JPH0441850Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> The invention aims to correct occlusal problems such as extruded teeth, low-positioned teeth, sagittal angle of the occlusal plane, and left-right differences during crown restoration and denture manufacturing. By setting the plane,
The present invention relates to an occlusal plane examination/diagnosis device that enables accurate examination/diagnosis.

<Conventional technology> Appropriately restoring the occlusal plane in cases where the occlusal plane is disturbed when the jaw is edentulous or in cases where the jaw is edentulous is the most important basic point when considering occlusion that is in harmony with the living body. There is one.

Traditionally, the criteria for diagnosing or setting these occlusal planes is that the so-called Camper's plane (naso-acoustic line), which connects the infranasal point and the upper edges of the left and right external auditory canals, is almost parallel to the occlusal plane, so The method of determining standards is applied in daily clinical practice.

<Problems that the invention aims to solve> However, the occlusal plane differs from patient to patient, and examining and diagnosing based on the above-mentioned reference plane does not allow for appropriate treatment that corresponds to these individual differences. Therefore, in order to match biological standards, dentists and technicians have to visually observe and manufacture products based on their intuition and experience, which tends to cause errors and lack reliability. There is a point.

<Means for solving the problem> The present invention solves the above problem and grasps the unique occlusal plane of each patient to enable correct examination and diagnosis. A model stand capable of positioning and holding a model is provided so as to be tiltable in a vertical plane, a support is set up on the side of the model stand of the base, and a support arm is attached to the top of the support above the model stand. An occlusal plane examination/diagnosis device provided parallel to the table and having a holder attached to the support arm so as to be slidable along the support arm, the apparatus comprising an angle scale for displaying the inclination angle of the model table, The holding body is configured to have an examination/diagnosis reference body attached thereto, which is positioned and held on the model table and which can be brought into contact with and separated from the mandibular model.

<Operation> In the case of a lower jaw model First, as shown in FIGS. 7 and 8, the 4-inch spherical plate that is the reference body 32 for examination and diagnosis is placed with its convex surface facing downward, and the lower jaw model 36 is placed with the tooth row 38 side facing downward. Place the lower jaw model 36 on the model table 9 with its centers aligned upwards and turn the feed screw 16, the movable pin 13 moves to the left in the figure and clamps and fixes the lower jaw model 36 between it and the fixed pins 12, 12. do. Next, as shown in FIG. 10, the holding body 23 is moved along the support arm 18 and positioned directly above the mandibular model 36, and the elevating shaft 29 is further lowered to place the reference body 32 at the lower end above the mandibular model 36. bring it into contact with. In this case, the occlusal plane of the mandibular model 36 is inclined at approximately 11 degrees with respect to the horizontal plane since the model table 9 is horizontal, so the lower surface of the reference body 32 is in contact with the highest part of the mandibular model 36. Ru.

In this state, as shown in Fig. 11, the feed screw 4
The model stand 9 is tilted by turning to make the lower surface of the reference body 32 and the upper surface of the lower jaw model 36 parallel, and then the reference body 3 is tilted.
2 is lowered again, the two come into a predetermined contact state as shown in FIG. 13, and the model stand 9 at this time
The inclination angle is supported by the pointer 9b, and this becomes the angle of the occlusal plane.

In the case of the maxillary model As shown in Fig. 14, the 4-inch spherical plate serving as the reference body 32 is positioned with its concave surface facing downward, and the maxillary model 35 is positioned and fixed on the model stand 9 in the same manner as described above (see Fig. 15). ). Thereafter, the lifting shaft 29 of the holder 23 is lowered in the same manner as described above, and the upper jaw model 35 is
The lower surface of the reference body 32 is brought into contact with the upper surface, and the model stand 9 is tilted in the opposite direction by turning the feed screw 4, so that the two are positioned parallel to each other and brought into contact (see FIG. 17). At this time, the inclination angle indicated by the pointer 9b becomes the angle of the occlusal plane.

<Examples> The present invention will be described below based on illustrated examples.

The lower jaw model used in this example is manufactured by a conventional method, and its base horizontal reference plane is the Frankfurt plane (eye-ear plane), that is, the lowest point of the lower margins of the left and right orbits. and the center of
A plane connecting the upper edges of the left and right external auditory canal transmission images is used. This is because the horizontal reference plane when a person stands upright is usually the Frankfurt plane, and the Frankfurt plane is the standard for most facebows used when attaching jaw models in articulators. This is because the base surface of the model tooth attached to the articulator is parallel to the Frankfurt plane, and the upper and lower arches of the articulator are set parallel to the Frankfurt plane.

In FIGS. 1 to 5, reference numeral 1 denotes a base made of metal or other material, and on one side of the upper surface of the base 1, a pair of plate-shaped support members 2, 2 are erected facing each other with a space between them. , 2 are connected to each other by a pair of connecting members 3, 3 at the ends of the bases 1 and approximately at the center thereof. A feed screw 4 is rotatably supported between the connecting members 3, 3, and a square nut 6 with a locking portion 5 projecting from the top thereof is screwed onto the feed screw 4. Both sides of the nut 6 are slidable on guide portions 7, 7 formed on opposite sides of the support members 2, 2, so that the rotation of the feed screw 4 causes the nut 6 to move along the feed screw 4. It is said that it is possible to move forward and backward along the Also,
In the embodiment, the supporting members 2, 2 have a mountain-shaped upper side, and a horizontal shaft 8 is supported between the mountain-shaped protrusions.

Reference numeral 9 denotes a model stand that can position and hold the upper and lower jaw models 35 and 36, and the support members 2 and 2
A pair of locking legs 1 protruding from each other with a space between them.
0 and 10, and the model stand 9 is provided above the supporting members 2 and 2 so as to be tiltable in a vertical plane indicated by an arrow A. Further, a groove-shaped locking portion 11 is formed on the lower side of each of the locking legs 10, 10, and the locking portion 5 of the nut 6 is engaged with the locking portion 11. As a result, by moving the nut 6 forward and backward through rotation of the feed screw 4, the locking leg 10 rotates about the horizontal axis 8, and the model stand 9 is tilted in a vertical plane.

A pair of fixed pins 12 and a movable pin 13 are disposed on the upper surface of the model stand 9 for placing upper and lower jaw models 35 and 36 and positioning and holding them in predetermined positions. As shown in FIG. 5, a stepped portion 15 is fitted into a guide groove 14 formed in the model stand 9 in parallel with the feed screw 4, and is provided at the lower side of the guide groove 14.
It is made possible to slide within the guide groove 14 as shown by arrow B while being guided by. The movable pin 13 is threaded onto a feed screw 16 which is parallel to the guide groove 14 and is horizontally supported within the guide groove 14. As the feed screw 16 rotates, the movable pin 13 is guided. It is allowed to move forward and backward along the groove 14.

Furthermore, an indicator plate 9a is provided on the rear side of the model stand 9 to protrude downward, and a pointer 9b is formed at the tip of the indicator plate 9a, whereas an angle scale 2a is formed on the surface of the corresponding support member 2. The indicated position of the pointer 9b when the model stand 9 is horizontal on the indicating members 2, 2 is an angle of 0, and required angle scales are provided on both sides thereof.

Reference numeral 17 denotes a column erected on the base 1 on the side of the model table 9, and an instruction arm 18 is attached to the upper part of the column 17 via guide portions 19 provided on both sides of the base.
It is mounted so as to be rotatable as shown by arrow C around a rotation shaft 20 which is pivotally supported by. As shown in FIG. 2, this support arm 18 is placed on the top of the column 17 and is parallel to the base 1.
Moreover, it is designed to be held parallel to the axis of the feed screw 16 of the model stand 9.

As shown in FIG. 3, the support arm 18 has a guide groove 21 formed therein.
6, that is, parallel to the support arm 18, and a stepped portion 22 is provided on the lower side of the opposing surface in the longitudinal direction.

Reference numeral 23 denotes a holder that is slidably attached to the guide groove 21 of the instruction arm 18 as shown by arrow D, and its main body 24 is attached to the stepped portion 22 as shown in FIGS.
Steps 25 corresponding to the guide grooves 21 are formed on both sides.
A cylindrical body 26 that protrudes upward is inserted and fixed in the center of the cylindrical body, and a holding cylindrical body 27 is fixed to the lower part with mounting bolts 28, 28, and is suspended. It is set up. An elevating shaft 29 is inserted through the holding body 23 so as to be able to rise and fall freely, and the elevating shaft 29 is supported by a coil spring mounted between a flange 30 formed on the upper side of the elevating shaft 29 and the holding cylinder 27. 31, it is always urged upward and suspended. Further, at the lower end of the lifting shaft 29, each tooth row 3 of the upper and lower jaw models 35 and 36 held on the model stand 9 is provided.
An examination/diagnosis reference body 32 for 7 and 38 is mounted horizontally. This reference body 32 is composed of a spherical plate with a radius of 4 inches formed according to the Monson spherical theory, which states that the teeth of the lower jaw are all in contact with a spherical surface with a radius of 4 inches, and the center is located at the crest of the ethmoid bone. This is convenient for applying an adjustment curve to the occlusal ridge in the case of an edentulous or edentulous jaw, but a simple flat plate is also used in other cases. And 33 is a support arm 18 for holding body 23.
34 is a screw member for fixing or releasing the elevating shaft 29, which is screwed onto the holding cylinder 27;
5 and 36 indicate an upper jaw model and a lower jaw model, respectively.

Next, the operation of the occlusal plane examination/diagnosis device according to the present invention will be explained with reference to FIGS. 7 to 18. A midsagittal line is drawn in advance on the lower surface of the upper arch and the upper surface of the lower arch of a general articulator (not shown) used with the examination/diagnosis device, and a diagnostic plaster model is made. The lower jaw models 35 and 36 are attached to the articulator using commonly used face bows. In this case, upper and lower jaw models 35, 3
The back surface, which is the base surface of 6, uses the Frankfurt plane as in the previous section, so the top of the articulator,
It is parallel to the lower arch. After drawing a sagittal line on the anterior and posterior bases of the upper and lower jaw models 35 and 36 attached to the articulator in this way, matching the median sagittal line drawn on the upper and lower arches of the articulator, Up,
The lower jaw models 35 and 36 are removed from the articulator.

1 In case of edentulous jaw (a) Mandibular model As shown in Fig. 7, the convex surface of the 4-inch spherical plate serving as the reference body 32 faces downward, and the support arm 18 is rotated upward as shown in Fig. 8. . Then, the lower jaw model 36 is placed on the model stand 9 which is in a horizontal position, and the lower jaw model 36 is placed on the midsagittal line provided on the model stand 9.
Align the midsagittal line of the lead screw 16.
Turn the movable pin 13 and fix it on the model stand 9. At this time, since the model stand 9 is horizontal, the occlusal plane of the lower jaw model 36 is approximately equal to the horizontal plane.
It is tilted at 11 degrees.

Next, as shown in FIGS. 9 and 10, the support arm 18 is returned to the horizontal position, and the lifting shaft 29 is lowered against the elastic force of the coil spring 31, so that the convex portion of the reference body 32 at the lower end thereof is lowered. is brought close to the lower jaw model 36, and the screw member 34 is tightened to fix the elevating shaft 29. At this time, the longitudinal position of the 4-inch spherical plate that is the reference body 32 is determined by loosening the bolt 33 and sliding the holder 23 against the support arm 18 so that its lowest point is at the position of the first molar tooth. Adjust.

Next, in order to check the parallelism between the tooth row 38 of the lower jaw model 36 and the 4-inch spherical plate, the feed screw 16 is turned to move the model stand 9 counterclockwise around the horizontal axis 8, as shown in FIG. Tilt in the rotation direction. As a result, the lower jaw model 36 moves diagonally downward and its position with the 4-inch spherical plate shifts, so the bolt 3
3 to slide the holder 23 relative to the support arm 18, and as shown in FIG. 12, the two are placed in the relative position described above. Then, as shown in FIG. 13 again, the screw member 34 is loosened, the reference body 32 is lowered, and the parallelism is examined by bringing it close to the tooth row 38 of the lower jaw model 36.

When both are made parallel as shown in FIG. 13 by the above operation, the scale 2a on the indicator plate 9a at that time is read. As a result, an accurate angle of the occlusal plane in the mandibular model 36 with respect to the Frankfurt plane can be obtained, and this angle is recorded in the medical treatment plan and technician instructions.

(b) Upper jaw model In this case, as shown in Fig. 14, the reference body 32
A 4-inch spherical plate is attached to the lifting shaft 29 with its concave surface facing downward. Then, as shown in FIG. 15, after tilting the support arm 18 upward, the maxillary model 35 is placed on the model stand in the same manner as above, the midsagittal line of both is aligned, and the feed screw 16 is operated. fix the upper jaw model 35 with the fixed pins 12, 12 and the movable pin 1
Secure it by sandwiching it between the two. At this time, upper jaw model 3
5 is in an inverted state compared to the actual state, so its occlusal plane is inclined in the opposite direction from that of the lower jaw model 36.

Next, as shown in FIG.
8 to the horizontal position, loosen the bolt 33 and slide the holder 23 along the support arm 18 to position the 4-inch spherical body on the upper jaw model 35, and then lower the elevating shaft 29 to remove it. The surface of the 4-inch spherical body at the lower end is brought close to the tooth row 37 of the upper jaw model 35, and the screw member 34 is tightened and fixed.

In this state, the parallelism between the 4-inch spherical plate and the tooth row 37 of the upper jaw model 35 is checked, and the feed screw 4 is operated to tilt the model stand 9 clockwise around the horizontal axis 8. As above, by repeating these operations, parallelism between the reference body 32 and the tooth row 37 of the maxillary model 35 is obtained (Fig. 17), and the angle of the scale 2a with the pointer 9b is read at this time and recorded in the medical treatment plan, etc. do. In this case, as shown in Figure 18,
By turning the whole thing 180 degrees,
The relationship between the tooth row 37 and the reference body 32 becomes easier to see,
Examination and diagnosis become easier.

In the case of an edentulous jaw In this case, first, a base bed is prepared using instant polymerization resin on working models of the upper and lower jaws according to the standard method, and then an occlusal ridge is created on this using paraffin wax.

Try these upper and lower occlusal bases into the oral cavity to determine the height of the occlusal ridges of the anterior teeth. After that, use a face bow to attach it to the articulator, and draw a sagittal line on the anterior and posterior base of the upper and lower jaw working models to match the midsagittal line of the upper and lower arches of the articulator, and then draw the sagittal lines on the upper and lower jaw working models. Remove from the articulator.

Next, these upper and lower jaw working models are each fixed on the model stand 9 in the same manner as in the case of a toothed jaw.

Then, in the same manner as described above, the lifting shaft 29 is lowered to bring the reference body 32 close to the occlusal frame of the upper jaw working model or the lower jaw working model, and the feed screw 4 is actuated to make the model stand 9.
Tilt. In this case, the occlusal ridge becomes parallel to the Camper's plane by tilting about 11 degrees from the horizontal state, so the model table 9 is adjusted to this angle to correct the occlusal ridge so that it is parallel to the Camper's plane. At this time, if the occlusal ridge is insufficient, add it.

In addition, in cases where the shape of the alveolus is low, or in cases of flavi gum in the maxillary anterior teeth, etc., in order to improve the stability of the denture base, it is better to lower the occlusal plane slightly downward than to make it parallel to the Camper's plane. For example, there are cases where it is lowered approximately 7 degrees backward and downward from the Camper's plane.In this case, the angle is approximately 4 degrees with respect to the Frankfurt plane, so the inclination angle of the model stand 9 is set to 4 degrees. You can adjust it so that Further, when the occlusal ridge is provided with an adjustment curve, a 4-inch spherical plate is used as the reference body 32.

In addition, it is desirable that the range of tilting of the model table 9 in the vertical plane can be adjusted up to a maximum of 20 degrees, although it depends on the case. There is no problem in using the plane formed by connecting the three points of Hamiulana.

<Effects of the invention> As is clear from the above explanation, according to the invention, it is possible to examine and diagnose the occlusal plane and accommodation curve unique to each patient with simple operations, and this allows for the diagnosis and treatment of protruding teeth,
Discovery of low teeth, determination of their removal amount and addition amount,
In addition, the examination and diagnosis of inappropriate crown prostheses can be easily performed, and since the tilting of the model table is carried out by a feed screw, fine adjustments can be made to accommodate all kinds of situations, and angle values can be calculated. It can be displayed clearly, so there are no mistakes, and the necessary departments can be contacted by phone, which is extremely efficient. It is also effective for diagnosing and determining the occlusal plane in prosthesis for one oral cavity, determining the occlusal plane and accommodation curve during wax model formation, and especially in the case of edentulous jaws, it is useful for diagnosing and determining the occlusal plane of the occlusal floor. The 4-inch spherical plate is effective in determining and adjusting curvature, and it eliminates the hassle of using a complicated articulator when creating a crown prosthesis that is morphologically and functionally harmonious. can proceed efficiently.

Incidentally, a movable dental parallelism measurement device with a tiltable model table is disclosed, for example, in Japanese Patent Application Laid-open No. 163654/1983, but in such a conventional device, the inclination angle of the model table cannot be changed. Since it does not have an angle scale to display or a reference body for examining and diagnosing the occlusal plane of the model, it is difficult to easily and accurately examine, diagnose, and set the occlusal plane and occlusal curvature of the model. I couldn't get any effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention: Fig. 1 is a perspective view of the model stand in a horizontal state, Fig. 2 is a partially cutaway front view, Fig. 3 is a plan view, and Fig. 4 is a perspective view of the model stand in a horizontal state. 3
Figure 5 is an enlarged side view of the sliding part of the holder indicated by the - line in the figure, Figure 5 is a plan view of the model stand indicated by the - line in Figure 2, and Figure 6 is a partial cutaway of the model stand portion indicated by the - line in Figure 2. Enlarged side view, No. 7~
FIG. 13 is an explanatory diagram showing the process of implementing the present invention on a lower jaw model, and FIGS. 14 to 18 are explanatory diagrams showing the process of implementing the present invention on an upper jaw model. 1... Base, 9... Model stand, 17... Support, 1
8... Support arm, 23... Holding body, 32... Reference body, 35... Upper jaw model, 36... Lower jaw model.

Claims (1)

[Scope of Claim for Utility Model Registration] A model stand capable of positioning and holding upper and lower jaw models is provided on the base so as to be tiltable in a vertical plane, and a support is erected on the side of the model stand of the base, An occlusal plane examination/diagnosis device, wherein a support arm is provided on the upper part of the support column in parallel with the base above the model table, and a holder is attached to the support arm so as to be slidable along the support arm, the apparatus comprising: The holding body is provided with an angle scale for displaying the inclination angle of the model stand, and an examination/diagnosis reference body is attached to the holder, which is positioned and held on the model stand and can be moved into and out of contact with the mandibular model. Characteristic occlusal plane examination/diagnosis device.