accuracy.

FIG. 12 shows a view for explaining the positioning means 70 according to the third embodiment. The positioning means 70 is an example in which positioning means is provided in at least one of the group of artificial tooth rows and the recess 22 of the denture base 20 into which the denture base 20 is inserted. In the example of FIG. 12, one prismatic projection 70 a that constitutes the positioning means 70 is arranged on the surface of the artificial tooth 30 that faces the bottom surface of the recess 22, and the bottom surface of the recess 22 corresponds to the projection 70 a. A recess 70b is provided in the shape and position. According to this, the artificial tooth 30 provided with the positioning means 70 can be arranged in the concave portion 22 (the concave portion provided with the positioning means 70) of the denture base 20 only in the designed position and orientation. Therefore, other normal artificial teeth whose positional relationship is determined by the occlusal plate can also be arranged in the concave portion 22 of the denture base 30 in the correct position and orientation following the artificial tooth 30 provided with the positioning means 70.
In addition, according to such positioning means 70, the positioning means 70 is concealed after producing the denture as a final product, so that it is not necessary to perform post-processing (for example, removal of the positioning means).

  The platen denture design S20 is completed through the above process.

Returning to FIG. 1, the preparation S30 for a plate denture will be described. FIG. 3 shows the flow of preparation S30 for a plate denture.
In the preparation of a plate denture S30, each element is actually prepared based on the data of each element designed in the plate denture design S20, and a combination of these elements is used to create a precise denture. Here, an example using the positioning means 50 will be described. As can be seen from FIG. 3, the preparation of a denture S30 includes an element production S31, an artificial tooth arrangement S32 on the occlusal plate, an artificial tooth arrangement S33 on the denture base, and an occlusal plate and positioning means removal S34. Yes.

In the element preparation S31, the shape data of the denture base 20, the shape data of the artificial tooth 30, the shape data of the occlusal plate 40, and the shape data of the positioning means 50 designed in the design of the denture base S20 are individually extracted, It is output as command data to the machine, and the shape is cut out by the machine tool that has received the machining data. This process itself can be performed by a known method, and examples include so-called CAM processing.
Thereby, an actual denture base 120 is produced from the denture base 20 as data, an actual artificial tooth 130 is produced from the artificial tooth 30 as data, and an actual occlusion plate 140 is produced from the occlusion plate 40 as data. The actual positioning means 150 (positioning means 160 (not shown) in the case of the positioning means 60, positioning means 170 (not shown) in the case of the positioning means 70) is produced from the positioning means 50 as data.

In the artificial tooth arrangement S32 on the occlusal plate, the occlusal surface side of the artificial tooth 130 is inserted into the occlusal plate 140 and arranged. This is schematically shown in FIG. Since the concave portion 141 is formed on the occlusal plate 140 based on the occlusal surface of the artificial tooth 130, the shape thereof matches that of the artificial tooth 130, so that the occlusal plate 140 can be appropriately disposed as shown in FIG. If necessary, the occlusal plate 140 and the artificial tooth 130 may be fixed with an adhesive or the like having a weak adhesive force as much as possible without shifting.
Thereby, the positional relationship including occlusion in the artificial tooth 130 becomes appropriate, and an accurate arrangement can be obtained for the design. In addition, as will be described later, the artificial teeth 130 can be arranged not only one by one, but the entire occlusal plate together with the occlusal plate, so that the artificial teeth can be efficiently arranged while maintaining accuracy. is there.

  In the artificial tooth placement S <b> 33 on the denture base, the artificial tooth 130 placed on the occlusal plate 140 is fixed to the denture base 120. In this embodiment, specifically, for example, the following is performed. The figure for description was represented to FIGS.

First, as shown in FIG. 14, a resin 125 as an adhesive is disposed in the recess 122 of the denture base 120. As this resin, an ordinary resin used when fixing an artificial tooth to a denture base can be used.
Next, in this example, the artificial tooth 130 is first arranged on the denture base 120 on the upper jaw side. At that time, as shown in FIG. 15, the artificial teeth 130 arranged on the occlusal plate 140 are collectively pressed against the upper denture base 120, and the respective artificial teeth 130 are inserted into the respective recesses 122. At this time, the denture base connecting portion 151 of the positioning means 150 is connected to the denture base 120, the occlusal plate connecting portion 152 is connected to the occlusal plate 140, and these are connected by the connecting portion 153.
Thereafter, the artificial tooth 130 is placed on the denture base 120 on the lower jaw side. At that time, as shown in FIG. 16, the artificial teeth 130 arranged on the occlusal plate 140 are collectively pressed against the denture base 120 on the lower jaw side, and the respective artificial teeth 130 are inserted into the respective recesses 122. At this time, the denture base connecting portion 151 of the positioning means 150 is connected to the denture base 120, the occlusal plate connecting portion 152 is connected to the occlusal plate 140, and these are connected by the connecting portion 153.

  As described above, the occlusal plate 140 and the positioning means 150 realize the positional relationship between the plurality of artificial teeth 150, the position of the artificial teeth 150 on the denture base 120, and the occlusal relationship between the upper and lower jaws according to the design. .

  Finally, as shown in FIG. 3, the occlusal plate 140 and the positioning means 150 are removed in the occlusal plate and positioning means removal S <b> 34 to obtain the plate denture 110.

  When the positioning means 160, 170 are used, the denture can be obtained in the same manner as described above by combining the positioning means 160, 170 as described in the positioning means 60, 70. However, when the positioning means 170 is used, it is not necessary to remove the positioning means 170.

10 Plated denture (data)
20 Denture base (data)
30 Artificial teeth (data)
40 Occlusal plate (data)
50, 60, 70 Positioning means (data)
110 Denture base 120 Denture base 130 Artificial tooth 140 Occlusal plate 150, 160, 170 Positioning means

Claims (4)

A method of designing a denture on a computer based on intraoral shape data,
A process of creating the shape data of the denture base, based on the data of the intraoral shape,
Creating shape data of upper and lower artificial teeth arranged in the shape data of the denture base;
Wherein corresponding to the shape of the occlusal surface in the shape data of Hairetsu been maxillary and mandibular artificial teeth, a plate shape having the recess occlusal relationship of the occlusal surface in the shape data of the artificial teeth has been transferred the upper and lower jaws The process of creating the shape data of the occlusal plate of
A method for designing a denture, comprising: creating data of positioning means for fixing the position of the shape data of the denture base and the shape data of the occlusal plate . A method for producing a denture,
A process of designing a denture with a design method according to claim 1 ;
Producing a denture base, artificial tooth, occlusal plate, and positioning means based on the design;
A process of placing the artificial teeth prepared on the prepared occlusal plate;
Arranging the artificial teeth arranged on the occlusal plate on the denture base,
In the process of arranging the artificial tooth on the denture base, the positional relationship between the denture base and the occlusal plate is determined by the positioning means. A positioning means used when manufacturing a denture,
Corresponding to the shape of the occlusal surface of the artificial teeth of the upper and lower jaws and an occlusal plate having a recess to which the occlusal relationship of the occlusal surfaces of the artificial teeth of the upper and lower jaws is transferred , Positioning means for preparing dentures. A positioning means used when manufacturing a denture,
A denture base holding member that holds the posture of the denture base,
Corresponding to the shape of the occlusal surface of the artificial teeth of the upper and lower jaws, the occlusal plate having a recess to which the occlusal relationship of the occlusal surfaces of the artificial teeth of the upper and lower jaws is transferred is connected to the denture base holding member A positioning means for preparing a denture with a connecting member.

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