JP2012085884A - Dental grinding bar for curving surface - Google Patents
Dental grinding bar for curving surface Download PDFInfo
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本発明は、歯科治療において、支台歯の切端部や咬合面に形成される凸部をなだらかな曲面に形成可能な歯科用研削バーに関するものである。 The present invention relates to a dental grinding bar capable of forming a convex portion formed on a cut end portion or an occlusal surface of an abutment tooth into a gently curved surface in dental treatment.
従来は歯科治療方法として、歯牙の欠損の著しい修復方法の１つとして、歯牙を支台歯と呼ばれる土台に形成し、その支台歯に適合するクラウンと呼ばれる歯冠を作製し接着により治療を行なう方法がある。支台歯の形成には歯科用研削バーが主に使用される。 Conventionally, as a dental treatment method, as one of the remarkable repair methods for tooth defects, teeth are formed on a base called an abutment tooth, and a crown called a crown that fits the abutment tooth is made and treated by adhesion. There is a way to do it. Dental grinding bars are mainly used to form the abutment teeth.
従来は鋳造によって作製された金属製のコアに上部構造を付与したクラウンを用いることが一般的であったが、近年、支台歯形状の電子データを基にCAD/CAM技術を用いてセラミックス製のコアを作製する技術が開発された。即ち、支台歯形状を３Dスキャナで読み取り、その形状からCAD技術を用いてコア成形データを作成し、セラミックス製のブロックを切削してコアを作製し、上部構造を付与する。 In the past, it was common to use a crown with a superstructure added to a metal core produced by casting. However, in recent years, it has been made of ceramics using CAD / CAM technology based on the electronic data of the abutment tooth shape. A technology to fabricate the core was developed. In other words, the abutment tooth shape is read by a 3D scanner, core forming data is created from the shape using CAD technology, a ceramic block is cut to produce a core, and an upper structure is given.
支台歯の形成に使用する歯科用研削バーは主に棒状のシリンダータイプが用いられ、支台歯の切端部については術者の感覚によって研削バーを適度に傾けることに形成を行うため、旧来の支台歯は切端部にステップの発生や角部が形成される傾向にあった。支台歯の切端部が鋭角となった模式図を図１に示す。
近年、支台歯の形状をレーザ等の３Dスキャナーで読み取り、CADでコア形状を設計し、電子データ化してCAMにて支台歯に適合するコアを作製する方法が現れた。
The dental grinding bar used to form the abutment tooth is mainly a rod-shaped cylinder type, and the incisal part of the abutment tooth is formed by tilting the grinding bar appropriately according to the operator's sense. The abutment teeth tended to generate steps and corners at the incision. FIG. 1 shows a schematic diagram in which the cut end portion of the abutment tooth has an acute angle.
In recent years, a method has emerged in which the shape of an abutment tooth is read by a 3D scanner such as a laser, the core shape is designed by CAD, converted into electronic data, and a core suitable for the abutment tooth is produced by CAM.
しかし、支台歯に鋭利な部分やステップが存在すると３Dスキャナーで形状を読み取るときに正確に形状を読み込むことは難しく、正確なCADデータを作製できないことが多く発生した。 However, if there are sharp parts or steps on the abutment tooth, it is difficult to accurately read the shape when reading the shape with a 3D scanner, and it is often impossible to create accurate CAD data.
また、支台歯の鋭利な部分はCAMでの加工時にドリル３がコア形状を過剰に削除してしまい正確にコア形状を再現できない問題が生じる。例えば、図１のコア内形のデータをCAMにて切削すると先端部が、図２の左図の様に切削され、CADデータ形状とCAMデータと大きく隔たった形状となる。そのまま、コアを作製した場合は、右図の様にコアの先端形状と支台歯形状にギャップが生じることがあり、適合性の低下や上部構造物の作製時の厚みが変わることから、その部分の色調や物性への影響が著しく生じる。上部構造物とはコアの上部に天然歯を模倣する為に形成されるものである。
その為、支台歯にクラウンが合わないことや、クラウンに転写された鋭利な部分やステップに応力集中が生じ、破断などがしばしば発生していた。
For this reason, the crown does not fit the abutment tooth, stress concentration occurs in the sharp part or step transferred to the crown, and breakage often occurs.
本発明は、上記従来の問題点を解決することを目的としてなされたものであり、術者の感覚や経験を必要とせず、誰でも確実に支台歯の切端部や咬合面の凸部になだらかで適切な丸みや厚みを付与することが可能となり、３Dスキャナーで形状を読み取りやすく、かつCAMでの加工にも適した支台歯形状に形成可能な歯科用研削バーを提供するものである。
図2の右図は特定の研削プログラムにより作製されたコアであり、先端の内壁形状に合わせて作製されたものであるため、コアの外形に大きく影響し、上部構造の形成に影響する。そのため、色調や物性への影響が著しく生じる。
また、異なるプログラムではコアの先端部に孔が空くこともあり、コアとして利用できないものが作製されることもある。
The present invention has been made for the purpose of solving the above-mentioned conventional problems, and does not require the operator's sense or experience, and anyone can reliably attach to the incisal portion of the abutment tooth or the convex portion of the occlusal surface. Provided with a dental grinding bar that can be gently and appropriately rounded and thickened, can be easily read by a 3D scanner, and can be formed into an abutment tooth shape suitable for machining with a CAM. .
The right figure in FIG. 2 is a core produced by a specific grinding program, and is produced according to the shape of the inner wall of the tip, so it greatly affects the outer shape of the core and affects the formation of the superstructure. As a result, the color tone and physical properties are significantly affected.
Also, in different programs, a hole may be formed at the tip of the core, and a program that cannot be used as a core may be produced.
本発明は電子データを取得する支台歯の頂部形状を形成する支台歯形成用研削バーであって、
回転器具に接続する為の軸部と、軸部の一端に研削体を有する作業部から構成され、
軸部は長さ８〜２５ｍｍ、直径１．６〜２．４ｍｍの円柱状であり、
作業部は軸部を中心とする回転体形状であり、
軸部の中心を通る面で切断した場合の作業部表面の形状は、
中央に凹部を有し、
凹部の谷の部分にある軸部に最も近い最深部８を有し、
凹部の端方向の山の部分にある軸部から最も遠い端方向頂部９を有し、
凹部の軸部方向の山の部分にある軸部から最も遠い軸部方向頂部１０を有し、
最深部と端方向頂部の間および最深部と軸部方向頂部の間は、なだらかな曲線から構成され、
軸部の中心から端方向頂部の長さは０．８〜２．５ｍｍであり、
軸部の中心から軸部方向頂部の長さは０．８〜２．５ｍｍであり、
端方向頂部と軸部方向頂部の長さは２〜４ｍｍであり、
軸部の中心から最深部の長さは０．３〜１．５ｍｍであり、
軸部の中心と最深部の長さと、軸部の中心と端方向頂部との長さの差は０．５〜２ｍｍであり、
軸部の中心と最深部の長さと、軸部の中心と軸部方向頂部との長さの差は０．５〜２ｍｍであり、
端方向頂部と軸部方向頂部の中点を含む軸部の中心に垂直な平面から最深部は１ｍｍ以内に有することを特徴とする支台歯形成用研削バーである。
また、支台歯形成用研削バーであって、軸線の中心を通る面で切断した場合の作業部表面の形状において、
端方向頂部から端部にかけてなだらかな曲線から構成され、
端方向頂部を含む軸部の中心に垂直な平面に有する軸部の中心から端部方向に３ｍｍ以内に端部を有していることを特徴とする支台歯形成用研削バーである。
The present invention is an abutment formation grinding bar for forming the apex shape of an abutment tooth for acquiring electronic data,
Consists of a shaft part for connecting to a rotating device and a working part having a grinding body at one end of the shaft part,
The shaft part has a cylindrical shape with a length of 8 to 25 mm and a diameter of 1.6 to 2.4 mm.
The working part is a rotating body centered on the shaft part,
The shape of the surface of the working part when cut by a plane passing through the center of the shaft part is
Having a recess in the center,
Having the deepest part 8 closest to the shaft part in the valley part of the recess,
Having an end apex 9 that is furthest from the shank at the peak in the end direction of the recess,
It has an axial direction top 10 that is farthest from the axial part at the peak part in the axial direction of the recess,
Between the deepest part and the end direction top part and between the deepest part and the axial direction top part is composed of a gentle curve,
The length from the center of the shaft portion to the end in the end direction is 0.8 to 2.5 mm,
The length from the center of the shaft portion to the top portion in the shaft portion direction is 0.8 to 2.5 mm,
The length of the end direction apex and the axial direction apex is 2 to 4 mm,
The length of the deepest part from the center of the shaft part is 0.3 to 1.5 mm,
The difference between the length of the center and the deepest part of the shaft part and the length of the center of the shaft part and the top in the end direction is 0.5 to 2 mm,
The difference between the length of the center of the shaft portion and the deepest portion and the length of the center of the shaft portion and the top of the shaft portion direction is 0.5 to 2 mm,
An abutment-forming grinding bar characterized in that the deepest part is within 1 mm from a plane perpendicular to the center of the shaft part including the midpoint of the end direction top part and the axial direction top part.
In addition, the abutment tooth forming grinding bar, in the shape of the working portion surface when cut by a plane passing through the center of the axis,
Consists of a gentle curve from the top to the end
An abutment-forming grinding bar having an end portion within 3 mm in the end direction from the center of the shaft portion on a plane perpendicular to the center of the shaft portion including the top portion in the end direction.
本発明に係る歯科用研削バーを使用することによって、従来術者の感覚や経験則で行なっていた支台歯の切端部や咬合面の凸部の形成を術者の感覚や経験を問わずにステップの発生や角部が形成されない理想的な厚みと丸みを帯びた支台歯を確実に形成することが可能となる。
また、本発明の歯科用研削バーを用いて支台歯を形成することによってなだらかで適切な丸みや厚みを確保することが可能となり３Dスキャナーで形状を読み取るときに正確に形状を読み込むことができる。
また、適切な丸みや厚みを有するなだらかな支台歯を形成することによりCAMで精度の高い加工が可能となる。
課題に記載した問題点も解決することができる。
By using the dental grinding bar according to the present invention, it is possible to form the incisal portion of the abutment tooth and the convex portion of the occlusal surface, which has been conventionally performed according to the operator's sense and experience rule, regardless of the operator's sense and experience. Therefore, it is possible to reliably form an abutment tooth having an ideal thickness and roundness in which no step or corner portion is formed.
Further, by forming the abutment tooth using the dental grinding bar of the present invention, it is possible to ensure a smooth and appropriate roundness and thickness, and it is possible to accurately read the shape when reading the shape with a 3D scanner. .
Further, by forming a gentle abutment tooth having an appropriate roundness and thickness, high-precision processing can be performed with CAM.
The problem described in the problem can also be solved.
本発明に係る使用方法は、歯科用ハンドピースに取り付け回転させた歯科用研削バーの中央凹部を歯牙の支台歯形成における切端部や咬合面の凸部に撫でる様に押し当て、好ましい支台歯の形状を確実に形成できるものである。 The method of use according to the present invention is to press the central concave portion of the dental grinding bar attached to the dental handpiece and rotate it so as to stroke the cut end portion or convex portion of the occlusal surface in the formation of the tooth abutment tooth. The tooth shape can be reliably formed.
本歯科用研削バーの作業部は歯科用ダイヤモンドバーやカーバイド製の切削器具である歯科用カーバイドバー以外にも焼結ダイヤモンドやビトリファイド砥石、ゴム砥石等でも可能であるが、歯科用ダイヤモンドバーであることが好ましい。 The working part of this dental grinding bar can be a sintered diamond, a vitrified grinding wheel, a rubber grinding wheel, etc. in addition to a dental diamond bar or a dental carbide bar which is a cutting tool made of carbide. It is preferable.
本歯科用研削バーの最良の形態を示す。
軸部は長さ８〜２５ｍｍ、好ましくは１０〜１８ｍｍ、直径１．６〜２．４ｍｍの円柱状、好ましくは１．６ｍｍと２．３５ｍｍである。長さが８ｍｍ以下の場合は、装着して使用する歯科用ハンドピースに装着できなく、１８ｍｍ以上ではバーが長すぎるため口腔内で取扱が困難な上、使用時に破折の可能性が高くなる。太さが１．６ｍｍ以下の場合と２．４ｍｍ以上の場合は、歯科用ハンドピースに装着できない。
作業部は軸部を中心とする回転体形状である。
軸部の中心を通る面で切断した場合の作業部表面の形状は、どの面で切ったとしても、同一形状となる。即ち、本発明の研削バーは前述の通り、回転体形状をしており、回転器具に軸部を接続し回転させることにより、研削部の表層が被研削体に接触し、移動させることにより表層が連続して被研削体に接触する為に、被研削体表面がなだらかな仕上がりとなる。
軸部の中心から端方向頂部は０．８〜２．５ｍｍ、好ましくは１〜２ｍｍである。０．８ｍｍ以下の場合は、頂部が低くなり、支台歯の切端部や咬合面の凸部の先端が平らに形成されるために適切な丸みを付与できず、２．５ｍｍ以上では作業部が大きくなり過ぎるため作業性が低下する。
軸部の中心から軸部方向頂部は０．８〜２．５ｍｍであり、好ましくは１〜２ｍｍである。０．８ｍｍ以下の場合は、頂部が低くなり、支台歯の切端部や咬合面の凸部の先端が平らに形成されるために適切な丸みを付与できず、２．５ｍｍ以上では作業部が大きくなり過ぎるため作業性が低下する。
端方向頂部と軸部方向頂部は２〜４ｍｍであり、好ましくは２．５〜３．５ｍｍである。２ｍｍ以下の場合は、凹部の幅が狭くなり、支台歯の切端に厚みが確保できず、４ｍｍ以上では支台歯の切端部や咬合面の凸部の先端が平らに形成されるために適切な丸みを付与できない。
軸部の中心から最深部の長さは０．３〜１．５ｍｍであり、好ましくは０．５〜１ｍｍである。０．３ｍｍ以下の場合は、作業部が細くなり安全性が低下し、１．５ｍｍ以上では作業部が大きくなり過ぎるため作業性が低下する。最深部と軸部の中心の長さは短すぎると作業部が細くなって強度が低下し、使用時に凹部が破折する可能性がある。また、長すぎると作業部全体が大きくなり、作業部と軸部の境界で破折する可能性が高いことと、口腔内での作業性が著しく低下する。
軸部の中心と最深部の長さと、軸部と端方向頂部との長さの差は０．５〜２．０ｍｍである。０．５ｍｍ以下の場合は、支台歯の切端部や咬合面の凸部の先端が平らに形成されるために適切な丸みを付与できず、２．０ｍｍ以上では作業部が大きくなり過ぎるため作業性が低下する。
軸部の中心と最深部の長さと、軸部の中心と軸部方向頂部との長さの差は０．５〜２．０ｍｍである。０．５ｍｍ以下の場合は、支台歯の切端部や咬合面の凸部の先端が平らに形成されるために適切な丸みを付与できず、２．０ｍｍ以上では作業部が大きくなり過ぎるため作業性が低下する。
軸部方向頂部と端方向頂部の中点を含む軸部の中心に垂直な平面から最深部は１ｍｍ以内好ましくは、０．５ｍｍ以内である。１ｍｍ以上では凹部の形状がいびつとなり、支台歯の丸みに歪さを帯びた支台歯を形成することになり、支台歯に厚みや丸みを形成することが難しくなる。
端方向頂部から端部にかけて、なだらかな曲線や直線の組合せで構成される。
端方向頂部を含む軸部の中心に垂直な平面に有する軸部の中心から端部方向に３ｍｍ以内に端部を有している。３ｍｍを越えると臼歯については１歯につき凸部の咬頭を２箇所有するため、一方の咬頭を形成する際にもう一方の咬頭を研削バーの先端が接触してしまうことがある為好ましくない。
1 shows the best form of the dental grinding bar.
The shaft portion has a length of 8 to 25 mm, preferably 10 to 18 mm, and a cylindrical shape with a diameter of 1.6 to 2.4 mm, preferably 1.6 mm and 2.35 mm. When the length is 8 mm or less, it cannot be attached to the dental handpiece to be used. When the length is 18 mm or more, the bar is too long so that it is difficult to handle in the oral cavity and the possibility of breakage during use increases. . When the thickness is 1.6 mm or less and 2.4 mm or more, it cannot be attached to the dental handpiece.
The working part has a rotating body shape centered on the shaft part.
The shape of the surface of the working portion when cut along a plane passing through the center of the shaft portion is the same regardless of which plane is cut. That is, as described above, the grinding bar of the present invention has a rotating body shape, and the surface layer of the grinding part is brought into contact with the object to be ground and moved by connecting the shaft part to the rotating tool and rotating the surface part. Since the material continuously contacts the object to be ground, the surface of the object to be ground has a smooth finish.
The top in the end direction from the center of the shaft portion is 0.8 to 2.5 mm, preferably 1 to 2 mm. In the case of 0.8 mm or less, the top portion is lowered, and the cut end portion of the abutment tooth or the tip of the convex portion of the occlusal surface is formed flat, so that appropriate roundness cannot be given. The workability is reduced because of an excessively large value.
The top in the axial direction from the center of the axial part is 0.8 to 2.5 mm, preferably 1 to 2 mm. In the case of 0.8 mm or less, the top portion is lowered, and the cut end portion of the abutment tooth or the tip of the convex portion of the occlusal surface is formed flat, so that appropriate roundness cannot be given. The workability is reduced because of an excessively large value.
The top in the end direction and the top in the axial direction are 2 to 4 mm, preferably 2.5 to 3.5 mm. When the width is 2 mm or less, the width of the concave portion becomes narrow, and the thickness of the cut end of the abutment tooth cannot be secured. When the length is 4 mm or more, the tip end of the abutment tooth and the convex portion of the occlusal surface are formed flat. Appropriate roundness cannot be given.
The length of the deepest part from the center of the shaft part is 0.3 to 1.5 mm, preferably 0.5 to 1 mm. When the thickness is 0.3 mm or less, the working portion becomes thin and the safety is lowered. When the thickness is 1.5 mm or more, the working portion becomes too large and the workability is lowered. If the length of the center of the deepest part and the shaft part is too short, the working part becomes thin and the strength decreases, and the concave part may break during use. On the other hand, if the length is too long, the entire working part becomes large, and there is a high possibility that the working part breaks at the boundary between the working part and the shaft part.
The difference between the length of the center of the shaft portion and the deepest portion and the length of the shaft portion and the top portion in the end direction is 0.5 to 2.0 mm. If it is 0.5 mm or less, the cutting edge of the abutment tooth and the tip of the convex part of the occlusal surface are formed flat, so that appropriate roundness cannot be imparted, and if it is 2.0 mm or more, the working part becomes too large. Workability is reduced.
The difference in length between the center of the shaft portion and the deepest portion and the length between the center of the shaft portion and the top portion in the shaft portion direction is 0.5 to 2.0 mm. If it is 0.5 mm or less, the cutting edge of the abutment tooth and the tip of the convex part of the occlusal surface are formed flat, so that appropriate roundness cannot be imparted, and if it is 2.0 mm or more, the working part becomes too large. Workability is reduced.
The deepest part is within 1 mm, preferably within 0.5 mm from the plane perpendicular to the center of the axial part including the midpoint of the axial direction apex and the end apex. If the thickness is 1 mm or more, the shape of the recess becomes irregular, and the abutment tooth having a rounded abutment tooth is formed, making it difficult to form a thickness or roundness on the abutment tooth.
It is composed of a combination of gentle curves and straight lines from the top in the end direction to the end.
An end portion is provided within 3 mm in the end direction from the center of the shaft portion in a plane perpendicular to the center of the shaft portion including the top portion in the end direction. If it exceeds 3 mm, the molar tooth has two convex cusps per tooth, which is not preferable because the tip of the grinding bar may come into contact with the other cusp when forming one cusp.
以下図面に基づいて本発明の好ましい実施形態を詳述する。
図３は臼歯の頬側咬頭を本発明の研削バーで形成している状態の概略図である。臼歯の切削は回転器具に接続された研削バーを頬側から舌側へ差し入れ、研削材の最深部が咬頭に当たる様に研削を行う。研削は咬頭の峰沿いに行う。同様に舌側も頬側から研削を行う。上下顎同様に研削を行う。このことから中央窩に接する部分の端方向頂部と軸部方向端部の形状が同一であることが好ましい。
図４は中切歯切端を本発明の研削バーで整形している状態の概略図である。臼歯と同様に研削は回転器具に接続された研削バーを唇側から口腔内へ差し入れ、研削材の最深部が切端に当たる様に研削を行う。研削は咬頭の峰沿いに行う。
臼歯については１歯につき凸部の咬頭を２箇所有するため、一方の咬頭を形成する際にもう一方の咬頭を研削バーの先端が接触してしまうことから、先端部は端方向頂部を含む軸部の中心に垂直な平面に有する軸部の中心から端部方向に３ｍｍ以下に窄まる形状であることが好ましい。
図５は本発明の研削バーで中切歯切端を成形し、クラウンを装着した概念図である。図で示す通り、クラウンとの適合もよく、先端部におけるクラウンと支台歯も適合している。
図６は本発明に係る歯科用研削バーの一例を示す正面図である。それぞれ歯牙の研削を行う作業部５と歯科用ハンドピースに装着して回転を与える軸部６からなる。
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 3 is a schematic view showing a state where the buccal cusp of the molar tooth is formed by the grinding bar of the present invention. For the cutting of molars, a grinding bar connected to a rotating device is inserted from the buccal side to the lingual side, and grinding is performed so that the deepest part of the abrasive material hits the cusp. Grind along the peak of the cusp. Similarly, the lingual side is ground from the cheek side. Grind like the upper and lower jaws. From this, it is preferable that the shape of the end direction top part of the part which contact | connects a central fovea and an axial direction direction edge part is the same.
FIG. 4 is a schematic view showing a state in which the central incisor cut end is shaped by the grinding bar of the present invention. As with molars, grinding is performed such that a grinding bar connected to a rotating device is inserted into the oral cavity from the lip side so that the deepest part of the abrasive material hits the cut edge. Grind along the peak of the cusp.
As for molars, since there are two convex cusps per tooth, the tip of the grinding bar comes into contact with the other cusp when forming one cusp. It is preferable that the shape is constricted to 3 mm or less from the center of the shaft part in the plane perpendicular to the center of the part in the end direction.
FIG. 5 is a conceptual diagram in which a middle incisor cut end is formed with the grinding bar of the present invention and a crown is mounted. As shown in the figure, the fitting with the crown is good, and the crown and the abutment tooth at the tip are also fitted.
FIG. 6 is a front view showing an example of a dental grinding bar according to the present invention. Each includes a working part 5 for grinding teeth and a shaft part 6 which is attached to a dental handpiece and imparts rotation.
図７は本実施形態における歯科用研削バーであり、本発明に係る歯科用研削バーの一例を示す作業部を拡大した断面図である。作業部内部には金属製の母材があり、表面にダイヤモンド粒子を電着した構造を有している。 FIG. 7 shows a dental grinding bar according to this embodiment, and is an enlarged cross-sectional view of a working portion showing an example of a dental grinding bar according to the present invention. There is a metal base material inside the working part, and it has a structure in which diamond particles are electrodeposited on the surface.
作業部５の大きさが大きすぎると口腔内での作業性が低下し、隣在する歯を傷つける恐れが生じる。また小さすぎると曲面が小さくなり、目的の形状が得られない。
従って、最適な軸部の端から作業部先端までの全長は１８〜２２ｍｍであり、作業部５の軸部との移行部から作業部先端までの全長は４〜７ｍｍとなる。
If the size of the working part 5 is too large, the workability in the oral cavity is lowered, and the adjacent teeth may be damaged. If it is too small, the curved surface becomes small and the desired shape cannot be obtained.
Therefore, the total length from the end of the optimum shaft portion to the tip of the working portion is 18 to 22 mm, and the total length from the transition portion with the shaft portion of the working portion 5 to the tip of the working portion is 4 to 7 mm.
図８は本実施形態における歯科用研削バーの一例を示す図で、図７の作業部を断面として拡大し、軸部の中心に沿った回転体であることから、軸部の中心に沿った断面図の一部を示すものである。
２２は軸部の中心から最深部の長さである。２３は軸部の中心から端方向頂部の長さである。２４は軸部の中心から軸部方向頂部の長さである。２５は端方向頂部と軸部方向頂部の中点を含む軸部の中心に垂直な平面から最深部は１ｍｍ以内を示す範囲である。２６は軸部の中心と最深部の長さと、軸部の中心と端方向頂部との長さの差である。２７は軸部の中心と最深部の長さと、軸部の中心と軸部方向頂部との長さの差である。２８は端方向頂部を含む軸部の中心に垂直な平面に有する軸部の中心から端部の長さである。
FIG. 8 is a diagram showing an example of a dental grinding bar in the present embodiment. The working portion of FIG. 7 is enlarged as a cross section, and is a rotating body along the center of the shaft portion. A part of sectional view is shown.
22 is the length of the deepest part from the center of the shaft part. Reference numeral 23 denotes the length from the center of the shaft portion to the top in the end direction. Reference numeral 24 denotes the length from the center of the shaft portion to the top in the shaft portion direction. Reference numeral 25 denotes a range in which the deepest portion is within 1 mm from a plane perpendicular to the center of the shaft portion including the midpoint of the end direction top portion and the axial direction top portion. Reference numeral 26 denotes a difference in length between the center of the shaft portion and the deepest portion, and a length between the center of the shaft portion and the top in the end direction. Reference numeral 27 denotes a difference in length between the center of the shaft portion and the deepest portion, and a length between the center of the shaft portion and the top portion in the shaft portion direction. Reference numeral 28 denotes the length from the center of the shaft portion to the end portion in a plane perpendicular to the center of the shaft portion including the top in the end direction.
作業部については、先端部以外は鋭角部を作らず、曲面若しくは平面で構成することにより、あやまって歯牙に研削バーが当たっても支台歯に鋭角部を形成しない為、良好である。
また、作業部先端に曲面を付与することにより、先端の曲面で支台歯の角やステップを丸めることが可能となる。
The working part is good because it does not form an acute angle part other than the tip part, and is composed of a curved surface or a flat surface, so that even if the grinding bar hits the tooth accidentally, the acute angle part is not formed on the abutment tooth.
Further, by providing a curved surface at the distal end of the working unit, it is possible to round off the corners and steps of the abutment tooth with the curved surface at the distal end.
なお、作業部の材質は電着されたダイヤモンド、シンターダイヤモンド、カーバイドまたはスチール製の切削器具、もしくはビトリファイド系砥石やゴム砥石で作製可能であり、それぞれ適した砥粒や粒度、刃先を選択することができる。 The material of the working part can be made with electrodeposited diamond, sinter diamond, carbide or steel cutting tool, vitrified grinding wheel or rubber grinding wheel, and select the appropriate abrasive grain, grain size and cutting edge respectively. Can do.
上記のような歯科用研削バーを用いて歯牙の支台歯形成における切端部や咬合面の凸部の形成を行う手順を例示すると次のようになる。通法により支台歯の軸面を形成し、最後に切端部や咬合面の凸部に作業部の凹部を当て研削することにより、なだらかな曲面を有する支台歯を形成することが可能となる。 The procedure for forming the cut end and the convex portion of the occlusal surface in the preparation of the tooth abutment using the dental grinding bar as described above is as follows. It is possible to form an abutment tooth with a gentle curved surface by forming the axial surface of the abutment tooth by the usual method and finally grinding by applying the concave part of the working part to the cut part and the convex part of the occlusal surface Become.
本発明は歯科用研削バーであり、産業上利用される。
The present invention is a dental grinding bar and is used industrially.
１ 支台歯
２ コア
３ ＣＡＭドリル
４ セラミックス製のブロック
５ 作業部
６ 軸部
７ ダイヤモンドの電着層
８ 最深部
９ 端方向頂部
１０ 軸方向頂部
１１ ギャップ
１２ クラウン
１７ 臼歯の頬側咬頭
１８ 中切歯切端
１９ 作業部の母材
２２ 軸部の中心から最深部の長さ
２３ 軸部の中心から端方向頂部の長さ
２４ 軸部の中心から軸部方向頂部の長さ
２５ 端方向頂部と軸部方向頂部の中点を含む軸部の中心に垂直な平面から最深部は１ｍｍ以内を示す範囲
２６ 軸部の中心と最深部の長さと、軸部の中心と端方向頂部との長さの差
２７ 軸部の中心と最深部の長さと、軸部の中心と軸部方向頂部との長さの差
２８ 端方向頂部を含む軸部の中心に垂直な平面に有する軸部の中心から端部の長さ
DESCRIPTION OF SYMBOLS 1 Abutment tooth 2 Core 3 CAM drill 4 Ceramic block 5 Working part 6 Shaft part 7 Diamond electrodeposition layer 8 Deepest part 9 End direction top part 10 Axial top part 11 Gap 12 Crown 17 Buccal cusp 18 of the molar Gear cutting edge 19 Base material 22 of working part Length from shaft center to deepest part 23 Shaft center to end direction apex length 24 Shaft part center to axial part apex length 25 End direction apex and shaft The range in which the deepest part is within 1 mm from the plane perpendicular to the center of the shaft part including the midpoint of the axial top part 26 The length of the center of the axial part and the deepest part, and the length of the center of the axial part and the top part in the end direction Difference 27 Difference in length between the center of the shaft portion and the deepest portion, and the length between the center of the shaft portion and the top portion in the axial direction 28 End from the center of the shaft portion having a plane perpendicular to the center of the shaft portion including the top portion in the end direction Department length
Claims (2)
回転器具に接続する為の軸部６と、軸部の一端に研削体を有する作業部５から構成され、
軸部６は長さ８〜２５ｍｍ、直径１．６〜２．４ｍｍの円柱状であり、
作業部５は軸部６を中心とする回転体形状であり、
軸部の中心を通る面で切断した場合の作業部表面の形状は、
中央に凹部を有し、
凹部の谷の部分にある軸部に最も近い最深部８を有し、
凹部の端方向の山の部分にある軸部から最も遠い端方向頂部９を有し、
凹部の軸部方向の山の部分にある軸部から最も遠い軸部方向頂部１０を有し、
最深部と端方向頂部の間および最深部と軸部方向頂部の間は、なだらかな曲線から構成され、
軸部の中心から端方向頂部の長さは０．８〜２．５ｍｍであり、
軸部の中心から軸部方向頂部の長さは０．８〜２．５ｍｍであり、
端方向頂部と軸部方向頂部の長さは２〜４ｍｍであり、
軸部の中心から最深部の長さは０．３〜１．５ｍｍであり、
軸部の中心と最深部の長さと、軸部の中心と端方向頂部との長さの差は０．５〜２ｍｍであり、
軸部の中心と最深部の長さと、軸部の中心と軸部方向頂部との長さの差は０．５〜２ｍｍであり、
端方向頂部と軸部方向頂部の中点を含む軸部の中心に垂直な平面から最深部は１ｍｍ以内に有することを特徴とする支台歯形成用研削バー。
An abutment-forming grinding bar that forms the top shape of the abutment tooth 1 for acquiring electronic data,
It is composed of a shaft portion 6 for connecting to a rotating device, and a working portion 5 having a grinding body at one end of the shaft portion,
The shaft portion 6 has a cylindrical shape with a length of 8 to 25 mm and a diameter of 1.6 to 2.4 mm.
The working part 5 has a rotating body shape with the shaft part 6 as the center,
The shape of the surface of the working part when cut by a plane passing through the center of the shaft part is
Having a recess in the center,
Having the deepest part 8 closest to the shaft part in the valley part of the recess,
Having an end apex 9 that is furthest from the shank at the peak in the end direction of the recess,
It has an axial direction top 10 that is farthest from the axial part at the peak part in the axial direction of the recess,
Between the deepest part and the end direction top part and between the deepest part and the axial direction top part is composed of a gentle curve,
The length from the center of the shaft portion to the end in the end direction is 0.8 to 2.5 mm,
The length from the center of the shaft portion to the top portion in the shaft portion direction is 0.8 to 2.5 mm,
The length of the end direction apex and the axial direction apex is 2 to 4 mm,
The length of the deepest part from the center of the shaft part is 0.3 to 1.5 mm,
The difference between the length of the center and the deepest part of the shaft part and the length of the center of the shaft part and the top in the end direction is 0.5 to 2 mm,
The difference between the length of the center of the shaft portion and the deepest portion and the length of the center of the shaft portion and the top of the shaft portion direction is 0.5 to 2 mm,
A grinding bar for forming an abutment tooth, wherein the deepest portion is within 1 mm from a plane perpendicular to the center of the shaft portion including the midpoint of the end direction top portion and the axial direction top portion.
端方向頂部から端部にかけてなだらかな曲線から構成され、
端方向頂部を含む軸部の中心に垂直な平面に有する軸部の中心から端部方向に３ｍｍ以内に端部を有していることを特徴とする支台歯形成用研削バー。
The abutment tooth forming grinding bar according to claim 1, wherein in the shape of the working portion surface when cut by a plane passing through the center of the axis,
Consists of a gentle curve from the top to the end
An abutment tooth forming grinding bar having an end portion within 3 mm from the center of the shaft portion in a plane perpendicular to the center of the shaft portion including the top portion in the end direction.
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| EP3363403A1 (en) * | 2017-02-15 | 2018-08-22 | Gebr. Brasseler GmbH & Co. KG | Dental instrument, in particular for the preparation of occlusal surfaces |
| WO2020004370A1 (en) * | 2018-06-25 | 2020-01-02 | マニー株式会社 | Bar for forming central fovea |
| WO2020004372A1 (en) * | 2018-06-25 | 2020-01-02 | マニー株式会社 | Bar for forming occlusal surfaces |
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| EP3363403A1 (en) * | 2017-02-15 | 2018-08-22 | Gebr. Brasseler GmbH & Co. KG | Dental instrument, in particular for the preparation of occlusal surfaces |
| WO2020004370A1 (en) * | 2018-06-25 | 2020-01-02 | マニー株式会社 | Bar for forming central fovea |
| WO2020004372A1 (en) * | 2018-06-25 | 2020-01-02 | マニー株式会社 | Bar for forming occlusal surfaces |
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