JPH06304188A - Method for designing plate denture - Google Patents

Abstract

PURPOSE:To automatically design the entire part of a plate denture by the design information based on the three-dimensional coordinate data of a plate denture shape by determining the optimum determination value of arrangement of prosthetic teeth by the three-dimensional coordinate data including the surface shape of a bite plate and various sets of the previously stored data of the prosthetic teeth and designing the plate denture shape. CONSTITUTION:An input means 02 automatically or manually inputs the three- dimensional coordinate data obtd. by a measuring means 01 which measures the bite plate obtd. by occlusal registration as the three-dimensional coordinate data. An automatic prosthetic tooth arranging means 04 automatically and variably arranges the prosthetic teeth in accordance with the existing information of the prosthetic teeth accumulated in a data base 03 and the three-dimensional coordinate data inputted by the input means 02. A plate denture shape determining means 05 determines the optimized plate denture statistically or aritificial-intelligently or inclusive of an operator's judgment from the arranging result of the prosthetic teeth and the other data. The output of this plate denture shape determining means 05 is connected to a working means, which in turn executes prosthetic tooth arrangement of the bite plate and wax up of the plate denture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for designing a plate denture.

[0002]

2. Description of the Related Art Conventionally, a denture with a denture is occluded in a patient's mouth with an occlusal bed which is a pseudo model of the denture, and the occlusal bed is adjusted so that the occlusal state at that time is most suitable for the patient. After that, the technician waxed up the occlusal floor itself,
Artificial teeth are arranged (operation of arranging artificial teeth on the denture base), and finally manufactured by the casting method. The quality of fit of the denture to the patient is determined by both the shape of the occlusal bed and the quality of the technician who processes the denture to the final form. At this time, the surface shape of the occlusal bed includes information about the denture base shape such as the shape of the mucosal surface of the denture base, or artificial tooth arrangement information. Based on this information, the technician manually performs the denture base shape and artificial tooth arrangement. The quality of the technician's personal skills in this process greatly affects the quality of the finished denture. This is because there is a considerable difference in the skill of the individual in processing the shape of the plate denture while reading the design information contained in the occlusal floor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and three-dimensional coordinate data of the shape of a plate denture when manufacturing a plate denture based on the shape of the occlusal bed. To provide a method for automatically designing an entire denture having a plate based on design information based on.

[0004]

EXAMPLES Specific examples of the present invention will be described.
The preformed occlusal bed (111) is shown in FIG. 1 (front surface) and FIG. 2 (side surface). FIG. 3 shows the shape of the upper surface of the lower jaw (1-B) of the occlusal bed (111). First, each surface shape of the occlusal bed for the upper jaw (1-A) and the lower jaw (1-B) is measured as three-dimensional coordinate data with an optical or contact surface shape measuring device, and loaded into a computer. . Next, artificial teeth are automatically arranged on a computer as three-dimensional coordinate data based on the shape of the virtual occlusal plane (11) shown in FIGS. 1 to 3 and the periphery of the virtual occlusal plane (11). The state is as shown in FIG. 4 when the occlusal floor is viewed from the lateral side, and is as shown in FIG. 5 when the lower jaw is viewed from the upper side of the occlusal bed. Hereinafter, the numbers shown in the figures represent the clinically used tooth numbers. In the present invention, for example, as shown in FIG. 6 (anterior surface) and FIG. 7 (upper surface) for the anterior maxillary teeth, and FIG. 8 (lateral surface) for the mandibular left posterior teeth, artificial data constructed as adjacent three-dimensional coordinate data. Automatically arrange a connected artificial dentition in which each tooth is connected at a point (N). The connected artificial dentition has an anterior dentition (1 to 3) and a molar dentition (4 to
It is desirable to connect them separately in 6). For each individual artificial tooth, a reference point is set on the occlusal surface, the buccal surface (on the labial surface for the anterior tooth), or inside the artificial tooth. For example, the reference point on the occlusal surface is the highest point in the artificial tooth height direction (for example, a to c in FIG. 6 and a to d in FIG. 8),
On the labial surface of the front tooth, the minimum distance point (for example, a to c in FIG. 7) from the artificial tooth center of gravity on the surface is set, and at the molar portion (tooth numbers 4 to 6), the center of gravity is set. As shown in FIGS. 6 and 7, the reference point is aligned with the virtual occlusal plane (FIGS. 4 and 6) and with the occlusal floor anterior tooth surface (FIG. 1) (FIG. 7). Then, as to the molars, as shown in FIG. 8, the reference points a to d of the molars (4 to 6) are aligned with the ideal occlusal plane MC (cylindrical side surface shape orthogonal to the paper surface of FIG. 8). At this time, the distance may be adjusted by the distance of the reference point from the virtual occlusal plane OP in FIG. In addition to this, as shown in FIG. 5, the position of the molars (4 to 6) on the virtual occlusal plane is the reference point (the center of gravity point) of the molar, the virtual occlusal plane edge (buccal side) of the virtual occlusal plane. The edges and the lingual edge). After performing the above automatic arrangement for the upper jaw, for example, the automatic dentition automatic arrangement is performed for the lower jaw. At this time, after performing the automatic alignment in the same manner as the method performed for the upper jaw, for example, as shown in FIG. 9, for each artificial tooth of the upper jaw tooth and the lower jaw tooth, P1 shown in FIG. It is also possible to set the reference points of P2 and P3 shown in FIG. 9B in advance and readjust the upper and lower jaw dentition. According to this method, it is possible to easily design the upper and lower overlapping condition of the front teeth (the front tooth tips are separated from each other by L as shown in FIG. 9), which is conventionally important for the aesthetics of the front tooth portion. For example, by designing the shape of the actual artificial tooth to be actually arranged as three-dimensional coordinate data by the above method, a design drawing in which the arrangement position of the artificial tooth is designated is printed and displayed on a transparent paper, for example. FIG. 10 shows an example of an apparatus configured based on the design method described above. (01) is a measuring means for measuring the occlusal bed obtained by occlusion as three-dimensional coordinate data. (02) is
This is an input means, and is one for automatically or manually inputting the three-dimensional coordinate data obtained by the measuring means (01).
(03) is a database accumulating data of connected artificial teeth. (04) is an automatic tooth arranging means, and the existing information of the artificial teeth accumulated in the database (03) and the input means (02)
It is a means for variably changing the automatic arrangement of artificial teeth on the basis of the three-dimensional coordinate data input in. (05) is a plate denture shape determining means, which determines an optimized plate denture statistically, artificial intelligence, or including operator's judgment from the arrangement result of artificial teeth and other data. It is a means. The output of the plate denture shape determining means (05) is connected to a processing means composed of a CAM, NC machine tool or the like. The processing means is a means for actually arranging artificial teeth on the occlusal floor based on the shape data determined by the denture shape determining means (05) to perform wax-up of the denture. It is preferable that algorithm processing by a dedicated or general-purpose computer is performed from (02) to (05), but the present invention is not limited to this, and the whole may be configured as one dedicated machine. is there.

[0005]

EFFECTS OF THE INVENTION The present invention has an effect that it is possible to considerably reduce the variation in the personal skill of the technician that occurs when arranging artificial teeth, which has been very problematic in the past.

[Brief description of drawings]

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[Figure 8]

FIG. 9 is a diagram for explaining an example of the present invention.

FIG. 10 is a block diagram for explaining an embodiment of the present invention.

Claims (4)

[Claims] 1. A method for automatically designing a plate denture based on an occlusal bed obtained by occlusion. 2. The optimum densified value of the artificial tooth arrangement is obtained from the three-dimensional coordinate data including the surface shape of the occlusal bed and various kinds of artificial tooth data accumulated in advance to design the shape of a bed denture. A method for designing a plate denture according to. 3. The artificial denture shape is designed by virtually arranging a plurality of types of artificial teeth on a denture based on the surface shape of the occlusal bed to determine the optimal arrangement of artificial teeth. Method for designing a plate denture. 4. The method for designing a plate denture according to claim 3, wherein the artificial tooth row in which artificial teeth constructed as three-dimensional coordinate data are point-connected is automatically arranged.