JPH01146546A - Method for removing free abrasive particles of electrodeposited dental bur - Google Patents

Abstract

PURPOSE:To rapidly and certainly remove free abrasive particles by mixing an electrodeposited dental bur and a granule material in a processing tank and moving the processing tank to relatively move the electrodeposited dental bur and the particulate material. CONSTITUTION:In such a state that an electrodeposited dental bur and a granule material are mixed in a processing tank, the processing tank is moved to relatively move the electrodeposited dental bur and the granule material and both of them are allowed to repeatedly collide with each other to detach a free abrasive particle from the bur main body. As the granule material, a finely ground material of a nut shell or dried corn or a stainless bead is used. On the basis of a vol. ratio, the electrodeposited dental bur is pref. set to 15% or less and the granule material is pref. set to 85% or more. It is especially desirable to move the processing tank so as to generate the relative motion of a stirring state and there are rotary motion, linear reciprocating motion and vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention is directed to the use of abrasive grains (hereinafter referred to as free abrasive grains) that have a weak adhesion to the bar body of an electrodeposited dental bur or are simply held. ).

[Background of the invention 1] Generally, when manufacturing an electrodeposited dental bur, the bur body is inserted into abrasive grains such as diamond or cubic boron nitride deposited in a polishing bath. A plating layer of nickel or the like is formed on the bar body, and the abrasive grains are fixed to the bar body by this plating layer.

FIGS. 2 and 3 show the dental bur 1 manufactured in this manner. This dental bur 1 has a blade part 3 formed at the tip of a bar body 2, and the blade part 3 is formed by fixing abrasive grains 4 to the bar body 2 with a plating layer 5. . As is clear from these figures, the majority of the abrasive grains 4a among the abrasive grains 4 are firmly fixed to the bar body 2 by the plating layer 5 (hereinafter referred to as
It is called effective abrasive grain. ). However, some of the abrasive grains 4a
, 4a, the abrasive grains 4[] are simply held between them.

Alternatively, there are free abrasive grains such as the abrasive grains 4c, which are retained in the plating layer 5 by only about 10 to 15% of the grain size and have weak adhesion.

When teeth are ground with an electrodeposited dental bur having these free abrasive grains 4 b and 4 c, the free abrasive grains 4 b and 4 C fall off during grinding, and the fallen free abrasive grains 4 b.

4c grinds the electrodeposited dental bur 1. This causes the problem that the electrodeposited dental bur 1 wears out prematurely.

Therefore, there has been a demand for the development of a method for quickly and reliably removing the loose abrasive grains 4a and 4b.

[Objective of the invention 1 This invention consists of 1. The object of the present invention is to provide a method for removing free abrasive grains from an electrodeposited dental bur that can quickly and reliably remove free abrasive grains.

[Structure 1 of the Invention] In order to achieve the above-mentioned object, the present invention is capable of producing an electrodeposited dental bur and a granular material by moving the processing tank with the electrodeposited dental bur and granules mixed in the processing tank. The electrodeposited dental bur and the granules are caused to move relative to each other, thereby repeatedly colliding with the granules to cause loose abrasive grains to fall off the bar body.

In this case, the granules used are finely crushed walnut shells or dried corn, stainless steel beads, etc., and the particle size is preferably 35 to 50 mesh. This is because when granules finer than 50 mesh are used, the granules wrap around the electrodeposited dental bur without gaps, and the granules that collide with parts of the electrodeposited dental bur other than the free abrasive grains function as a cushion. Therefore, the impact force caused by the collision between the granules and the free abrasive grains is reduced, making it difficult to drop off the free abrasive grains, especially the free abrasive grains held by the plating layer, although very weakly. On the other hand, if granules larger than 35 meshes are used,
The gaps between the granules and between the granules and the electrodeposited dental bur become excessively large, and the impact force between the granules and the electrodeposited dental bur becomes excessive. This is because there is a risk that not only the free abrasive grains will fall off, but also the effective abrasive grains will fall off.

In addition, the capacitance ratio of the electrodeposited dental bur and the granular material is 1
It is desirable that the latter be 5% or less, and the latter be 85% or more.

This is because when the capacity ratio of the electroplated dental burs is increased to 15% or more, the frequency of collisions between the electroplated dental burs increases, causing them to scratch each other or grind each other. This is because there is a risk of impairing the quality of the product.

Regarding the movement of the processing tank, any form of movement may be used as long as it causes relative movement between the electrodeposited dental bur and the granular material, but in particular, relative movement in an agitated state may be used. It is desirable that the Examples of things that cause such relative motion in the stirring state include rotational motion, linear reciprocating motion, and vibration.

The removal method of the present invention may be carried out in a dry state in which the electrodeposited dental bur and the granules are simply mixed together, or may be carried out in a wet state in which a processing liquid is mixed therein.

[Example] Next, an example of the present invention will be described. In the following examples, electrodeposited dental burs and processing vessels of the same size were used, and the granules were changed as appropriate.

The electrodeposited dental bur was an electrodeposited dental bur 1 shown in FIG. The dimensions of each part of this electroplated dental bur 1 are set as follows.

Total length, = 21111 m Blade length L2 = 91III + 1 Shank diameter D1 = 1.6 + 1 m Maximum diameter of the blade = 1.8 mm In addition, as a processing tank, as shown in Fig. 1, a processing tank 6 having a regular hexagonal cross section was used. Using. The dimensions of this processing tank 6 are as follows.

Distance between two opposing sides, = 173 + I1m Length L4
= 200 mm Volume = 51 Example ■ Granules... Stainless steel beads Particle size... 35 Capacity ratio to mesh bar 1 (2000 pieces)... 85% (
Hereinafter, the capacity ratio is the capacity ratio for 2000 bars 1. ) Example■ Granular body...Stainless steel beads' Particle size...50 mesh capacity ratio...85% Example■ Granular (4i,...Stainless steel beads particle size...30 mesh capacity ratio...85% Example ■ Granules: Stainless steel beads particle size: 60 mesh capacity ratio: 85% Example ■ Granules: stainless steel beads particle size: 40 mesh capacity ratio: 80% Example ■ Granular material: Walnut shell particle size: 40 Mesh capacity ratio: 85% In each example, as shown in FIG. of,
Install it so that its axis faces horizontally, and rotate at a rotation speed of 45
Spin on rpn+ for 60 minutes.

The results are shown in the table below. As is clear from the table below, free abrasive grains can be removed in any of the examples, but the reliability of drop-off of free abrasive grains, the prevention of effective abrasive grains from falling off, and the prevention of scratches on electrodeposited dental burs are important. From this point of view, it is found that it is desirable that the particle size of the granules is 35 to 50 meshier and the volume ratio to the electrodeposited dental bur is 85% or more.

In the following table, the degree of shedding of floating abrasive grains is the ratio of the number of floating abrasive grains after implementation to the number of floating abrasive grains before implementation. Further, the number of effective abrasive grains falling off and the number of scratches occurring are based on the number of 2000 abrasive grains mixed in each example.

[Effect of the invention 1] As explained above, according to the method for removing free abrasive grains from an electrodeposited dental bur of the present invention, the processing tank can be opened with the electrodeposition dental bur and granules mixed in the processing tank. By exercising 1)
Since the electrodeposited dental bur and the granular body are caused to move relative to each other, the electrodeposited dental bur and the granular body repeatedly collide, thereby quickly removing the loose abrasive grains from the bar body.
Moreover, the effect of being able to reliably fall off is obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, and Fig. 2 is a front view showing an electrodeposited dental bur. Figure @3 is an enlarged sectional view of the blade. DESCRIPTION OF SYMBOLS 1... Electroplated dental bar, 4... Abrasive grain, 5... Plating layer, 6... Processing tank, 7... Granular body.

Claims (2)

[Claims] (1) Mixing an electrodeposited dental bur and granules into a processing tank,
A method for removing free abrasive grains from an electrodeposited dental bur, characterized in that the electroplated dental bur and the granular material are moved relative to each other in the processing tank by moving the processing tank. (2) the particle size of the granules is 35 to 50 mesh;
The method for removing free abrasive grains from an electrodeposited dental bur according to claim 1, wherein the volume ratio of the granules is 85% or more.