JPH0432085Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a dental cast crown removal forceps used for removing a cast crown fitted and attached to a tooth.

<Prior Art> Conventionally, this type of dental cast crown removal forceps, such as the one shown in Utility Model Application Publication No. 53-21796, has a protrusion bent downward at the tip of the scissor-like forceps body. The other end has a sharp cutting edge.

However, in this case, when removing the cast crown from the tooth, first drill a hole in the center of the occlusal surface of the cast crown with a dental drill, and insert the bent protrusion at the tip of the forceps body into the hole. When inserted, place the sharp edge of the other end on the lower edge of the cast crown, grasp the forceps handle, and press down. Since the tooth is fixed by the protrusion, force is applied to the lower edge of the cast crown, and the force is applied to the lower edge of the cast crown. A cast crown is lifted upward, separated from the tooth, and removed.

However, since the cast crown is extremely thin and tightly fitted to the outer periphery of the tooth, the sharp cutting edge at the other end tends to slip off the lower edge of the cast crown, and therefore it is difficult to remove it. was extremely difficult. Therefore, in order to make it easier to remove, a part of the lower edge of the cast crown was shaved off with a bar, and a flat part was formed on the lower edge so that the sharp cutting edge at the tip could catch it. Therefore, it had the disadvantage of being extremely time-consuming.

<Problem to be solved by the invention> The present invention was devised in view of the above-mentioned circumstances.The buccal side of the cast crown that is to be removed from the tooth is cut vertically with a bar, and the top, When the lower forceps are inserted and the rear handles of the upper and lower forceps are firmly grasped, the tip beak of the upper forceps rises against the elasticity of the mountain-shaped elastic plate, causing the lower forceps to split into two. The distal end beaks are alternated with each other, and the cut openings are widened laterally, so that the close fit of the cast crown to the tooth is loosened. Therefore, it is an object of the present invention to provide a dental cast crown removal forceps that allows the cast crown to be easily removed from the tooth by hand.

<Means for solving the problem> The present invention uses the rear parts of two upper and lower forceps consisting of scissor-shaped forceps bodies as handle parts, and the front parts are bent downward into the same shape. In the rear part of the upper forceps sliding groove which forms the tip beak and extends from the tip beak to the distal part of the lower forceps, an inclined stopper surface is formed at the rear end of the tip part, and the tip beak of the upper forceps A narrow sliding surface is provided from the tip to the distal portion, and an upper forceps sliding surface of the lower forceps is provided,
The upper forceps are inserted into the upper forceps sliding groove of the lower forceps, and the front bent corner portions of the lower forceps and the upper forceps are pivoted, and the rear end is attached to the rear part of the front part of the upper forceps with a stop such as a screw. When the distal end of the chevron-shaped elastic plate attached with is applied to the distal upper surface and the distal upper surface of the lower forceps, the distal beak of the upper forceps and the distal beak of the lower forceps are aligned and the upper A wide protruding inclined surface provided at the rear of the sliding surface of the forceps,
A slight gap is formed between the lower forceps and the inclined stopper surface.

<Function> With the above configuration, after inserting the tip beaks of the upper and lower forceps into the cut opening made by vertically cutting the buccal side of the cast crown with a bar, by firmly grasping the upper and lower forceps, The tip beaks of the upper and lower forceps are alternated, the cutting opening is widened to the left and right, and the close fit of the cast crown to the tooth is loosened.

<Example> The present invention consists of two scissor-shaped forceps bodies,
The rear parts of the lower forceps 1 and 2 are used as handle parts 3 and 4,
In addition, the front parts 5 and 6 are respectively bent downward into the same shape to form tip beak parts 7 and 8, and an upper forceps sliding groove 9 is provided extending from the tip beak part 8 of the lower forceps 2 to the front part 6. In the rear part of the upper forceps 1, an inclined stopper surface 10 is formed at the rear end of the front part 6, and a narrow sliding surface 1 is formed from the tip beak part 7 of the upper forceps 1 to the front part 5.
1, the upper forceps sliding groove 9 of the lower forceps 2 is provided.
At the same time, the bent portions of the lower forceps 2 and the upper forceps 1 are pivotally connected to each other by a pivot 12, and the rear end is attached to the rear portion of the front portion 5 of the upper forceps 1 using a stopper 13 such as a screw.
The tip 15 of the chevron-shaped elastic plate 14 attached by
are applied to the distal upper surface 5a and the distal upper surface 6a of the lower forceps 2, so that the distal beak 7 of the upper forceps 1 and the distal beak 8 of the lower forceps 2 are aligned, and the upper forceps 1 These dental cast crown removal forceps are formed by forming a slight gap 17 between a wide protruding inclined surface 16 provided at the rear of the sliding surface 11 and the inclined stopper surface 10 of the lower forceps 2.

Cast crown 1 installed over the tooth using the present invention
8 is to be removed as follows.

First, in the present invention, if the handles 3 and 4 at the rear parts of the upper and lower forceps 1 and 2 are not firmly grasped, the rear ends of the upper forceps 1 are attached to the rear of the front part 5 of the upper forceps 1 with a stopper 13 such as a screw. When the distal end 15 of the attached chevron-shaped elastic plate 14 is applied to the upper surface 5a and the distal upper surface 6a of the lower forceps 2, the distal beak 7 of the upper forceps 1 and the distal beak 8 of the lower forceps 2 are In this state, a cut hole is cut vertically with a bar on the buccal side of the cast crown 18 from which the distal beak parts 7 and 8 are to be removed from the teeth (not shown). 18a.

In this case, the wide protruding inclined surface 16 provided at the rear of the sliding surface 11 of the upper forceps 1 and the lower forceps 2
A slight gap 17 is formed between the slanted stopper surface 10 and the slanted stopper surface 10.

Next, by firmly grasping the handles 3 and 4 at the rear of the upper and lower forceps 1 and 2, the state shown in FIG.
In the state shown in the figure, the upper forceps 1 resists the elasticity of the chevron-shaped elastic plate 14 and uses the pivot 12 as a fulcrum.
The sliding surface 11 of the upper forceps 1 smoothly rotates in the direction of the arrow in FIG. 6 along the upper forceps sliding groove 9 of the lower forceps 2.

However, in this case, the gap 17 narrows, and finally, the wide protruding inclined surface 16 provided at the rear of the sliding surface 11 of the upper forceps 1 comes into contact with the inclined stopper surface 10 of the lower forceps 2, and the upper forceps 1 rotation will stop. Therefore, the tip beak portion 7 of the upper forceps 1
are raised and become irregular as shown in FIGS. 6 and 9. In other words, the fork-shaped tip beak 8 of the lower forceps 2 is staggered with the tip beak 7 of the upper forceps 1. As shown in the figure, the cutting opening 18a is widened to the left and right.

Therefore, the tight fit of the cast crown 18 to the tooth is loosened, and the cast crown 18 can then be easily removed from the tooth by hand.

<Effects of the invention> As explained above, in the present invention, the two upper and lower forceps 1 and 2 consisting of scissor-shaped forceps bodies are pivoted by the pivot 12, and the upper and lower forceps 1 and 2 are always connected.
The distal beaks 7 and 8 are aligned by a chevron-shaped elastic plate 14, but by strongly grasping the handles 3 and 4 at the rear of the upper and lower forceps 1 and 2, the distal beaks 7 and 8 are aligned. 8 will be staggered. Therefore, by simply inserting the distal beaks 7 and 8 into the cutting opening 18a cut vertically with a bar in advance on the buccal side of the cast crown 18 that is to be removed from the tooth, and operating as described above, the crown 18 can be removed from the tooth. The cutting opening 18a is widened to the left and right, and the cast crown 18
The tight fit against the teeth can be loosened,
After that, the cast crown 18 can be easily removed from the tooth by hand. Therefore, there is no need to shave off a part of the lower edge of the cast crown with a bar, form a flat part on the lower edge, and hook the other sharp edge of the forceps, as in the past, making it extremely simple. This has the effect that the cast crown 18 can be removed from the tooth.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view of the upper forceps, Fig. 2 is a front view of the same, Fig. 3 is a plan view of the lower forceps, Fig. 4 is a front view of the same, and Fig. 5 is a plan view of the upper forceps. Figure 6 is a front view of the present invention and shows a case where the rear handles of the upper forceps and lower forceps are not grasped, and Figure 6 is a front view of the same and shows a case where the rear handles of the upper forceps and lower forceps are firmly grasped. Figure 7 is a perspective view showing the upper forceps and lower forceps when they are wide open with the pivot as a fulcrum, Figure 8 is an enlarged perspective view showing the distal beak portion in the case of Figure 5, and Figure 9 is the FIG. 10 is an enlarged perspective view showing the tip beak portion in the case shown in the figure. FIG. With a strong grasp of the
This is a partial perspective view showing the state in which the present invention is used when the tip beaks of the upper and lower forceps are alternated and the cutting opening is widened left and right. 1... Upper forceps, 2... Lower forceps, 3, 4...
Handles at the rear of the upper and lower forceps 1 and 2, 5, 6...
...Top parts of upper and lower forceps 1 and 2, 5a, 6a...
Upper and lower upper surfaces of forceps 1 and 2, 7, 8...upper,
Tip beaks of the lower forceps 1 and 2, 9... Upper forceps sliding groove provided from the tip beak 8 of the lower forceps 2 to the distal part, 10... Inclined stopper surface, 11... Narrow sliding surface, 12... Pivot, 13... Fastener such as a screw, 14... Mountain-shaped elastic plate, 15... Tip of the mountain-shaped elastic plate 14, 16... Wide protruding inclined surface, 1
7...Void part.

Claims (1)

[Scope of utility model registration request] The rear parts of the two upper and lower forceps 1 and 2 consisting of scissor-shaped forceps bodies are used as handle parts 3 and 4, and the front parts 5 and 6 are respectively bent downward into the same shape to form tip beak parts. 7 and 8, and the tip beak part 8 of the lower forceps 2
Upper forceps sliding groove 9 provided across from to the distal portion 6
In the rear part of the lower forceps 2, an inclined stopper surface 10 is formed at the rear end of the front part 6, and a narrow sliding surface 11 is provided from the tip beak part 7 of the upper forceps 1 to the front part 5. The lower forceps 2 and the upper forceps 1 are fitted into the forceps sliding groove 9, and the front bent portions of the lower forceps 2 and the upper forceps 1 are pivotally connected by a pivot 12, and the rear ends are attached to the rear part of the front part 5 of the upper forceps 1 with a stop such as a screw. When the distal end portion 15 of the chevron-shaped elastic plate 14 attached by 13 is applied to the distal upper surface 5a and the distal upper surface 6a of the lower forceps 2, the distal beak portion 7 of the upper forceps 1
and the tip beak 8 of the lower forceps 2 are aligned, and there is a slight gap between the wide protruding inclined surface 16 provided at the rear of the sliding surface 11 of the upper forceps 1 and the inclined stopper surface 10 of the lower forceps 2. Dental cast crown removal forceps formed with a cavity 17.