JP3080478U - Micro finishing bar (for shoulder bottom) - Google Patents

Abstract

(57) [Summary] (Modifications required) [Problem] In order for a dentist to form an abutment in the treatment of teeth, a high level of technology is required to lubricate the bottom surface. To provide a bar that can be easily and effectively lubricated using visual guidance by devising the tip shape of the bar. A groove b having a shallow bottom and a corner portion is provided on a smooth upper surface of a tip portion formed in a cylindrical shape having an inward slope m in a tip shape of the bar and having a smooth outer peripheral surface. When the bar is mounted on a high-speed rotating machine and applied to the shoulder bottom surface, the smooth surface on the top of the tip portion performs extremely fine vibration, and the surface roughness of the tooth that has been subjected to the fine vibration is smoothened.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a bar for a bottom surface which is effective in smoothing the peripheral form when performing abutment tooth formation during restoration treatment (prosthetic treatment, conservative treatment).

[0002]

[Prior art]

 In dental treatment, when a dentist performs restoration treatment (including prosthetic treatment and conservative treatment) on a tooth affected by dental caries of a patient, after the dental caries is removed, the restoration material properly removes the tooth defect. It is necessary to perform “cavity formation” or “abutment tooth formation” to be able to compensate. After forming the cavity or abutment, an impression (negative pattern) of the formed teeth is made, a model material is poured to create a working model (positive pattern), and a restoration is made by a technical operation. I do. Matching the restoration with a precisely formed “cavity” or “abutment” on the tooth increases the life of the restored tooth.

[0003] In recent years, esthetic restorative materials have been developed exponentially, and almost all technical processes for crown prostheses have been performed under a stereoscopic microscope of about 20 times, and esthetic dental restorations have been changed from artificial beauty to natural beauty. It became possible to pursue. However, at present, abutment formation and adjustment are still performed with the naked eye, a 6-8 magnification magnifier or a microscope.

[0004] This forming technique has a great influence on the fitting accuracy of the restoration. It is desirable that the bonding surface between the abutment and the prosthesis be smoother, because the poor fit between the abutment and the prosthesis is not only aesthetically unfavorable, but also the bacterial It may be a cause of accumulating the work. Bacterial plaque causes caries, gingivitis and periodontitis. In addition, the bonding portion is generally called a bottom surface.

[0005] As a conventional technique for forming an abutment tooth on the bottom surface portion, there is a method using an extra-fine diamond bar to which very fine diamond powder is applied. This is a columnar bar as shown in Fig. 1, with fine diamond adhered only to the tip surface. Generally, the diamond bar is formed by mounting the diamond bar on a high-speed rotator. The diamond used in the above diamond bar has finer diamond adhesion than the bar generally used in forming an abutment tooth.

Further, as a conventional technique, there is a formation using a winged carbide bar. The above-mentioned carbide bar is a bar for a turbine that lubricates a rough tooth surface after being formed by a diamond bar. Only natural teeth have been found to be effective in forming abutment teeth. There are several types of the bar depending on the number of wings.

[0007]

[Problems to be solved by the invention]

 Finishing after crown formation requires a great deal of time, effort, and technique.However, in the above-mentioned diamond bar and carbide bar, the wavy undulation is caused by the axial runout of the bar due to the axial runout of the high-speed rotating machine. It is difficult even with advanced technology and skill to obtain a uniform and formed surface. Further, although finer diamonds are adhered, the diamond particles have an acute angle and have a problem that deep and irregular scratches (irregularities) are formed on the abutment teeth.

[0008] Furthermore, in order to hide the marginal incompatibility, a margin is set deep under the gingival margin. However, this causes a decrease in impression accuracy, and accordingly, the incompatibility of the prosthesis and the unnaturalness. Residue of contours and even cement may occur, eventually causing gingival retraction, exposing incompatible margins.

In addition, since the diamond bar and the carbide bar do not have bevels (inwardly inclined surfaces) at their tips, they have a problem of causing an undercut which deteriorates the impression accuracy.

[0010] Therefore, an object of the present invention is to provide a micro finishing bar that is effective for lubricating the bottom surface after forming an abutment tooth using visual guidance.

[0011]

[Means for solving the problem]

 In order to achieve the above object, the micro-finishing bar of the present invention has a tip formed in a cylindrical shape having an inwardly sloped surface and having a smooth outer peripheral surface. And a high-speed rotator was provided on the opposite side of the tip. Further, the form of the groove may take a form as shown in FIGS. The material is not limited at all.

Further, a form in which no groove is provided may be adopted. In each case, it is essential that the tip be formed in a columnar shape with an inward slope.

According to the invention, it is possible to finish the bottom surface portion more smoothly when forming the abutment teeth, and to prevent chipping and cracking of the marginal enamel due to fine adjustment of the hand.

[0014]

[Embodiment of the invention]

 Hereinafter, an embodiment of the micro finishing bar of the present invention will be described in detail with reference to the drawings. 2A and 2B are front views of the microfinishing bar according to the embodiment of the present invention. The unit of the dimension shown in the figure is millimeter. It is assumed that the size is not limited to the size shown in the embodiment.

The micro-finishing bar M ₁ shown in FIG. 2A has a cylindrical shape having a slanted surface with an inward tip at the tip of a cylindrical shank a that can be attached to and detached from a high-speed rotator such as an air turbine. A tip portion having a smooth outer peripheral surface is provided, and a smooth surface is provided on the top surface of the tip portion.

[0016] ahead of FIG. 2 (B) micro-finishing bar M ₂ shown in the detachable high speed rotator, such as air turbine columnar handle portion a, a smooth outer peripheral surface tip shape forms a cylindrical It has a shallow groove with a corner on the smooth upper surface at the tip. The shape of the groove is not limited at all as shown in FIGS. 3A to 3E.

The handle of the micro-finishing bar configured as described above is mounted on a high-speed rotator, and the top of the tip of the micro-finishing bar that rotates at high speed is brought into contact with the bottom after the abutment teeth are formed. The smooth surface of the tooth performs extremely minute vibration, and the surface roughness of the tooth that has been subjected to the minute vibration becomes smooth.

In the case where a vertical groove having a shallow bottom and a corner is provided on the upper surface of the distal end portion, an effect of positively generating fine vibration occurs because the upper surface of the rotating distal end becomes discontinuous, It promotes smooth tooth surfaces.

The finish of the bottom portion by the micro-finishing bar has an effect of preventing chipping and cracks from being generated in the enamel, since the impact on the tooth surface is extremely small as compared with the conventional diamond bar. . In addition, since the surface is finished by applying a smooth surface to the tooth surface, the tooth surface is further smoothed.

The shape of the micro-finishing bar is more suitable for the shoulder bottom portion, and is excellent in preventing the occurrence of undercut.

[0021]

[Effect of the invention]

 As described above, according to the microfinishing bar of the present invention, the finishing can be performed only by applying the bar to the tooth surface, so that the finishing of the bottom portion after the formation of the abutment tooth, which requires particularly advanced technology, can be easily performed. became.

Further, since the shape of the bar applied to the tooth surface to be finished is a smooth surface, the bar can be finished more smoothly, and the degree of compatibility with the prosthesis has been increased as compared with before.

Further, since the bar is made of a smooth material and is not provided with blades or abrasive grains, it is possible to prevent chipping and cracking from occurring in the enamel of the teeth.

[0024] Furthermore, when the formation is performed, frictional heat is generated to cause a thermal reaction, but the stimulation by heat is relatively persistent, and it is desirable to avoid it as much as possible in treatment. If a groove b is provided on the top surface of the tip as in the bar of the present invention, air will enter from the minute space of the groove, and if it is formed while applying water, water will enter. The effect of preventing is obtained.

[0025]

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a tip of an extra fine diamond bar.

FIG. 2 is a front view of a main part of a micro finishing bar. B is a front view of the microfinishing bar.

FIG. 3 is a top view of a microfinishing bar.

FIG. 4 is a front view and a top view of a winged carbide bar.

[0026]

[Explanation of symbols]

a shows fine diamond particles finely adhered to the tip of an extra fine diamond bar. b Refers to the groove provided on the upper surface of the micro finishing bar. m Refers to the bevel (inward slope) provided at the tip of the microfinishing bar.

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[Procedure amendment]

[Submission Date] April 13, 2001 (2001.4.1
3)

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

Claims (2)

[Utility model registration claims] 1. A smooth surface is provided on an upper surface of a tip portion having a bevel (inwardly inclined surface) and a smooth outer peripheral surface and having a smooth outer peripheral surface. Micro-finishing bar for shoulder bottom with removable handle. 2. A tip portion having a smooth outer peripheral surface formed in a column shape having a bevel (inwardly inclined surface) in a tip shape.
A shoulder bottom micro-finishing bar having a shallow bottom and a groove having a corner portion on a smooth upper surface portion and a handle portion detachable from a high-speed rotator provided on the opposite side of the tip portion.