JPH06304191A - Method for designing bite plate for plate denture - Google Patents

Abstract

PURPOSE:To provide the bite plate meeting an individual patient by designing the bite plate for production of the plate denture from a noninvasively obtd pyramid form and intraoral mucosa form. CONSTITUTION:The shape coordinate data measured with or without contact in accordance with a gypsum model having, for example, the shape of the intraoral mucosa is used as intraoral mucosa information and the analog and digital three-dimensional coordinate data obtd. noninvasively by CT or X-ray photography, etc., is used as the maxillary shape information. Both sets of the data are inputted to a three-dimensional coordinate computer, such as device for executing image analysis, correction, display, etc., by which an anatomical target point is detected from the shape coordinate data and the three- dimensional coordinate data and thereafter, the representative design values 1 to 5 of the bite plate are calculated. As a result, the time for prepn. of the bite plate at the time of occlusal registration is shortened and, therefore, the patient's burden at the time of treatment is decreased and simultaneously, the variations in the adaptability of the finished denture by variations in the techniques of a dentist and technician are decreased.

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 an occlusal bed used to determine the basic shape of a plate denture in the process of preparing a plate denture.

[0002]

2. Description of the Related Art In a conventional occlusal floor design and manufacturing method, a technician prepares a mold for the patient's mouth, and a technician prepares a tray for molding the individual patient based on this mold. Using this personal tray, the dentist takes the mold in the oral cavity again, and the technician creates a working plaster model from this mold, and creates an occlusal floor based on the average value on the working plaster model. Create. In this case, although the finished occlusal bed has the shape of the mucous membrane surface of the patient's oral cavity, it has a large influence on the occlusal function when the denture is placed in the oral cavity Since the spatial angle with respect to the plane is based on the average value, the process of adjusting the occlusal bed (shaving and raising) during occlusal sampling varied greatly depending on the individual patient. Since occlusal sampling using this occlusal bed greatly affects the fitness of the completed denture, it was an important point how clinically an occlusal bed suitable for each patient could be provided. Further, in order to produce a working model for producing an occlusal floor, it was necessary to mold the oral cavity twice.

[0003]

The object of the present invention is to improve the occlusal bed of the conventional average value form and size to a clinically superior one from the jaw bone form and the oral mucosa form of the individual patient. Provided is a design method for manufacturing an occlusal floor.

[0004]

EXAMPLES The concrete method of the present invention is as follows.
An occlusal bed as shown in FIG. 1 is designed based on oral mucosa information and jaw bone morphology information. (A) is a perspective view, (b) shows an upper jaw, (c) shows a lower jaw. Oral mucous membrane information is the shape coordinate data measured by contact or non-contact based on the plaster model having the oral mucosa surface shape created by the conventional method, or other surface shape measuring apparatus or soft tissue shape measuring apparatus. Either shape coordinate data obtained by directly measuring the inside of the oral cavity may be used. Jaw bone morphology information is CT or X
Non-invasively obtained analog or digital three-dimensional shape coordinate data by radiography or the like is desirable. Figure 1 at this time
It is desirable that the relative positional relationship of the lower jaw shown in FIG. 1 (c) with respect to the upper jaw shown in (b) is measured in the mandibular rest position. Both data are automatically or manually input to a three-dimensional coordinate data calculator such as a device for image analysis, correction and display. Next, after detecting the anatomical landmarks shown in FIG. 2 from the shape coordinate data and the three-dimensional coordinate data, based on these anatomical landmarks (for example, 21 to 26 in FIG. 2), representative design values of the occlusal floor are obtained. To calculate. Typical design values are, for example, the values of the parts shown in 1 to 5 of (a), (b) and (c) of FIG. 2 in FIGS. 1 (b) and 1 (c) is the curvature of the occlusal bed, and 5 in FIG. 1 (a) is a representative value of the height of the occlusal bed. These values are determined by the anatomical landmarks (21-26, etc. of FIG. 2) of the jaw bone (200) of FIG.
For example, in FIG. 2, the spatial angle of the virtual occlusal plane (ab plane in FIG. 2) with respect to the occlusal floor mucosa side surface is 21 in FIG.
And 22 (21 on the left and right of the lower jaw). The overall height of the occlusal bed (201) (eg, typically in FIG.
The distance between e and f) can be represented by the distance between the oral surface of the maxilla and the oral surface of the mandible. This is because the accuracy of the height of the occlusal bed (201) can tolerate an error in the thickness of the mucous membrane surface (1 mm or less). The distance from the ab plane to the maxillary plane is preferably derived with reference to the lip line in the patient's mandibular rest position. When collecting jawbone information by CT or X-ray imaging, the same criteria as above can be easily obtained by adding an X-ray opaque substance to the lip line portion at the time of imaging. Based on this lip line part,
Match a. In addition, as shown in FIGS. 1 (b) and 1 (c),
The degree of curvature of the occlusal bed (201) of FIG.
However, the ideal degree of curvature can be determined by matching it with the alveolar vertex line of the jawbone. Also, FIG.
(B) The orthogonal width of the virtual occlusion planes 3 and 4 in (c) to 2 is preferably 80 to 110% of the width of the jaw bone. further,
The degree of protrusion of the denture base toward the front of the face in FIG. 2 (distance a-g from the intersection point g between ef and a-b in FIG. 2) is
It is preferable that the distance is 5 to 15 mm from the intersection point (almost coincident with g) of ab and 24-25 connecting the alveolar apex frontmost portions of the upper and lower jaws. The occlusal bed (201) having a size or form based on the typical design value obtained from the above process is manufactured. As the manufacturing apparatus, when the above-mentioned design values are obtained by algorithm processing by a computer such as CAD, a CAM such as an NC machine tool is preferably used.
Since the data such as the jaw bone shape and the anatomical reference points are stored in the electronic storage device, it is possible to create the same number of occlusal beds for dentures with the same floor.

[0005]

EFFECTS OF THE INVENTION The effects of the above-described embodiments can be completed by adjusting the occlusal bed during occlusal sampling, which reduces the burden on the patient during medical treatment and at the same time improves the dentist and technician skills. Variability in denture compatibility is reduced. In addition, the compatibility is greatly improved overall. or,
The occlusal bed can be designed according to the individual oral morphology of the patient.

[Brief description of drawings]

[Figure 1]

FIG. 2 is a diagram for explaining the present invention.

[Explanation of symbols]

 21-26 Anatomical Marks

Claims (2)

[Claims] 1. A method for designing an occlusal floor for producing a denture with a jaw bone shape and an intraoral mucosa shape obtained non-invasively. 2. From the jaw bone morphology obtained non-invasively,
The method for designing an occlusal bed for a denture having a denture according to claim 1, wherein the size or shape of the occlusal bed is designed based on one or more anatomical reference points.