JPH0131212Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the determination of the direction of attachment and removal of local dentures, hooks,
This invention relates to a measuring instrument used for designing the contours of denture bases and bars, measuring undercuts, correcting undercuts in the direction of attachment and detachment of local dentures, etc.

For example, to measure the amount of undercuts such as hook tips, conventionally an undercut gauge is attached to the tip guide rod of a swinging arm that has a joint in the middle, and the tip of the undercut gauge is placed on the circumferential surface of the tooth. are in contact with each other.

At this time, depending on the type of hook, 0.25mm, 0.50mm,
Since three types of undercut gauges of 0.75 mm are used, it is difficult to select undercut gauges with different dimensions, and there are disadvantages in that it takes time to replace the undercut gauges.

Further, in the case of a diseased tooth (alveolar pyorrhea), measurement cannot be performed.

Furthermore, since the engaging portion of the metal floor is either deep or shallow depending on the metal used, there is a drawback that a high level of skill is required to select an undercut gauge that matches the optimal engagement position. Ta.

The purpose of this invention is to eliminate the above-mentioned drawbacks by making it possible to measure easily and quickly without using an undercut gauge, and to obtain accurate numerical values.

This idea supports the end of an arm whose tip moves in the left-right and front-back directions at the upper end of a column that stands up from the seat board, and also provides a guide rod that moves up and down at the tip of this arm. The system consists of a vertical rod that comes into contact with the peripheral surface of the teeth, a slide needle that penetrates the lower end of the vertical rod so that its axis intersects at right angles, and a differential transformer that operates by pushing back the slide needle. To provide a measuring instrument in which a detecting device having the above-mentioned configuration is removably provided, and the numerical value of the push-back stroke of the needle is displayed.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

In the figure, 1 is a pillar installed on the seat plate 2,
At the upper end of this pillar 1, the distal end of an arm 3 whose distal end moves in the left-right and front-back directions is supported.

In the illustrated case, the arm 3 has a first arm 5 whose end is rotatably attached to the upper end of the column 1 via a vertical pin 4, and a vertical pin 6 to the tip of the first arm 5. The second end is rotatably attached.
It is composed of an arm 7.

Further, on the seat plate 2, a support stand 8 for a model is provided.

The above-mentioned support stand 8 includes a pan head 9 placed on the seat plate 2 in the illustrated case, a plate-like body 10 provided so as to be able to rotate and adjust the tilt by operating the pan head 9, and this plate-like body. a fixed claw 11 standing from one side of the upper surface of 10;
A movable claw 13 whose lower part is fitted into a notch 12 facing inward (in the direction of the fixed claw 11) from the other side of the plate-shaped body 10, and the tip of the movable claw 13 is screwed into the screw hole 14 at the lower part of the movable claw 13, Male screw 1 that rotates in position
5 and a male screw 1 according to photograph 16.
The model is held between a fixed claw 11 and a movable claw 13 that slides while rotating the model.

Further, an elevating shaft 17 is provided at the tip of the arm 3, and a rod 18 is provided at the lower end of the elevating shaft 17 for bringing the lower peripheral surface into contact with the peripheral surface of the teeth.

In addition, a horizontal through hole 19 is provided at the lower end of the rod 18, and a needle 20 is inserted into this through hole 19.
The elevating shaft 17 or the rod 18 is provided with a detector B that detects the amount of movement of the needle 20 pushed back by the contact between the tooth a and the tip of the needle 20.

In the illustrated case, the detector B pivots the center of an inverted L-shaped lever 22 with a pin 21, and the needle 20
When the vertical piece of the lever 22 is brought into contact with the end of the lever 22, the lever 22 is rotated by the needle 20 being pushed back, and the rod 23 whose lower end is brought into contact with the horizontal piece of the lever 22 is raised. Although the amount of rise of the rod 23 is detected using the above-mentioned method, it is also possible to use a magnet scale or a pulse generator.

Furthermore, a display C that displays the amount of movement of the needle 20 is connected to the detector B.

In addition, as shown in the figure, there is a cylinder 25 at the tip of the arm 3.
By fitting the lifting shaft 17 into the cylindrical body 25 and incorporating a spring 26 in the cylindrical body 25 that is compressed when the lifting shaft 17 descends, the lifting shaft 17 can be easily raised and lowered. be able to.

Further, a recessed hole 27 is provided upward from the lower end surface of the lifting shaft 17, the upper end of the rod 18 is fitted into this recessed hole 27, and the upper end of the rod 18 is made detachable by screwing in a set screw 28. This allows the wax forming spatula D to be set as shown in FIG. 6 after the rod 18 is removed.

In the figure, 29 is a mounting bracket for attaching the detector B to the rod 18, 30 is a rod for attaching the indicator C to the column 1, 3
Reference numeral 1 denotes a clamping spring piece provided on the pillar member 1, and the cylindrical body 25 is pushed between the clamping spring pieces 31 to be supported. Reference numeral 32 denotes a container supported by the pillar 1. Ink can be applied to the tip of the needle 20 by an ink soaking member 33 in the container 32, and a mark can be made on the tooth a as shown in FIG.

The measuring device according to this invention has the above-mentioned configuration, and the measuring method will be explained below.
0, move the movable claw 13 to the fixed claw 11 side by rotating the male screw 15,
The model A is held between the fixed claw 11 and the movable claw 13.

Next, hold the lower end of the lifting shaft 17, bend and swing the arm 3, and raise and lower the lifting shaft 17 so that the rod faces the circumferential surface of a predetermined tooth a.
When the rod 18 is pressed against the circumferential surface of the tooth a, the tip of the needle 20 comes into contact with the circumferential surface of the tooth a and pushes the needle 20 back as shown in FIG. The amount of movement is displayed on display C.

As described above, according to the measuring instrument according to this invention, the upper end of the rod is supported at the lower end of the lifting shaft, and the needle is passed through the horizontal through hole provided at the lower end of the rod. When the rod is brought into contact with the surrounding surface and the needle is pushed back, the detector is activated and the amount of pushback of the needle is displayed on the display, which eliminates the inconvenience of having to replace the undercut gauge depending on the measurement position. Alternatively, the inconvenience of not being able to measure a diseased tooth can be eliminated.

In addition, the pillar material is provided with an arm whose tip moves in the left-right and front-back directions, and the lift shaft is supported at the tip of this arm, making it easy to measure any predetermined tooth or tooth location on the model. can.

[Brief explanation of drawings]

Figure 1 is a perspective view of the measuring instrument according to this invention, Figure 2
The figure is a perspective view of the same as above, Fig. 3 is a perspective view of the support base, Fig. 4 is a partially cutaway front view showing the main parts of the same as above, and Fig. 5 is a part showing the state in which the needle is in contact with the tooth. FIG. 6 is an enlarged front view showing another usage example. A...Model, a...Teeth, B...Detector, C...
Display device, 1... Pillar material, 2... Seat plate, 3... Arm, 4... Pin, 5... First arm, 6... Pin, 7... Second arm, 8... Support stand, 9... Pan head, 10... Plate-shaped body, 11... Fixed claw, 12...
Notch, 13...Movable claw, 14...Screw hole, 15
...Male thread, 16...Photography, 17...Lifting axis, 1
8...rod, 19...through hole, 20...needle, 21...
...Pin, 22...Lever, 23...Rod, 24
... Differential transformer, 25 ... Cylinder, 26 ... Spring,
27... Recessed hole, 28... Set screw.

Claims (1)

[Scope of utility model registration request] A seat board, a pillar material erected on the seat board, an arm whose end is attached to the top end of the pillar material so that the tip can move in the left-right and front-back directions, and an elevator provided at the end of the arm to move up and down. A shaft, a rod hanging from the lower end of this lifting shaft, a horizontal through hole provided at the lower end of this rod, a needle passed through this through hole, and a rod attached to the lifting shaft so as to detect the amount of pushback of this needle. A measuring device consisting of a supported detector, a display provided on an arm or a pillar to display the amount of pushback of the needle detected by the detector, and a model support stand on a seat plate.