JP2008295726A - Preparing method for dental restoration - Google Patents
Preparing method for dental restoration Download PDFInfo
- Publication number
- JP2008295726A JP2008295726A JP2007144859A JP2007144859A JP2008295726A JP 2008295726 A JP2008295726 A JP 2008295726A JP 2007144859 A JP2007144859 A JP 2007144859A JP 2007144859 A JP2007144859 A JP 2007144859A JP 2008295726 A JP2008295726 A JP 2008295726A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- restoration
- shaped body
- dental restoration
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Dental Preparations (AREA)
- Dental Prosthetics (AREA)
Abstract
Description
本発明はセラミック製の歯科用修復物の作製方法に関し、特にラピッドプロトタイピング法を用いたセラミック歯冠修復物の作製方法に関する。 The present invention relates to a method for producing a ceramic dental restoration, and more particularly to a method for producing a ceramic crown restoration using a rapid prototyping method.
近年、審美性等の理由から、金属製の歯冠修復物に代わりセラミック製の歯冠修復物に対する需要が増大している。セラミック製の歯冠修復物の作製には、ＣＡＤ／ＣＡＭシステムが導入されている。ＣＡＤ／ＣＡＭシステムでは、まず、歯列データに基づいてコンピュータ上で歯冠修復物の形状が決定される。続いて、かかる形状に基づいてブロック状のセラミックをドリルで切削し、歯冠修復物が作製される。
しかしながら、セラミックの切削加工は、１つずつ切削するシリアル処理で行われるため、１つの歯冠修復物の作製に２時間程度かかり、製造コストが高くなるという問題があった。
また、ドリルの摩耗により、完成した歯冠修復物の形状が、ＣＡＤ上で設計した歯冠修復物の形状からずれるという問題もあった。
更には、セラミックの切削に用いられるドリルの刃が高価であるという問題もあった。
However, since ceramic cutting is performed by serial processing that cuts one by one, it takes about 2 hours to produce one crown restoration, and there is a problem that the manufacturing cost increases.
In addition, due to wear of the drill, there is a problem that the shape of the completed crown restoration is deviated from the shape of the crown restoration designed on CAD.
Further, there is a problem that a drill blade used for cutting ceramic is expensive.
そこで、本発明は、ラピッドプロトタイピング法を用いて、セラミック製の歯科用修復物を高精度かつ安価に作製する方法を提供することを目的とする。 Accordingly, an object of the present invention is to provide a method for producing a dental restoration made of ceramic with high accuracy and low cost by using a rapid prototyping method.
本発明は、ラピッドプロトタイピング法を用いたセラミック製の歯科用修復物の作製方法であって、
基板を準備する工程と、
基板上に、以下の工程（ａ）、（ｂ）：
（ａ）基板上の上流側から下流側にスキーマを移動させて、光硬化樹脂とセラミックパウダーとを含むスラリーを基板上に塗布する工程、
（ｂ）スラリーの修復物形成部分に光を照射するとともに、修復物形成部分の少なくとも上流側のスラリーにも光を照射して、スラリーを硬化させる工程、
を繰り返し、修復物形成部分に形成された造形体と、少なくともその上流側に形成された造形用ガードとをスラリー中に形成する造形工程と、
硬化せずに残ったスラリーを除去する工程と、
造形体を加熱して造形体を焼結する焼結工程と、
造形体にガラスを浸潤させる浸潤工程とを含むことを特徴とする歯科用修復物の作製方法である。
The present invention is a method for producing a dental restoration made of ceramic using a rapid prototyping method,
Preparing a substrate;
On the substrate, the following steps (a) and (b):
(A) moving the schema from the upstream side to the downstream side on the substrate, and applying a slurry containing a photo-curing resin and ceramic powder on the substrate;
(B) A step of irradiating light on the restoration forming portion of the slurry and irradiating light on at least the upstream side of the restoration forming portion to cure the slurry;
The modeling step of forming the modeling body formed in the restoration forming part and the modeling guard formed at least on the upstream side in the slurry,
Removing the remaining slurry without curing;
A sintering process in which the shaped body is heated to sinter the shaped body;
A method for producing a dental restoration, comprising an infiltration step for infiltrating glass into a shaped body.
本発明にかかる歯科用修復物の作製方法では、十分な強度特性等を備えたセラミック製の歯科用修復物を、欠け等の損傷の発生なく高精度に形成できる。 In the method for producing a dental restoration according to the present invention, a ceramic dental restoration having sufficient strength characteristics and the like can be formed with high accuracy without causing damage such as chipping.
実施の形態１．
本発明の実施の形態１にかかるセラミック製の歯科用修復物の作製方法では、ラピッドプロトタイピング法（Rapid Prototyping Method）が用いられる。
図１は、本実施の形態１にかかる歯科用修復物の作製に用いる紫外線硬化光造形装置（ＣＡＭ装置）の外観であり、図２は装置の内部である。かかる紫外線硬化光造形装置は、ＤＭＥＣ社製の紫外線硬化光造形装置（ＳＣＳ−３００Ｐ）をベースに改造を加えたものである。
Embodiment 1 FIG.
In the method for producing a dental restoration made of ceramic according to the first embodiment of the present invention, a rapid prototyping method is used.
FIG. 1 is an external view of an ultraviolet curing stereolithography apparatus (CAM apparatus) used for producing a dental restoration according to the first embodiment, and FIG. 2 is an inside of the apparatus. Such an ultraviolet curing stereolithography apparatus is a modification based on an ultraviolet curing stereolithography apparatus (SCS-300P) manufactured by DMEC.
紫外線硬化光造形装置では、スキーマを用いて、例えば、紫外線硬化性のスラリーを基板上に一定の膜厚で塗布するとともに、紫外線を照射してスラリーを部分的に硬化させることが可能となる。特に、スラリーには、セラミックを成分としたスラリーを用いることもできる。 In the ultraviolet curing stereolithography apparatus, for example, an ultraviolet curable slurry is applied on a substrate with a certain film thickness using a schema, and the slurry can be partially cured by irradiating ultraviolet rays. In particular, a slurry containing ceramic as a component can also be used as the slurry.
図３は、ラピッドプロトタイピング法を用いた歯科用修復物の作製工程の概略図であり、図２の紫外線硬化光造形装置を、右下から左上の方向に見た場合の概略図である。
本実施の形態１にかかる歯科用修復物の作製方法は、以下の工程１〜７を含む。
FIG. 3 is a schematic view of a production process of a dental restoration using the rapid prototyping method, and is a schematic view when the ultraviolet curing stereolithography apparatus of FIG. 2 is viewed from the lower right to the upper left.
The method for producing a dental restoration according to the first embodiment includes the following steps 1 to 7.
工程１：図３（ａ）に示すように、基板１０を準備する。基板１０は、基板１０上への積層が進むに従って、その積層された厚さずつ下降するようになっている。続いて、スキーマ２０を用いて、コンポジットスラリー３０を基板１０上に塗布する。スキーマ２０は上流側（左側）から下流側（右側）への一方向（Ａの方向）にコンポジットスラリー３０を延ばしながら塗布する。塗布されるコンポジットスラリー３０の膜厚は、基板１０とスキーマ２０との距離により調整できるが、ここでは、１層の膜厚は３０μｍとする。但し、１層の膜厚は３０μｍに限定されるものではない。 Step 1: As shown in FIG. 3A, a substrate 10 is prepared. As the stacking on the substrate 10 progresses, the substrate 10 is lowered by the stacked thickness. Subsequently, the composite slurry 30 is applied onto the substrate 10 using the schema 20. The schema 20 is applied while extending the composite slurry 30 in one direction (direction A) from the upstream side (left side) to the downstream side (right side). The film thickness of the applied composite slurry 30 can be adjusted by the distance between the substrate 10 and the schema 20, but here, the film thickness of one layer is 30 μm. However, the film thickness of one layer is not limited to 30 μm.
コンポジットスラリー３０には、紫外線硬化樹脂とセラミックパウダー（ナノ粒子）の混合物が用いられ、例えば、アクリル系樹脂（ＫＣ１１５９、ＤＭＥＣ社製）と、αアルミナ粒子（平均粒子径０．１７μｍ、大明化学工業製）を、体積比６０／４０で混合したスラリーが好ましい。但し、かかる混合比は６０／４０に限定されるものではない。 For the composite slurry 30, a mixture of an ultraviolet curable resin and ceramic powder (nanoparticles) is used. Made by mixing at a volume ratio of 60/40. However, the mixing ratio is not limited to 60/40.
また、コンポジットスラリー３０には、紫外線硬化樹脂とジルコニア強化アルミナ（ＺＴＡ）を混合したスラリーを用いても構わない。但し、かかる材料はジルコニア強化アルミナ（ＺＴＡ）に限定されるものではない。 The composite slurry 30 may be a slurry in which an ultraviolet curable resin and zirconia reinforced alumina (ZTA) are mixed. However, such a material is not limited to zirconia reinforced alumina (ZTA).
なお、図２は、透明の基板上に、白いコンポジットスラリーが塗布された状態を示している。 FIG. 2 shows a state in which a white composite slurry is applied on a transparent substrate.
工程２：図３（ｂ）に示すように、コンポジットスラリー３０の所定部分に紫外線レーザ（波長：３５５ｎｍ）を照射して、コンポジットスラリー３０を硬化させる。
紫外線レーザを照射する部分は、予め作成された、歯科用修復物と造形用ガードのＣＡＤデータに基づいて決定される。具体的には、歯科用修復物と造形用ガードのＣＡＤ画像を、コンポジットスラリー３０（膜厚３０μｍ）の１層毎に水平分割したＣＡＤデータを作成し、そのデータに基づいて、１層毎に紫外線レーザを照射する。
Step 2: As shown in FIG. 3B, a predetermined portion of the composite slurry 30 is irradiated with an ultraviolet laser (wavelength: 355 nm) to cure the composite slurry 30.
The portion to be irradiated with the ultraviolet laser is determined based on CAD data of the dental restoration and the modeling guard, which are created in advance. Specifically, CAD data is created by horizontally dividing CAD images of dental restorations and modeling guards for each layer of the composite slurry 30 (film thickness 30 μm), and based on the data, for each layer Irradiate with ultraviolet laser.
紫外線レーザが照射された部分は、硬化して造形用ガード３１、造形体３２となる。紫外線レーザが照射されない部分は、コンポジットスラリー３０のまま残る。 The portion irradiated with the ultraviolet laser is cured to become a modeling guard 31 and a modeling body 32. The portion that is not irradiated with the ultraviolet laser remains as the composite slurry 30.
なお、ここでは紫外線を用いてコンポジットスラリー３０を硬化したが、可視光硬化レジンをコンポジットスラリーの材料に用いて、可視光を用いてコンポジットスラリーを硬化させても構わない。また、スラリーの硬化は、インクジェットプリンターによる硬化剤の噴射によっても可能である。 Although the composite slurry 30 is cured here using ultraviolet rays, the composite slurry may be cured using visible light using a visible light curing resin as the material of the composite slurry. The slurry can also be cured by jetting a curing agent with an ink jet printer.
また、紫外線レーザを走査させてコンポジットスラリー３０を硬化する代わりに、例えば、マスクを用いて、所定領域に一度に紫外線を照射して硬化させても構わない。 Further, instead of curing the composite slurry 30 by scanning the ultraviolet laser, for example, using a mask, the predetermined region may be irradiated with ultraviolet rays at once to be cured.
工程３：図３（ｃ）に示すように、工程１と同様に、スキーマ２０でコンポジットスラリー３０を積み重ねて塗布する。塗布するコンポジットスラリー３０の膜厚は、１層目と同じく３０μｍである。
続いて、紫外線レーザを照射して、所定位置のコンポジットスラリー３０を硬化させて造形用ガード３１、造形体３２を形成する。
Step 3: As shown in FIG. 3C, the composite slurry 30 is stacked and applied by the schema 20 in the same manner as in Step 1. The film thickness of the composite slurry 30 to be applied is 30 μm as in the first layer.
Subsequently, the composite slurry 30 at a predetermined position is cured by irradiating an ultraviolet laser to form the modeling guard 31 and the modeling body 32.
２層目のコンポジットスラリー３０をスキーマ２０で塗布する場合、塗布されるコンポジットスラリー３０に押されて、１層目に形成した造形体３２が剥離したり、Ａ方向に位置がずれたりする。特に、クラウン等の歯科用修復物では、下方の厚みが薄く、基板１０から剥離しやすい。 When the second-layer composite slurry 30 is applied with the schema 20, the shaped body 32 formed on the first layer is peeled off or displaced in the A direction by being pushed by the applied composite slurry 30. In particular, a dental restoration such as a crown has a thin lower thickness and is easily peeled off from the substrate 10.
これに対して、本実施の形態１にかかる製造方法では、造形体３２の上流側に造形体ガード３１が形成されているため、上層のコンポジットスラリー３０を塗布する場合に、下層の造形体３２にかかる力が大幅に軽減され、下層の造形体３２の剥離等が防止できる。造形体３２と造形体ガード３１との間隔は、造形体ガード３１の周囲でほぼ等間隔であり、０．１ｍｍ〜１．０ｍｍ程度が好ましく、特に０．５ｍｍ程度が好ましい。 On the other hand, in the manufacturing method according to the first embodiment, the shaped body guard 31 is formed on the upstream side of the shaped body 32. Therefore, when the upper composite slurry 30 is applied, the lower shaped body 32 is formed. Is significantly reduced, and peeling of the lower shaped body 32 can be prevented. The distance between the model body 32 and the model body guard 31 is substantially equal around the model body guard 31, preferably about 0.1 mm to 1.0 mm, and particularly preferably about 0.5 mm.
ここで、造形体ガード３１は、少なくとも造形体３２の上流側に設けられれば、下層の造形体３２の剥離等を防止する効果が得られる。 Here, if the modeling body guard 31 is provided at least on the upstream side of the modeling body 32, an effect of preventing peeling or the like of the lower modeling body 32 can be obtained.
なお、上述のように、クラウン等の歯科用修復物では下方の厚みが薄く、基板１０から造形体３２が剥離しやすい。このため、図３（ｃ）に示すように、造形体３２と造形体ガード３１との間隔は、造形体ガード３１の周囲でほぼ等間隔の０．５ｍｍ程度とすることが好ましい。しかしながら、例えばブロック状の造形体のように、薄い部分の無い形状の場合には、図４に示すような造形体ガード３１を用いてもよい。 Note that, as described above, a dental restoration such as a crown has a thin lower thickness, and the shaped body 32 is easily peeled off from the substrate 10. For this reason, as shown in FIG. 3C, it is preferable that the distance between the modeled body 32 and the modeled body guard 31 is about 0.5 mm that is approximately equal around the modeled body guard 31. However, in the case of a shape having no thin portion, such as a block-shaped shaped body, a shaped body guard 31 as shown in FIG. 4 may be used.
図４において、上図が、造形体３２の周囲に設けられた造形体ガード３１の上面図、下図が造形体ガード３１の側面図である。図４では、左側が、スキーマ２０がコンポジットスラリー３０を塗布する場合の上流側であり、右側が下流側である。 In FIG. 4, the upper diagram is a top view of the modeled body guard 31 provided around the modeled body 32, and the lower diagram is a side view of the modeled body guard 31. In FIG. 4, the left side is the upstream side when the schema 20 applies the composite slurry 30, and the right side is the downstream side.
このように、造形体３２が基板から剥離しにくい形状の場合には、必ずしも造形体３２と造形体ガード３１との間隔を一定にする必要は無く、造形体３２の少なくとも上流側に、図４に示すような造形体ガード３１を設けることにより、良好な造形体３２を形成することができる。 As described above, when the shaped body 32 has a shape that is difficult to peel from the substrate, it is not always necessary to make the distance between the shaped body 32 and the shaped body guard 31 constant. By providing the shaped body guard 31 as shown in FIG. 1, a good shaped body 32 can be formed.
工程４：コンポジットスラリー３０の塗布工程（図３（ａ））と露光硬化工程（図３（ｂ））を繰り返すことにより、図３（ｄ）に示すような、造形体ガード３１、造形体３２が形成される。 Step 4: By repeating the application process (FIG. 3A) and the exposure curing process (FIG. 3B) of the composite slurry 30, a model body guard 31 and a model body 32 as shown in FIG. Is formed.
図５Ａは、図３（ｄ）に対応する、造形体ガード３１および造形体３２のＣＡＤ画像であり、図３（ｄ）を上から見た状態を示す。また、図５Ｂは、図５Ａの構造の上面を削り取った状態であり、造形体ガード３１中に配置された造形体３２を示す。 FIG. 5A is a CAD image of the modeled body guard 31 and the modeled body 32 corresponding to FIG. 3D, and shows a state when FIG. 3D is viewed from above. 5B is a state where the upper surface of the structure of FIG. 5A is scraped off, and shows a shaped body 32 arranged in the shaped body guard 31. FIG.
図６Ａは、工程１〜４により実際に作製した造形体ガード３１および造形体３２の上面写真であり、図６Ｂは、造形体ガード３１を破壊して取り出した造形体３２の上面写真である。造形体３２は、臼歯クラウンである。 FIG. 6A is a top view photograph of the shaped body guard 31 and the shaped body 32 actually produced by steps 1 to 4, and FIG. 6B is a top view photograph of the shaped body 32 taken out by destroying the shaped body guard 31. The shaped body 32 is a molar crown.
図７Ａは、工程１〜４により実際に作製した造形体ガード３１および造形体３２の底面写真であり、図７Ｂは、造形体ガード３１を破壊して取り出した造形体３２の底面写真である。 FIG. 7A is a bottom photograph of the shaped body guard 31 and the shaped body 32 actually produced in steps 1 to 4, and FIG. 7B is a bottom photograph of the shaped body 32 taken out by destroying the shaped body guard 31.
特に、図６Ｂ、図７Ｂから分かるように、スキーマ２０でコンポジットスラリー３０を積層する工程で、造形体３２の下部等が欠け落ちることもなく、ＣＡＤ画像通りの造形体３２が得られていることがわかる。 In particular, as can be seen from FIG. 6B and FIG. 7B, in the step of laminating the composite slurry 30 with the schema 20, the shaped body 32 according to the CAD image is obtained without the bottom of the shaped body 32 being lost. I understand.
なお、図５Ａや図６Ａに示すように、造形体ガード３１の上流側（左側）は、テーパ形状になっているが、このような形状にすることにより、スキーマ２０でコンポジットスラリー３０を塗布する場合の、コンポジットスラリー３０と、下層に形成された造形体ガード３１との抵抗を小さくすることができる。 As shown in FIGS. 5A and 6A, the upstream side (left side) of the shaped body guard 31 has a tapered shape. By using such a shape, the composite slurry 30 is applied with the schema 20. In this case, the resistance between the composite slurry 30 and the shaped body guard 31 formed in the lower layer can be reduced.
工程５：基板１０上のコンポジットスラリー３０を、例えばアルコールやアセトン等の溶剤で溶かして、造形体ガード３１と造形体３２のみとする。
更に、造形体ガード３１を機械的に破壊して、造形体３２を取り出す。例えば、図６Ａに示すように、造形体ガード３１に隙間（横方向に延びた線）ができるように形成すると、造形体ガード３１の取り外しが容易となる。
Step 5: The composite slurry 30 on the substrate 10 is dissolved in, for example, a solvent such as alcohol or acetone, so that only the shaped body guard 31 and the shaped body 32 are obtained.
Further, the model body guard 31 is mechanically destroyed, and the model body 32 is taken out. For example, as shown in FIG. 6A, if the formed body guard 31 is formed so as to have a gap (a line extending in the lateral direction), the formed body guard 31 can be easily removed.
工程６：造形体３２を電気炉に入れて、加熱処理（焼結処理）を行う。加熱処理は、例えば以下の工程（ａ）、（ｂ）からなる。
（ａ）焼却（脱脂）工程： ６００℃×２時間
（ｂ）焼結工程 ：１５００℃×２時間
Step 6: The shaped body 32 is placed in an electric furnace, and heat treatment (sintering treatment) is performed. The heat treatment includes, for example, the following steps (a) and (b).
(A) Incineration (degreasing) step: 600 ° C. × 2 hours (b) Sintering step: 1500 ° C. × 2 hours
工程（ａ）では、造形体３２中のアクリル樹脂成分が焼却されてなくなる。また、工程（ｂ）では、アルミナのナノ粒子同士が焼結される。なお、ここでは、工程（ａ）と工程（ｂ）を、別工程として行ったが、工程（ｂ）の昇温中に、アクリル樹脂の焼却を行うことも可能である。 In the step (a), the acrylic resin component in the shaped body 32 is incinerated. In the step (b), alumina nanoparticles are sintered together. Here, the step (a) and the step (b) are performed as separate steps, but it is also possible to incinerate the acrylic resin during the temperature increase in the step (b).
工程７：加熱処理を行った造形体３２に対して、ガラス浸潤処理を行う。具体的には、例えば、Ｌａ２Ｏ３・Ｂ２Ｏ３・Ａｌ２Ｏ３・ＳｉＯ２系ガラスの粉体に、造形体３２を埋めた状態で、電気炉中で、１１００℃×２時間、加熱処理を行う。
造形体３２を冷やした後、ブラスト処理を行い、表面に付着した余剰のガラスを除去する。以上の工程１〜７により、セラミック製の歯科用修復物が完成する。
Process 7: A glass infiltration process is performed with respect to the modeling body 32 which heat-processed. Specifically, for example, a powder of La 2 O 3 · B 2 O 3 · Al 2 O 3 · SiO 2 -based glass, in a state of filling the shaped body 32, in an electric furnace, 1100 ° C. × 2 hours Then, heat treatment is performed.
After the shaped body 32 is cooled, blasting is performed to remove excess glass adhering to the surface. Through the above steps 1 to 7, a ceramic dental restoration is completed.
図８Ａは、歯科用修復物（臼歯クラウン）のＣＡＤ画像であり、図８Ｂは、本実施の形態１にかかるラピッドプロトタイピング法を用いて作製した、焼結処理前（写真左）、焼結処理後（写真右）の歯科用修復物（造形体）である。 FIG. 8A is a CAD image of a dental restoration (molar crown), and FIG. 8B is a pre-sintering process (left photo), sintering, produced using the rapid prototyping method according to the first embodiment. It is a dental restoration (shaped body) after processing (photo right).
また、図９は、焼結処理前の歯科用修復物（造形体）の上面（左上）、斜視（左下）、底面（右上）の写真であり、図１０は、焼結処理後の歯科用修復物（造形体）の上面（左上）、斜視（左下）、底面（右上）の写真である。 9 is a photograph of the upper surface (upper left), perspective view (lower left), and bottom surface (upper right) of the dental restoration (molded body) before the sintering treatment, and FIG. 10 is a dental view after the sintering treatment. It is a photograph of the upper surface (upper left), perspective view (lower left), and bottom surface (upper right) of the restoration (modeled body).
本実施の形態１にかかる作製方法を用いることにより、ＣＡＤで作製した形状が、再現よく作製できていることがわかる。一方、焼結処理の前後で、造形体の体積が縮小していることも分かる。 By using the manufacturing method according to the first embodiment, it can be seen that the shape manufactured by CAD can be manufactured with good reproducibility. On the other hand, it can also be seen that the volume of the shaped body is reduced before and after the sintering treatment.
焼結処理の前後での、造形体の寸法の変化について調べた結果を以下の表１に示す。焼結処理条件は、上述の工程６に示す工程（ａ）（ｂ）である。 Table 1 below shows the results of examining changes in the dimensions of the shaped body before and after the sintering treatment. Sintering conditions are the steps (a) and (b) shown in step 6 described above.
（表１）
(Table 1)
表１からわかるように、上述の焼結処理条件では、焼結処理の前後において、近遠心方向、頬舌方向に約２３〜２４％、歯軸方向に約２５％、収縮が発生している。歯軸方向の収縮が大きいのは、重力の影響が加わったためと考えられる。 As can be seen from Table 1, in the above-described sintering treatment conditions, before and after the sintering treatment, contraction occurs in the near-centrifugal direction, the buccal tongue direction by about 23 to 24%, and the tooth axis direction by about 25%. . The contraction in the tooth axis direction is considered to be due to the influence of gravity.
このように、焼結処理により、体積収縮が発生するため、かかる収縮率を考慮した上で、ＣＡＤ上で歯科用修復物の設計を行うのが好ましい。 As described above, since the volumetric shrinkage occurs due to the sintering treatment, it is preferable to design a dental restoration on CAD in consideration of the shrinkage rate.
なお、収縮率は、焼結処理条件、特に処理温度に依存するため、焼結処理条件を考慮した上で歯科用修復物の設計を行う必要がある。 Since the shrinkage rate depends on the sintering process conditions, particularly the processing temperature, it is necessary to design a dental restoration in consideration of the sintering process conditions.
次に、１）ラピッドプロトタイピング法による造形後、２）焼結処理後、および３）ガラス浸潤処理後の、造形体の曲げ強度および密度についての実験結果を示す。 Next, experimental results on the bending strength and density of the shaped body after 1) modeling by rapid prototyping, 2) after sintering, and 3) after glass infiltration are shown.
１）ラピッドプロトタイピング法による造形は、７ｍｍ×３ｍｍ×２８ｍｍの平板形状のＣＡＤデータを作成し、かかるデータに基づいてラピッドプロトタイピング法により造形体を作製した。 1) For modeling by the rapid prototyping method, flat plate CAD data of 7 mm × 3 mm × 28 mm was created, and a modeled body was produced by the rapid prototyping method based on such data.
２）焼結処理は、上述の工程６と同様に、
（ａ）焼却（脱脂）工程： ６００℃×２時間
（ｂ）焼結工程 ：１５００℃×２時間
の各工程を行った。
2) The sintering process is the same as in step 6 described above.
(A) Incineration (degreasing) step: 600 ° C. × 2 hours (b) Sintering step: Each step of 1500 ° C. × 2 hours was performed.
３）ガラス浸潤処理は、上述の工程７と同様に、Ｌａ２Ｏ３・Ｂ２Ｏ３・Ａｌ２Ｏ３・ＳｉＯ２系ガラスの粉体に造形体を埋めた状態で、１１００℃×２時間、加熱処理を行った。更に、造形体を冷やした後ブラスト処理を行った。 3) Glass infiltration process, in the same manner as in Step 7 above, in a state of filling the shaped bodies to a powder of La 2 O 3 · B 2 O 3 · Al 2 O 3 · SiO 2 -based glass, 1100 ° C. × 2 Heat treatment was performed for a time. Furthermore, after the shaped body was cooled, blasting was performed.
造形体の曲げ強さは、万能試験機（ＥＺ−Ｔｅｓｔ、島津製作所製）を用い、３点曲げ試験で測定した。また、造形体の密度は、アルキメデス法で計測した。
以下の表２は、造形体の曲げ強さ、密度である。
The bending strength of the shaped body was measured by a three-point bending test using a universal testing machine (EZ-Test, manufactured by Shimadzu Corporation). Further, the density of the shaped body was measured by Archimedes method.
Table 2 below shows the bending strength and density of the shaped body.
（表２）
(Table 2)
１）造形後の曲げ強度は、６．６６±０．４０ＭＰａと小さかったが、３）ガラス浸潤処理後には、１９６．９９±２３．７１ＭＰａとなり、曲げ強度が向上したことがわかる。
また、１）造形後の密度は、２．０９±０．０２ｇ／ｃｍ３であるが、３）ガラス浸潤処理後には、３．７１±０．０５ｇ／ｃｍ３となり、α−アルミナの理論密度である３．９８ｇ／ｃｍ３に近くなっていることがわかる。
1) The bending strength after modeling was as small as 6.66 ± 0.40 MPa, but 3) after the glass infiltration treatment, it was 196.99 ± 23.71 MPa, indicating that the bending strength was improved.
Further, 1) density after shaping is 2.09 is a ± 0.02g / cm 3, 3) after the glass infiltration treatment, 3.71 ± 0.05g / cm 3 next, alpha-alumina of the theoretical density It can be seen that the value is close to 3.98 g / cm 3 .
図１１Ａは、２）焼結処理後の造形体の切断面の顕微鏡写真であり、図１１Ｂは、その拡大写真である。図１１Ｂから分かるように、切断面の表面には、細かいクラックが発生している。また、積層間での剥離が発生するために、曲げ強度も低くなっている FIG. 11A is a photomicrograph of the cut surface of the shaped body after 2) sintering treatment, and FIG. 11B is an enlarged photograph thereof. As can be seen from FIG. 11B, fine cracks are generated on the surface of the cut surface. Also, since peeling occurs between layers, bending strength is also low.
また、図１２Ａは、２）焼結処理後の造形体の曲げ試験後の破面写真であり、図１２Ｂは、３）ガラス浸潤処理後の表面写真である。 Moreover, FIG. 12A is a fracture surface photograph after a bending test of 2) the shaped body after the sintering treatment, and FIG. 12B is a surface photograph after 3) glass infiltration treatment.
２）焼結処理後の造形体では、図１１Ｂに示すように、造形体内に多くのクラックが存在するが、３）ガラス浸潤処理後には、ガラスがクラック内に浸潤することにより、クラックを封止する。これは、例えば、図１２Ａ（ガラス浸潤処理前）と図１２Ｂ（ガラス浸潤処理後）に示す造形体の破面状態からも分かる。 2) In the shaped body after the sintering treatment, as shown in FIG. 11B, there are many cracks in the shaped body. 3) After the glass infiltration treatment, the glass is infiltrated into the crack, thereby sealing the crack. Stop. This can be seen from, for example, the fracture surface state of the shaped body shown in FIG. 12A (before the glass infiltration process) and FIG. 12B (after the glass infiltration process).
以上のように、本発明の実施の形態１にかかるラピッドプロトタイピング法を用いることにより、セラミック製の歯科用修復物を、欠け等の損傷の発生なく形成することができる。 As described above, by using the rapid prototyping method according to the first embodiment of the present invention, a dental restoration made of ceramic can be formed without occurrence of damage such as chipping.
また、強度や密度においても、優れた特性を有する歯科用修復物を得ることができる。 In addition, a dental restoration having excellent characteristics in strength and density can be obtained.
更に、焼結処理条件に応じた収縮率を考慮して歯科用修復物を行うことにより、正確な寸法の歯科用修復物を得ることができる。 Furthermore, a dental restoration having an accurate dimension can be obtained by performing a dental restoration taking into account the shrinkage rate according to the sintering process conditions.
実施の形態２．
図１３は、本実施の形態２にかかるラピッドプロトタイピング法を用いた歯科用修復物の作製工程の概略図である。
Embodiment 2. FIG.
FIG. 13 is a schematic diagram of a production process of a dental restoration using the rapid prototyping method according to the second embodiment.
図１３は、上述の実施の形態１の工程３（図３（ｃ））が終わった後に、１層目の修復物形成部分と２層目の修復物形成部分が重なった部分（基板１０の法線方向から見て重なった部分）に、更に、紫外線レーザや可視光のような光を照射する多重露光工程を示す。 FIG. 13 shows a portion where the first-layer restoration formation portion and the second-layer restoration formation portion overlap each other after the step 3 (FIG. 3C) of the first embodiment is completed. A multiple exposure process in which light such as an ultraviolet laser or visible light is further irradiated on the overlapping portion when viewed from the normal direction is shown.
光は、２層目の修復物形成部分を通り、１層目の修復物形成部分に達するように照射する。かかる光は、１層目の修復物形成部分の底面には達しないようにする。図１３において、破線で囲まれた領域が、光が照射された領域である。 The light is irradiated so as to pass through the second-layer restoration forming portion and reach the first-layer restoration forming portion. Such light is prevented from reaching the bottom surface of the first restoration forming part. In FIG. 13, a region surrounded by a broken line is a region irradiated with light.
スキーマでスラリーを塗布する際、スラリーの粘度によっては、スラリーの表面張力により、下層に積層された層の間の相対的な位置がずれたり、層の間に空気が入る場合がある。 When applying the slurry by the schema, depending on the viscosity of the slurry, the relative position between the layers laminated on the lower layer may be shifted due to the surface tension of the slurry, or air may enter between the layers.
これに対して、本実施の形態２にかかる方法では、２層目に光を照射して修復物形成部分に造形体等を形成した後、更に、１層目と２層目の修復物形成部分が重なった部分に光を照射し、多重露光することにより、１層目と２層目との接着強度を上げている。１層目と２層目の修復物形成部分が重なった部分は、ＣＡＤデータに基づき決定される。 On the other hand, in the method according to the second embodiment, the second layer is irradiated with light to form a modeled body or the like on the restoration formation portion, and then the first and second layer restorations are formed. By irradiating the overlapping part with light and performing multiple exposure, the adhesive strength between the first layer and the second layer is increased. The portion where the first layer and second layer restoration formation portions overlap is determined based on CAD data.
これにより、積層された層間の相対的な位置ずれ等が防止され、より精度の高い歯科用修復物（造形体）の形成が可能となる。 Thereby, the relative position shift etc. between the laminated | stacked layers are prevented and formation of a dental restoration (modeling body) with higher precision is attained.
また、多重露光工程は、造形体の作製だけでなく、造形体ガードの作製に適用しても良い。 Moreover, you may apply a multiple exposure process not only to preparation of a modeling body but to preparation of a modeling body guard.
１０ 基板、２０ スキーマ、３０ コンポジットスラリー、３１ 造形体ガード、３２ 造形体。 10 substrate, 20 schema, 30 composite slurry, 31 shaped body guard, 32 shaped body.
Claims (7)
基板を準備する工程と、
該基板上に、以下の工程（ａ）、（ｂ）：
（ａ）該基板上の上流側から下流側にスキーマを移動させて、光硬化樹脂とセラミックパウダーとを含むスラリーを該基板上に塗布する工程、
（ｂ）該スラリーの修復物形成部分に光を照射するとともに、該修復物形成部分の少なくとも上流側の該スラリーにも光を照射して、該スラリーを硬化させる工程、
を繰り返し、該修復物形成部分に形成された造形体と、少なくともその上流側に形成された造形用ガードとを該スラリー中に形成する造形工程と、
硬化せずに残った該スラリーを除去する工程と、
該造形体を加熱して該造形体を焼結する焼結工程と、
該造形体にガラスを浸潤させる浸潤工程とを含むことを特徴とする歯科用修復物の作製方法。 A method for producing a dental restoration made of ceramic using a rapid prototyping method,
Preparing a substrate;
On the substrate, the following steps (a) and (b):
(A) moving the schema from the upstream side to the downstream side on the substrate, and applying a slurry containing a photocurable resin and ceramic powder on the substrate;
(B) irradiating light to the restoration forming portion of the slurry and irradiating light to at least the upstream side of the restoration forming portion to cure the slurry;
Repeating, and a modeling step of forming in the slurry a modeling body formed in the restoration forming part and a modeling guard formed at least on the upstream side thereof,
Removing the slurry remaining uncured;
A sintering step of heating the shaped body and sintering the shaped body;
A method for producing a dental restoration, comprising an infiltration step of infiltrating the shaped body with glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007144859A JP4978929B2 (en) | 2007-05-31 | 2007-05-31 | How to make a dental restoration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007144859A JP4978929B2 (en) | 2007-05-31 | 2007-05-31 | How to make a dental restoration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2008295726A true JP2008295726A (en) | 2008-12-11 |
| JP4978929B2 JP4978929B2 (en) | 2012-07-18 |
Family
ID=40169831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007144859A Expired - Fee Related JP4978929B2 (en) | 2007-05-31 | 2007-05-31 | How to make a dental restoration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4978929B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101071554B1 (en) | 2010-04-06 | 2011-10-10 | 주식회사 하스 | Manufacturing method of ceramic primary crown and ceramic primary crown manufactured by the method |
| TWI569940B (en) * | 2015-06-05 | 2017-02-11 | 優克材料科技股份有限公司 | Method of manufacturing gradient color slurry and method of molding three dimensional object |
| JP2021506528A (en) * | 2018-01-17 | 2021-02-22 | エイオン カンパニー リミテッド | Artificial tooth molding equipment and its method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102065069B1 (en) * | 2018-05-09 | 2020-01-10 | 이승희 | Device and Method for manufacturing tooth restoration using 3D printer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0812442A (en) * | 1994-06-22 | 1996-01-16 | Toshiba Ceramics Co Ltd | Slurry for ceramic composite material and method for molding the same |
| JPH10244596A (en) * | 1997-03-04 | 1998-09-14 | Rikagaku Kenkyusho | Three-dimensional form-generating method by film lamination forming method and three-dimensional form-generating apparatus thereby |
| JP2001157686A (en) * | 1999-12-02 | 2001-06-12 | Rojitetsuku Kk | Method of manufacturing artificial crown, denture and dental plate by lamination and accumulation method |
| WO2006100964A1 (en) * | 2005-03-18 | 2006-09-28 | Osaka University | Method for producing three-dimensional article and three-dimensional article |
-
2007
- 2007-05-31 JP JP2007144859A patent/JP4978929B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0812442A (en) * | 1994-06-22 | 1996-01-16 | Toshiba Ceramics Co Ltd | Slurry for ceramic composite material and method for molding the same |
| JPH10244596A (en) * | 1997-03-04 | 1998-09-14 | Rikagaku Kenkyusho | Three-dimensional form-generating method by film lamination forming method and three-dimensional form-generating apparatus thereby |
| JP2001157686A (en) * | 1999-12-02 | 2001-06-12 | Rojitetsuku Kk | Method of manufacturing artificial crown, denture and dental plate by lamination and accumulation method |
| WO2006100964A1 (en) * | 2005-03-18 | 2006-09-28 | Osaka University | Method for producing three-dimensional article and three-dimensional article |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101071554B1 (en) | 2010-04-06 | 2011-10-10 | 주식회사 하스 | Manufacturing method of ceramic primary crown and ceramic primary crown manufactured by the method |
| CN102843990A (en) * | 2010-04-06 | 2012-12-26 | 哈斯有限公司 | Preparation method of ceramic crowns for primary teeth, and ceramic crowns for primary teeth prepared thereby |
| US9458062B2 (en) | 2010-04-06 | 2016-10-04 | Hass Co., Ltd. | Method of manufacturing ceramic primary crown and ceramic primary crown manufactured by the same |
| TWI569940B (en) * | 2015-06-05 | 2017-02-11 | 優克材料科技股份有限公司 | Method of manufacturing gradient color slurry and method of molding three dimensional object |
| JP2021506528A (en) * | 2018-01-17 | 2021-02-22 | エイオン カンパニー リミテッド | Artificial tooth molding equipment and its method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4978929B2 (en) | 2012-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Methani et al. | The potential of additive manufacturing technologies and their processing parameters for the fabrication of all‐ceramic crowns: A review | |
| Kessler et al. | 3D printing in dentistry—State of the art | |
| Ishida et al. | Dimensional accuracy of dental casting patterns created by 3D printers | |
| CN113905871B (en) | 3D print object with selective oversolidified regions | |
| Revilla-León et al. | Additive manufacturing technologies for processing zirconia in dental applications | |
| CN115043974A (en) | 3D printing compound made of single resin by patterned exposure | |
| CN106175950B (en) | A kind of digitlization face projects shaped ceramic corona bridge preparation method | |
| CN103637851A (en) | Production of dental prostheses via CAD and rapid manufacturing from digitally recorded oral data | |
| US20100143868A1 (en) | Method for the precise fabrication of dental components using a sintering or selective laser melting process | |
| Katreva et al. | 3D-printing in contemporary prosthodontic treatment | |
| JP2006163370A (en) | Method for making dental model, dental model having ceramic layer deposited on surface thereof, making of dental molding and use of dental model, 3d printer and kit | |
| JP4317027B2 (en) | Methods and compositions for making ceramic parts by stereolithography and applications in the dental field | |
| JP4978929B2 (en) | How to make a dental restoration | |
| Methani et al. | Additive manufacturing in dentistry: current technologies, clinical applications, and limitations | |
| Punia et al. | 3D printable biomaterials for dental restoration: A systematic review | |
| JP2011528597A (en) | Molded member manufactured from shape stabilizing material and method for manufacturing the same | |
| CN108245432B (en) | Additive manufacturing method of all-ceramic dental prosthesis | |
| CN105142568B (en) | The manufacture method of distortionless dentognathic model and the dentognathic model so manufactured for manufacturing | |
| WO2006056980A2 (en) | Method and accessory for preparing a dental crown or bridge | |
| CN110002883A (en) | A kind of polysilazane ceramic of photocuring 3D printing and preparation method thereof | |
| RU2700356C1 (en) | Method of making parts made from ceramic material by additive production technology | |
| Gali et al. | 3D Printing: the future technology in prosthodontics | |
| JP2018047556A (en) | Laminate molding structure, laminate molding method and laminate molding device | |
| EP3870100B1 (en) | 3d-printed dental restoration precursor with support element and process of production | |
| Dikova et al. | Accuracy of polymeric dental bridges manufactured by stereolithography |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20100507 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20100507 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20120315 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20120327 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20120410 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150427 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4978929 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150427 Year of fee payment: 3 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313117 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150427 Year of fee payment: 3 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150427 Year of fee payment: 3 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313117 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313117 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |