JP2023064007A - Medical file, dental cutter, and polishing method - Google Patents

Abstract

To provide a dental treatment instrument that can efficiently polish a dental cured product even when an electric- or compressed air-driven treatment instrument cannot be used.SOLUTION: The foregoing problem is solved by a medical file or a dental cutter having a diamond polishing part on at least a portion of a surface of a working part. The diamond polishing part is preferably formed by diamond electrodeposition.SELECTED DRAWING: Figure 1

Description

The present invention relates to a medical file, a dental cutting instrument, and a polishing method.

In dental treatment, depending on the progress of caries, a method of scraping off the carious portion and repairing the scraped portion with a dental hardening material such as resin or cement is sometimes adopted. After hardening, the dental hardened product is polished so that its surface has the same level of roughness as natural teeth.

Polishing of a dental hardened product is performed in a dental clinic or the like using an air turbine that rotates a head portion at high speed with compressed air. In some cases, home-visit dental treatment is performed using a portable handpiece (Patent Document 1).

However, in visiting dental clinics that do not have portable handpieces and in treating patients who do not like handpiece vibrations and vibration sounds, there is currently no means for polishing hardened dental materials to a normal degree. be.

JP 2002-165817 A

The present invention is intended to solve such problems. That is, an object of the present invention is to provide a dental treatment instrument capable of efficiently polishing a hardened dental material.

According to the present invention, the above objects are
[1] A medical rasp or dental cutting instrument having a diamond polishing part on at least part of the surface of the working part;
[2] The medical file or dental cutting instrument according to [1] above, wherein the diamond polishing part is formed by diamond electrodeposition;
[3] The medical file or dental cutting instrument according to [1] or [2] above, wherein the average particle size of diamond grains in the diamond polishing part is 100 to 270 μm;
[4] A polishing method comprising polishing a hardened dental product using a medical file or a dental cutting instrument having a diamond polishing part on at least a part of the surface of the working part;
can be achieved by

ADVANTAGE OF THE INVENTION According to this invention, the new dental-treatment instrument which can polish a dental hardening material efficiently can be provided.

1 is a schematic diagram of a dental appliance, according to at least one embodiment of the present invention; FIG. FIG. 2 is a diagram for explaining the dimensions and angles of a dental explorer defined by JIS standards;

Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments as long as they do not violate the gist of the present invention.

(Medical Files and Dental Cutting Instruments)
In the present embodiment, a medical rasp or dental cutting instrument (hereinafter collectively referred to as "dental instrument") is an instrument used in dental treatment. A medical file is a dental instrument capable of filing teeth or dental hardenings, such as a dental margin finishing file. A dental cutting instrument is a dental instrument having a function of cutting a tooth or a dental hardened material, and includes, for example, a dental explorer, a dental scaler, and an instrument used for dental carving. Dental hardened products include, for example, glass ionomers used in dental caries treatment.

A dental rim finishing file is a dental file instrument that is generally used for bone preparation such as the alveolar bone rim. A dental explorer is an instrument for intraoral examination, and is generally used for removing dirt in the oral cavity, measuring the depth and size of cavities, and examining the presence or absence of dental pulp. A dental scaler is a dental instrument that is generally used to remove plaque, calculus, and the like deposited on tooth surfaces. A dental carving is a dental instrument that is generally used for cutting or engraving a hardened dental product. Dental carvings include, for example, ionomer carvings (manufactured by Bethel Co., Ltd., product numbers X401PC0 and X400P30).

Preferably, the dental instrument is a non-motorized hand instrument that does not require power, such as electricity or compressed air, for use. Since the dental instrument is a non-motorized hand instrument, it is particularly useful in treating patients at visiting dental clinics and in treating patients who do not like the vibration and vibration noise of handpieces.

FIG. 1 is a schematic diagram of a dental appliance according to at least one embodiment of the present invention; FIG. FIG. 1 shows an ionomer carving (manufactured by Bethel Co., Ltd., product number X401PC0) as an example of the dental instrument 1 . As shown in FIG. 1, the dental instrument 1 comprises a working portion 2 and a handle portion 3. As shown in FIG.

(work department)
The working part 2 of the dental instrument 1 is the part that comes into contact with the tooth or dental hardened material. The working part 2 can be made of a material suitable for treating teeth or hardened dental products, and is preferably made of martensitic stainless steel or austenitic stainless steel. The working part 2 is not limited to these stainless steels, and may be made of materials of the same type that can ensure quality assurance equivalent to these stainless steels.

The shape of the working part 2 can be the known shape of medical files, such as dental edge finishing files, dental explorers, dental scalers, and dental cutting instruments, such as instruments used for dental carving. . For example, in addition to the shape shown in FIG. 1, if the dental instrument 1 is a dental explorer, the shapes of types A (010) to H (080) defined in JIS T5402 (2000) or similar commercially available and the shape of a dental explorer. Further, when the dental instrument 1 is a dental scaler, the shape of the working part 2 is the shape of types H3 to H9 defined in JIS T5406 (2000), #3, #B, #I1, #J1, Examples include shapes of #H5, #H6, #H7 and similar shapes of commercially available dental scalers. When the dental instrument 1 is a dental carving, any shape of the working portion of a known dental carving instrument can be adopted. Further, when the dental instrument 1 is a dental edge finishing file, any shape of the working portion of a known dental edge finishing file can be adopted.

Among these shapes, when the dental instrument 1 is a dental explorer, the shape of the working part 2 preferably conforms to H (080) defined in JIS T5402 (2000). It is particularly preferred that the dimensions match H(080)#9. When the working part 2 has such a shape, it is suitable for the work of polishing a tooth or a hardened dental material by providing a diamond polishing part, which will be described later.

FIG. 2 is a diagram for explaining the dimensions and angles of a dental explorer defined in JIS standard JIS T5402 (2000). A predetermined blade (not shown) is provided at the tip of the working portion 2 of the dental explorer. Specifically, the shape of the working part 2 conforming to the above H (080) is such that the blade height h ₁ indicating the distance from the tip of the blade to the center line shown in FIG. 2 is 3.5 mm or more and 11.5 mm or less. , the blade radius _r1 indicating the radius of curvature of the inner side of the blade is 11 mm, and the blade angle α indicating the angle between the center line of the blade and the center line of the instrument is 20 degrees or more and 50 degrees or less. The shape of the working part 2 conforming to H(080)#9 has a blade height _h1 of 6±0.5 mm, a blade radius _r1 of 11 mm, and a blade angle α of 35±5 degrees. be.

The working portion 2 may be provided at one end of the handle portion 3 as shown in FIG. 1 or may be provided at both ends of the handle portion 3 . Hereinafter, the end of the working portion 2 that is not in contact with the handle portion 3 will be referred to as the tip of the working portion 2 .

The thickness of the working part 2 is not particularly limited. For example, the maximum diameter of the working portion 2 is preferably 1.45 mm or less, more preferably 1.3 mm or less. When the maximum diameter is 1.45 mm or less, the working part 2 of the dental instrument 1 can easily enter between the teeth, and the later-described tooth or hardened dental material polishing work can be performed satisfactorily in detail. Moreover, the maximum diameter of the working portion 2 is preferably 0.95 mm or more, and more preferably 1.0 mm or more. When the maximum diameter is 0.95 mm or more, the rigidity of the working portion 2 is sufficient, and the polishing work can be performed satisfactorily. The thickness of the working portion 2 refers to the diameter of a circle circumscribing a cross section perpendicular to the length direction at an arbitrary point on the outer surface of the working portion 2 . The maximum diameter of the thickness of the working portion 2 means the maximum thickness of the working portion 2 .

The length _LW of the working part 2 differs depending on the standard of the type of the dental instrument 1, and any length can be adopted. The length _LW of the working portion 2 is preferably 45 mm or less, more preferably 40 mm or less. By setting the length _LW of the working portion 2 to the above length, there is an advantage that the later-described diamond polishing portion can be easily formed. In the present embodiment, the length _LW of the working portion 2 is the length of a straight line connecting the point at the end of the handle portion 3 to the point at which the center line of the handle portion 3 and the straight line in contact with the tip of the working portion 2 intersect each other. say length.

(Diamond polishing part)
The dental instrument 1 has a diamond polishing part 4 on at least part of the surface of the working part 2 . The diamond polishing part 4 is a part for polishing a tooth or a dental hardened product.

The diamond polishing part 4 may be provided on at least a part of the surface of the working part 2, but for example, it may be provided from the tip of the working part 2 to 1/4 or more of the length _LW of the working part 2. Preferably, it is more preferably provided from the tip of the working portion 2 to a length of 1/3 or more of the length _LW of the working portion 2, and more preferably 1/3 or more of the length _LW of the working portion 2 from the tip of the working portion 2. It is more preferable to provide up to the length of . Moreover, it does not necessarily have to be provided so as to include the _tip . It is sufficient that the working portion 2 is provided with the diamond polishing portion 4 at the portion where the working portion 2 is in contact with the tooth or the hardened dental product. Furthermore, the diamond polishing part 4 may be provided over the entire surface of the working part 2 .

The diamond polishing part 4 is obtained by fixing diamond particles to the surface of the working part 2 . The diamond particles may be natural diamond, chemical vapor synthesized diamond, or sintered diamond. The average particle size of diamond particles is preferably 100 μm or more, more preferably 140 μm or more. The average particle size of diamond particles is preferably 270 μm or less, more preferably 260 μm or less. When the average particle diameter of the diamond particles is within the above range, the diamond particles are firmly fixed to the working portion 2 of the dental instrument 1, which is preferable. Further, when the average particle size is within the above range, it is particularly preferable because the diamond polishing unit 4 can polish the hardened dental material more efficiently. Average particle size is a value determined using a sieving test.

The adhesion of diamond particles to the surface of the working portion 2 is preferably formed by diamond electrodeposition. The diamond electrodeposition method is a known method in which diamond particles are adhered by an electroplating method using a plating phase such as Ni. The diamond polishing part 4 to be formed has a structure in which a plating layer is formed on the main body surface of the working part 2 and diamond particles are fixed to the plating layer. Since the diamond-polishing part 4 is formed by diamond electrodeposition, it is firmly fixed, so that particles are less likely to peel off or fall during work, and since it is diamond, it is a glass ionomer that is required for treatment. Sufficient strength can be maintained for forming work such as.

The thickness of the electrodeposited portion of the diamond polishing portion 4 depends on the particle size of the diamond particles used, but is preferably, for example, 0.05 mm or more and 0.1 mm or less. When the thickness of the electrodeposited portion is 0.05 mm or more, it is easy to achieve sufficient hardness for polishing the hardened dental material by the diamond polishing section 4 . When the thickness of the electrodeposited portion is 0.1 mm or less, the adhesion of the diamond particles to the plating layer is sufficiently strong, and there is no fear that the diamond particles will fall off, so that the dental hardened product can be polished efficiently. . In addition, since it is possible to polish fine details such as between teeth, the dental hardened product can be finished in a desired shape. The thickness of the electrodeposited portion of the diamond polishing portion 4 refers to the thickness of the layer of diamond particles adhered to the surface of the working portion 2 .

The outer diameter of the diamond polishing portion is the total diameter of the working portion 2 including the electrodeposited portion of the diamond polishing portion 4, and the maximum diameter is preferably 1.0 mm or more, more preferably 1.2 mm or more. . The maximum diameter is preferably 1.5 mm or less, more preferably 1.3 mm or less. When the maximum diameter of the working portion including the electrodeposited portion of the diamond polishing portion 4 is within the above range, it is possible to polish even fine portions such as between the teeth and the root of the tooth, and a dental hardened product is desirable. can be shaped. The outer diameter of the diamond polishing part 4 means the diameter of a circle circumscribing a cross section perpendicular to the length direction at an arbitrary point on the outer surface of the working part 2 on which the diamond polishing part 4 is provided. The maximum outer diameter of the diamond-polished part 4 means the largest outer diameter of the diamond-polished part 4 .

The surface roughness Ra (arithmetic mean roughness) of the working portion 2 having the diamond polishing portion 4 may be appropriately adjusted according to the desired polishing effect. Ra is preferably 100 or more, more preferably 140 or more. Although the upper limit of the surface roughness Ra is not particularly limited, it is preferably 400 or less, more preferably 270 or less. The surface roughness Ra (arithmetic mean roughness) can be adjusted by selecting the average particle size of the diamond particles. When diamond particles with a large average particle size are used, the surface roughness Ra increases, and when diamond particles with a small average particle size are used, the surface roughness Ra can be reduced.

It is preferable that the working portion 2 having the diamond polishing portion 4 has a Vickers hardness of 70 GPa or more. When the Vickers hardness is 70 GPa or more, the dental hardened material can be satisfactorily polished. Also, the Vickers hardness is preferably 150 GPa or less. As used herein, Vickers hardness refers to a value measured by the test method specified in JIS Z2244. The above hardness can be adjusted by adjusting the content of diamond particles with respect to the electrodeposited portion and the plating conditions.

(handle)
The handle portion 3 of the dental instrument 1 is a portion that is gripped by an operator when using the dental instrument 1 . The material that constitutes the handle 3 is not particularly limited as long as it is a material suitable for use as a dental instrument or a material suitable for a worker to hold and work with, and any material can be used. For example, stainless steel such as martensitic stainless steel or austenitic stainless steel can be used as a material for the handle 3 . Moreover, the handle 3 may be made of a plastic material such as silicone. From the viewpoint of cost reduction, the material of the handle 3 of the dental instrument 1 is preferably a plastic material such as silicone. Further, when the dental instrument 1 is a dental explorer, the material of the handle 3 is preferably the above-mentioned stainless steel from the viewpoint of the performance of the polishing work.

The shape of the handle 3 is not particularly limited, and any shape known as the handle 3 of the dental instrument 1 can be adopted. For example, the shape of the handle 3 may be cylindrical or polygonal. The outer diameter of the handle 3 is preferably 8 mm or less, more preferably 6 mm or less. When the outer diameter of the handle 3 is 8 mm or less, it is easy to apply force to the gripped portion in the operation of gripping the handle 3 to grind the hardened dental material, and the grinding work can be performed satisfactorily. The outer diameter of the handle 3 is not particularly limited, but from the viewpoint of ensuring sufficient rigidity as the handle 3 of the dental instrument 1, it is preferably 3 mm or more.

Although the length _LH of the handle 3 is not particularly limited, it is preferably 110 mm or more. When the length _LH of the handle 3 is 110 mm or more, the handle 3 can be easily gripped, and the work of polishing the hardened dental material can be performed efficiently. Moreover, it is preferable that the length _LH of the handle portion 3 is 120 mm or less. Since the total length of _Lw of the working portion 2 and _LH of the handle portion 3 is defined as 178 mm or less in the JIS standard, it is preferable to set the total length within this range.

The handle 3 can be provided with a plastic coating such as PC (polycarbonate). When the coating is provided, the coating may be provided on at least a part of the handle 3 on the working part side, which is to be gripped during operation, but may be provided so as to cover the entire handle 3 . The coating makes it easier to grip the handle 3 by bringing it into close contact with the operator's hand, and can provide a non-slip function during gripping.

It is preferable that the handle 3 is provided with a non-slip portion 5 on at least a part of the handle 3 on the working part side, which is gripped by the operator during work. The non-slip portion 5 further improves the function of preventing the portion gripped by the operator from slipping during the polishing work. The non-slip portion 5 can be formed by patterning the surface of the handle 3 or by patterning the surface of the cover when the handle 3 is coated.

When the non-slip portion 5 is formed by applying a pattern, for example, intersecting straight grooves are provided, horizontal stripes or grooves are provided in the longitudinal direction of the handle 3, and as shown in FIG. It is a covering and can be formed by providing lines or grooves perpendicular to the longitudinal direction of the handle 3 . The method of forming the anti-slip portion 5 is not limited to these, and any method can be adopted as long as the anti-slip function that can withstand polishing work can be improved, such as by winding a tape with an anti-slip function.

Ordinary dental cutting instruments, such as explorers, are not intended for use in place of handpieces for polishing teeth or dental hardeners. On the other hand, since the dental instrument 1 of the present invention is used for polishing teeth or a hardened dental material, providing the non-slip portion 5 against gripping friction during polishing work of teeth or a hardened dental material further prevents slipping. It is preferable to give an effect.

When using the dental instrument 1, the operator holds the handle 3 while performing the work. The medical rasp and the dental cutting instrument according to the present embodiment having the diamond polishing part 4 in the working part 2 can efficiently polish teeth or hardened dental products. In addition, it can be used even in situations where electric or compressed air-driven therapeutic instruments cannot be used, so it is very useful in treatment such as home visit dentistry. Furthermore, since the instrument is lighter than a handpiece or the like, it is possible to reduce the burden of carrying the instrument during a visit to the dentist.

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

(Example 1 and Example 2)
A diamond polishing portion was provided by diamond electrodeposition from the tip of the working portion of a dental explorer (manufactured by Shiai Medical Co., Ltd., model number #9) to a length of 10 mm toward the handle portion. A dental explorer having a surface roughness of 100 (hereinafter referred to as SD100) in Example 1 and a surface roughness of 270 (hereinafter referred to as SD270) in Example 2 was prepared as a diamond polishing portion.

The resulting diamond-polished portion had an outer diameter of 1.4 mm, and the working portion had a Vickers hardness of 100 GPa. The thickness of the electrodeposited portion was measured with a vernier caliper and found to be 0.1 mm.

(Example 3 and Example 4)
A diamond polishing portion was provided by diamond electrodeposition from the tip of the working portion of a dental scaler (manufactured by Shiai Medical Co., Ltd., model number #H5) to a length of 10 mm toward the handle portion. Diamond electrodeposition was performed under the same conditions as in Example 1. As the diamond polishing part, a dental scaler having a surface roughness of 100 (hereinafter referred to as SD100) in Example 3 and a surface roughness of 270 (hereinafter referred to as SD270) in Example 4 was prepared.

The resulting diamond-polished part had an outer diameter of 1.2 mm and a working part with a Vickers hardness of 100 GPa. The thickness of the electrodeposited portion was measured with a vernier caliper and found to be 0.05 mm.

(Comparative example 1)
A dental explorer (manufactured by Shiai Medical Co., Ltd., model number #9), including the working part and the handle, was left in the purchased state without undergoing processing such as providing a diamond polishing part.

(Comparative example 2)
A dental scaler (manufactured by Shiai Medical Co., Ltd., model number #H5), including the working part and the handle, was left in the purchased state without undergoing processing such as providing a diamond-polishing part.

(evaluation)
As a dental hardened material, glass ionomer (manufactured by GC Co., Ltd.) silica (glass) and cement mixed with synthetic resin components were mixed, formed into a tooth shape, left to stand for 3 minutes to harden, and prepared. . The surface roughness Ra (arithmetic mean roughness) of the obtained dental cured product before polishing was measured with a digital microscope (manufactured by Keyence Corporation, model VHX-5000) and found to be 8.31. Table 1 shows the results.

The dental explorers obtained in Examples 1 and 2, the dental scalers obtained in Examples 3 and 4, the explorer without the diamond polishing part of Comparative Example 1, and the diamond of Comparative Example 2 The surface of the cured dental product was polished under the conditions of room temperature: 25° C., curing time: 5 minutes after kneading, humidity: 55%, and polishing time: 1 minute.

Table 1 shows the results of measuring the surface roughness Ra (arithmetic mean roughness) of the cured dental material after polishing with a digital microscope (manufactured by Keyence Corporation, model VHX-5000).

Comparing the surface roughness Ra of the cured dental product before and after polishing, the explorer without the diamond polishing part of Comparative Example 1 shows almost no change in the surface roughness Ra of the cured dental product before and after polishing. It turned out that the polishing was not done. In addition, with the scaler of Comparative Example 2 having no diamond polishing part, the difference in surface roughness Ra between the surface roughness Ra of the cured dental product before and after polishing was 1.08. was found to be difficult to polish. On the other hand, in the dental explorers provided with the diamond-polishing portions obtained in Examples 1 and 2, the difference in surface roughness Ra of the dental hardened material before and after polishing was 12.0 in SD100 of Example 1. 11 and the SD270 of Example 2 was 8.62. Further, in the dental scalers provided with the diamond polishing part obtained in Examples 3 and 4, the difference in surface roughness Ra of the dental hardened material before polishing and after polishing was 9 in SD100 of Example 3. .65 and the SD270 of Example 4 was 4.35. From the above, it was found that the working part provided with a diamond polishing part is useful for polishing hardened dental materials.

REFERENCE SIGNS LIST 1 dental instrument 2 working part 3 handle 4 diamond polishing part 5 non-slip part

Claims (4)

A medical rasp or dental cutting instrument comprising a diamond polishing portion on at least a portion of the surface of the working portion. 2. The medical file or dental cutting instrument according to claim 1, wherein the diamond polishing portion is formed by diamond electrodeposition. 3. The medical file or dental cutting instrument according to claim 1, wherein the average particle size of diamond grains in the diamond polishing portion is 100 to 270 μm. A polishing method comprising polishing a hardened dental product using a medical file or a dental cutting instrument having a diamond polishing portion on at least part of the surface of a working portion.

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