JPS60176644A - Production of root canal cutter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The non-invention is to use a root canal cutting tool such as a reamer or a file for the tooth f1, which is short in length and has a good uniform structure. The method for manufacturing a root canal cutting tool that has a 5F capability is to process a metal wire material to form a predetermined tapered prismatic material, and then to cut the tip Wll' of this prismatic material.
A root canal cutting tool characterized in that it is manufactured by processing the prism to form a corner @# corresponding to the prism at the tip of the prism, and then performing torsion processing on the prism material having a pyramid at the tip. This relates to a manufacturing method.

Cutting tools that have a pyramid at the tip of a dental gluer or a file, or that are made by threading a polygonal cross section over the entire V length, have conventionally been made using metal wire materials, such as the first factor (as shown in El. 1 is cut to a predetermined length, then ground into a tapered prismatic shape with a triangular or square cross section, and then threaded. After the threading is completed, the pyramid 4 at the tip is processed, and the The cutting tool was manufactured by attaching the handle 2 to the handle 2, but as shown in Figure 2 (B), the tip 6 of the twisted prism has a diagonal length of 1 to 1. 0
mm (-side length 07~0.7 mm)
Since it is screwed into the soil, which is the best part to be hammered, it would be extremely difficult to dry-grind the first part to form a square pyramid 4 or a pentagonal pyramid (not shown) corresponding to the prism at the tip)
(1 and 1 piece.

When the conventional method as described above is carried out, from the sixth important person to (shown in Dl - rllD Those with misalignment, those where the ridgeline of the twisted pillar and the ridgeline of angle aF4 do not match,
There were a number of defective products such as those where the pyramid 4 and the twisted column were not perpendicular to the axis, and the grinding work required skill and a great deal of labor.
Is it nerve-wracking, time consuming, and therefore a relatively large tip diameter? A skilled person can only produce about 200 pieces per hour even with a 08-sized piece, and the reason for not being able to produce large pieces is that the above-mentioned reason for not being able to produce large pieces is that the twisted square prism is ground by matching 4 pieces of a square pyramid. For example, as shown in Figure 4, there is a slight difference in the ideally completed product as shown by the dotted line on one side (only by shaving, there is a misalignment of the sharp end and the lower surface of the pyramid 4). Even in light of the fact that misalignment occurs and results in defective products,
It is clear how difficult this type of work is.

I have been researching for many years whether it is possible to sharpen accurately using a jig, etc., but I have not been able to figure out which part of the screwed object should be trimmed exactly (removing the stems). There is no way to do that, and the angle of twist is slightly different, so even if you make the surface of the part from the fixed dimension base the standard, it is impossible to match the square column and the surface of the corner 4. of·
It was also difficult to capture it. Then screw IJ'
Is it possible to stop before the tip of the Y prism and make a pyramid 4 at the tip of this untwisted prism part? Since this method requires a length of , if this method is implemented, there is a risk that a portion with no twist at all will occur at the tip γfls of the prismatic portion. When using a cutting tool 7 without twisting at the tip, the chips generated when cutting the root canal wall tissue can be completely removed with this cutting tool.
There was a problem in that the chips could not be taken out and the chips, which may contain a large number of bacteria, remained in the cutting part, which would become a major problem later.

The method according to the present invention has been developed in view of these drawbacks of the conventional technology.
This technology has made it possible to mass-produce extremely high-quality products in a short period of time and at low cost.
It is something that

To explain more specifically, in the present invention, as shown in the fifth key point to tE), first, the metal wire material 1 is cut to a certain length, and then The cross section becomes triangular or square with a tip of prismatic shape ['' (grinding,
The tip of the prismatic wire material 1 that has been ground into a tapered prismatic shape is, for example, used in Patent No. 115 filed by the present patent applicant.
2938 and Japanese Patent Publication No. 58-52782, etc., by grinding to a predetermined angle jtlJ: machining'f? 0: Then, the cutting tool is manufactured by twisting the wire material 1 with a pyramid 4χ at the tip to create a twist in the square column 7415, and then attaching the handle 2 to the material Φ. I can do it.

The above-mentioned twisting process 2 f has already been developed and patented by the applicant for the Special Edition of Wood Case (Japanese Patent Application No. 120268/1982).
(2) While relatively rotating the chuck part that grips the base of the wire material and the vise claw that presses each side of this wire material at the same point in the length direction,
Using a twisting device, the corner j of the wire material 1 is
Stop the twisting process just before the torsion claw hits l14, release the chuck that can grip the base of the wire material, and then release the claw to tighten the corner J of the tip of the wire material.
llj 4 can be completely twisted up to the tip without damaging it.

The method according to the present invention does not involve first grinding the above-mentioned yll<, I11 into a prismatic shape, and then applying one piece to the other by twisting the tip (because the tip is processed into a pyramid in that state,
Pyramid processing can be performed using a prismatic body as a reference, and therefore, when a prismatic body is manufactured by grinding using the grinding method of Patent No. 1152968 of the present applicant, it is possible to hold a large number of prismatic bodies in parallel in a constant posture. However, it is possible to perform processing with an extremely high degree of ffj while rotating these items at the same time, and as a result, for example, more than 100 wire materials can be held in a jig and processed at the same time, which is very efficient, and compared to the conventional 100 wire materials. It is possible to increase the efficiency more than twice as much, and it also includes subsequent necking and machining.
Because it can be carried out, it is possible to produce products with extremely high precision in large quantities at low cost, especially when the pyramid surfaces are uneven or misaligned, the ridge lines of the pyramid and the helical column do not match, and the problem between the pyramid and the helical column. It has two great effects, such as being able to significantly prevent the production of defective products such as those that are not perpendicular to the axis.

[Brief explanation of drawings]

Figures 1 to 4 are explanatory diagrams of a conventional method and a product manufactured using the method; Figures 41 and 5 are explanatory diagrams showing the method of L. 1 is a wire material, 2 is a handle, 6 is a tip end surface, and 4 is a pyramid. Patent Applicant Matsutani Seisakusho Co., Ltd. Agent Patent Attorney Shukichi Donakagawa Figure 1 (△) (B) (C) (E) Figure 2 Figure 3 (A)' (B) (C) (D) Figure 4 Figure 5 (△) CB) (C) (D)

Claims (1)

[Claims] Process metal wire material to form a predetermined tapered prismatic material,
Next, the tip of this prismatic material is processed to form a pyramid corresponding to the prism at the tip of the prismatic material, and further, the prismatic material having the pyramid at the tip is subjected to a twisting process. A method for manufacturing a root canal cutting tool.