JPH037373B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an articulator for determining the occlusal state of dentures.

(Prior art) Articulators generally have an upper jaw and a lower jaw to which models of the upper jaw and lower jaw are attached, as shown in Utility Model Publication No. 57-40969, and the position of the upper frame is relatively changed. This method reproduces the patient's occlusal condition on a model.
The above-mentioned articulator belongs to the archon type in which the condylar sphere is held at the lower part of the mandibular frame, and has excellent reproducibility of jaw movement, but cannot faithfully reproduce all movements of the jawbone. One example of this is that the struts are fixed so that the lateral check bite cannot be fully accommodated. Another problem is that when the central occlusal position is used as a reference, the anterior and posterior positions cannot be reproduced using the two condylar paths.

(Technical Problem) It is therefore an object of the present invention to solve the above-mentioned problems and to not only perfectly fit the lateral check bite, but also to be able to do it accurately and quickly, and also to ensure that the retraction contact position is correct. The object of the present invention is to provide an articulator that can significantly expand the reproducible range of jaw movements by being able to reproduce them.

(Technical means) The purpose is to have an upper frame and a lower frame provided with members for attaching the maxillary model and the mandibular model, and connect both frames by a left and right condylar mechanism provided at the rear, and connect the upper frame to the lower frame. In an articulator that can be moved up and down relative to the lower frame, a post position adjustment mechanism is installed to move the posts that support the condylar mechanism in the left and right directions at the rear left and right sides of the lower frame, and the condyle mechanism is moved around the vertical axis. The condyle is rotatable and has a condylar passage in which the condylar bulb is inserted so as to be movable and adjustable, and a condyle shaft that horizontally passes through the condylar bulb, and further includes a condylar shaft that horizontally penetrates the condylar bulb. This is achieved by providing stoppers that are adjustable in position on the condyle axis on both the inner and outer sides of the condyle.

(Example) This will be explained below using examples.

In each figure, 1 is the upper frame, 2 is the model attachment plate attached to the bottom surface of the upper frame, 3 is the lower frame, 4 is the model attachment plate attached to the upper surface of the upper frame, and 5 is fixed to the rear left and right of the lower frame 3. 6 is a column position adjustment mechanism, 7 is a left and right column, 8 is a condylar bulb, 9 is a condylar shaft passing through it,
10 indicates an adjustment mechanism.

The pillar position adjustment mechanism 6 includes a pinion 12 mounted on a mechanism stand 11 and a rack 13 meshing with the pinion 12.
A slider 1 that slides left and right on a rail 14 having a
5, and by operating the knob 16, the left and right struts 7 can be moved closer to each other or separated from each other, and this operation also changes the distance between the condylar heads. 17 is a stator that fixes the position of the column 7, and the amount of movement of the slider 15 is determined by the slider scale 38 and the indicator 3.
9. A column supporting the condylar mechanism 10, that is, a condylar post, is mounted on a slider 15 with a vertical bearing 1.
It is mounted rotatably about its axis via a bolt 8 and fixed at a predetermined angle by a tightener 19. 20 indicates the amount of rotation, that is, the lateral condyle tract inclination angle scale.

The condyle mechanism 10 includes a retaining ring 21 attached to the upper end of the strut 7, a condyle disc 22 rotatably mounted to the inner side thereof, and a condylar channel 23 formed in the condyle disc 22 that can be moved. The condylar bulb 8 is provided with a condylar shaft 9 passing through it horizontally, and large and small screws 25, 26 for adjusting the condylar bulb back and forth are attached so as to be externally operable through a long hole 24 on the circumferential surface of the holding ring. By this operation, the condylar bulb 8 can be moved back and forth by a predetermined distance. Reference numeral 27 indicates its anteroposterior adjustment scale, 28 indicates a central lock for fixing the condylar bulb 8, 29 indicates a screw for fixing the sagittal condylar path inclination angle, and 30 indicates its inclination angle scale.

The condylar axis 9 has a position adjustable 2 on the axis.
One set of stoppers 31, 31' is connected to the condylar mechanism 1.
It is attached to sandwich 0 from the inside and outside. The medial stoppers 31, 31 are placed inside the left and right condylar disks 22, 22, respectively, and are placed on the condylar axis 9 to determine the lateral path angle and the sagittal condylar path angle when taking a lateral check bite. The outer stoppers 31', 31' are formed to be able to slide and be fixed at any position, and the outer stoppers 31', 31' are attached to the left and right condylar disks 22, 22.
are placed on the outside of each of the occlusal positions and are used to adjust the path of movement from the central occlusal position to the retracted position. Each stopper 31, 31' consists of an inner cylinder 32, an outer cylinder 33 screwed into the inner cylinder 32, and a fixing screw 34 screwed into the inner cylinder 32, and a main scale 35 protruding outward from the inner cylinder 32 and one end of the outer cylinder 33. For example, if a screw with a subscale 36 that divides the periphery equally and has an inner and outer cylinder screwed together has a pitch of 1 mm per clockwise rotation, the amount of advance and retraction will be 3 on both the main and sub scales.
5, 36. Note that the tip of the fixing screw 34 is engaged with a long hole 37 formed in the longitudinal direction of the condylar shaft 9 to prevent rotation.

The upper frame 1 is supported by the condylar shaft 9 on a shaft support 40 at the rear end, and an incisor pin 42 attached by a removable screw 41 abuts an incisor road plate 43 at the front end.

In addition, 44 is a main guide shaft provided on the upper model attachment plate 2 so as to protrude upward, 45 is two width guide shafts arranged before and after the main guide shaft, and 46 and 47 are respective guide shafts 44, 45, and 45. The fitted shaft hole 49 is a threaded portion 4 formed across the upper frame 1 and the main guide shaft 44.
8 is a tightening screw screwed together, 50 is a lower plate stacked on the lower surface of the model attachment plate 2, 51 is a detachable screw, and 52 is a lower model attachment plate 7 detachably attached to the upper surface of the lower frame 3. The mounting screws are shown.

(Function of the invention) [] The articulator configured as described above allows the lateral movement of the post 7 and the adjustment of the inner adjustable stopper 3.
In combination with 1, adjustment for lateral check bite is facilitated as follows.

First, in Fig. 4, the end of the condylar shaft 9 is moved from position A to A', respectively, by the right side check bite.
When moving from B to B', loosen the inner stopper 31 of the right condylar bulb 8 at C and move the column 7 to C' by operating the adjustment mechanism 6, and the left condylar bulb moves from D to D'. Then, the lateral condylar angle and sagittal condylar angle seen from the horizontal plane are determined.

Next, while keeping the right stopper relaxed, return the left condylar bulb from D' to D. Distance from center to D l ₁
is unchanged, and the position of the center of the model does not change.
In this state, fix the right stopper.

If the end of the condylar shaft 9 moves from A to A'' and B to B'' due to the left check bite, the right condylar bulb moves from C' to C'', and the right lateral condylar tract angle and arrow The condylar path angle is determined. Loosen the left stopper and adjust the column 7 by operating the adjustment mechanism 6.
→ Slide it to D'', return the condylar bulb at position C to the centric while keeping the stopper at position D loosened, and fix the stopper at position D.
The distance l ₂ remains unchanged and the position of the center of the model is
It is the same as at the same point in time. In this way, the lateral condyle tract angle and the sagittal condyle tract angle can be determined simply and accurately.

[] Also, the inner stopper 31 and the outer stopper 3
By using 1' in combination, the condyle path from the central occlusion position to the retraction position can be adjusted as follows. The condylar bulb 8 is fixed in the central occlusal position, and the outer stoppers 31', 31' are inserted from both outer sides of the condylar axis 9, brought into contact with the condylar bulb 8, and fixed. Next, loosen the inner stoppers 31, 31 and move them inward. As a result, the outer stoppers 31', 31' maintain the central occlusal position, and the inner stoppers 31,
31 is not in contact with the condylar bulb 8, so the condylar bulb 8
can be moved toward the retracted position (in front of the sympathizer).

Next, while fixing the lateral condylar path angle, loosen the sagittal condylar path fixing screw 29 to make the sagittal condylar path variable, and loosen the centripetal lock 28 to move the condylar bulb 8 toward the retracted position. Make sure you can move it.

When a check bite in the retracted position is inserted between the upper and lower jaw models and adapted to the check bite, the condyle ball 8 usually moves as shown in Figure 8, and the sagittal condylar path angle from the central occlusion position to the retracted position changes. The amount of backward movement and left/right deviation can be recorded. In this state,
The sagittal condyle tract angle is fixed, the angle is read, the centrifugal clock 28 is returned until it comes into contact with the condylar bulb 8, and the amount of movement thereof is read. After the inner stoppers 31, 31 are fixed in contact with the condylar bulb 8, the outer cylinder 33 of the outer stopper 31' with vernier
is brought into contact with the condylar bulb 8, and the amount of gap therebetween is read.

[] Furthermore, it is also possible to reproduce the movement path from the central occlusion position to the retraction position.

To do this, adjust the sagittal condyle angle to the angle recorded in
Move to the recorded movement amount and press outer stopper 3.
1', 31' are brought into contact with the condylar bulb 8, and the inner stoppers 31, 31 are loosened. Extend the scales of the outer stoppers 31', 31' with the vernier to the recorded travel distance, move the condylar bulb 8 to the position where it contacts the centrifugal clock 28, and extend the vernier stoppers 31', 31'. The condylar shaft 9 is moved laterally until the outer cylinder 33 and the condylar bulb 8 come into contact with each other, and in this state, the inner stoppers 31, 31 are brought into contact with the condylar bulb 8 and fixed. This means that the condyle path from the central occlusion position to the retraction position was reproduced as recorded.

(Effects of the Invention) Since the present invention is constructed and operates as described above, it is possible to perfectly fit a lateral check bite without impairing the function of a conventional articulator, and moreover, It has the effect of being able to accurately reproduce the movement from the proximal position to the retracted position and to perform the work quickly, and the range of condylar movement reproduction by this type of articulator can be significantly expanded.

[Brief explanation of drawings]

The drawings show an embodiment of the articulator according to the present invention; FIG. 1 is a side view, FIG. 2 is a front view, FIG. 3 is a plan view, and FIGS. 4 to 8 are explanatory diagrams of the operation. 1... Upper frame, 2... Lower frame, 6... Adjustment mechanism, 7
...Strut, 8... Condylar bulb, 9... Condylar axis, 10...
...Condylar mechanism, 22... Condylar road plate, 23... Condylar road, 3
1,31'...Inner and outer stopper.

Claims (1)

[Claims] 1 It has an upper frame and a lower frame provided with members for attaching the upper jaw model and the lower jaw model, and both frames are connected by the left and right condylar head mechanisms provided at the rear, so that the upper frame can be moved up and down with respect to the lower frame. In this articulator, a post position adjustment mechanism is installed to move the post supporting the condylar head mechanism in the left and right direction on the rear left and right sides of the lower frame, and the condyle head mechanism is rotatable around a vertical axis, and It is equipped with a condylar road plate having a condyle passage into which the condylar ball is inserted so that its movement can be adjusted, and a condylar shaft that passes through the condylar ball horizontally, and furthermore, a condylar shaft on both the inner and outer sides sandwiching the condyle road board. An articulator characterized by having a stopper whose position can be adjusted.