JP4282794B2 - Silicone impression material for occlusal measurement - Google Patents

Description

【００２１】
この表１から明らかなように、本発明に係る咬合関係計測用シリコーン印象材は、レーザ変位計による測定誤差が市販の咬合採得用印象材に比べて極めて小さく、咬合面形状や対合歯との位置関係を精度良く正確に測定できることが確認された。また、比較例に比べて硬度も高く、切削性も良好であった。
【００２２】
【発明の効果】
以上に詳述した如く、本発明に係る咬合関係計測用シリコーン印象材は、レーザ変位計による測定誤差が極めて小さく、咬合面形状や対合歯との位置関係を精度良く正確に測定できるものであり、更に硬度も高く、切削性も良好である。
従って、この本発明に係る咬合関係計測用シリコーン印象材を用いて測定したデータに基づいて患者の口腔内の咬合関係をコンピュータ画面上に再現することによって、正確で精度の良い咬合関係を再現することが可能となり、ひいては適合精度や咬合状態に優れた歯科用補綴物を得ることが可能となるのであり、歯科界に貢献する価値は非常には大きなものである。[0001]
BACKGROUND OF THE INVENTION
The present invention is used to accurately reproduce a positional relationship between a patient's occlusal surface shape and a pair of teeth when a dental prosthesis such as a crown or a bridge is produced by a CAD / CAM system. The present invention relates to a silicone impression material for occlusal measurement.
[0002]
[Prior art]
Conventionally, dental prostheses such as crowns and bridges have been produced by a lost wax precision casting method using a dental alloy. However, in recent years, aesthetics have been regarded as important, and dental prostheses having a color tone close to that of natural teeth have been demanded. Therefore, the production of dental prostheses using ceramic materials is required. In particular, a method of producing a dental prosthesis by using a ceramic block and designing and cutting and / or grinding on a computer screen ( The production of dental prostheses using a so-called CAD / CAM system has attracted attention.
[0003]
In the preparation of dental prostheses by this CAD / CAM system, an impression is usually taken from the oral cavity of a patient who has formed an abutment tooth, and after making a plaster model based on this impression, the shape of the plaster model is changed to a laser. Reproduce the patient's intraoral shape on the computer screen by measuring with a displacement meter, etc., design the shape of the crown or bridge on the reproduction screen, and NC control cutting and / or grinding based on the obtained design data It is carried out by a method of producing a dental prosthesis by cutting a ceramic block with a processing machine.
Therefore, in order to obtain a highly accurate dental prosthesis, it is important how the intraoral shape of the patient can be accurately reproduced on the computer screen. In particular, it is very difficult to reproduce the occlusal relationship with the paired teeth, and errors are likely to occur. This greatly affects the fitting accuracy and occlusal state of the finally produced dental prosthesis. In other words, the positional relationship with the paired teeth is reproduced based on the positional relationship of the upper and lower jaw dentitions by matching the reference points provided on the upper and lower jaw plaster models. This is not a measurement of the positional relationship with the teeth, and the setting of the reference point itself is performed on the model, so that errors are likely to occur.
[0004]
[Problems to be solved by the invention]
Therefore, the present invention has developed a material capable of directly grasping and measuring the occlusal relationship with the counter tooth where the error is most likely to occur when reproducing the intraoral shape of the patient on the computer screen. It is an object of the present invention to reproduce not only the relationship but also the occlusal surface shape of the opposing teeth with high accuracy and to make it possible to produce a dental prosthesis excellent in conformity accuracy and occlusal state.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have determined that the occlusal relationship such as the occlusal surface shape and positional relationship of the counter teeth is a wax or silicone impression material when a denture is produced using a conventional articulator. Focusing on the fact that it is adjusted by the check bite method using, we examined the application of this method when reproducing the oral cavity of a patient on a computer screen. That is, the occlusal surface shape and positional relationship of the upper and lower jaws on the computer screen displayed based on the measurement data of the gypsum model, the occlusal surface shape of the impression surface and the position of the contact point, etc. obtained in the same manner as the check bite method We studied to display occlusal relationships such as occlusal surface shape and positional relationship more accurately and accurately by measuring and adjusting / correcting the relationship precisely. However, the conventional silicone impression material is affected by ambient light when measured with a laser displacement meter, and the measurement error increases, and because it is flexible, it can be easily deformed when the excess part is removed. It was impossible. Therefore, we developed a silicone impression material for occlusion-related measurement that gave performance suitable for measurement with a laser displacement meter, and using this developed impression material, the abutment tooth formation surface part and the counter tooth occlusion surface part Take the impression (bite) at the time of occlusion, then put the impression (bite) on the abutment tooth forming part of the plaster model, and measure the shape and positional relationship of the occlusal occlusal surface marked on the impression (bite) By adjusting and correcting the occlusal relationship in the oral cavity of the patient based on the obtained data, it is possible to reproduce the accurate and accurate occlusal relationship on the computer screen.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
That is, the silicone impression material for occlusal measurement of the present invention is
A) 100 parts by weight of an organopolysiloxane having at least two aliphatic unsaturated hydrocarbons in one molecule and having a viscosity of 50 to 2000 cs at 25 ° C. B) Directly linked to silicon atoms in one molecule Organohydrogenpolysiloxane having at least 3 hydrogen atoms 0.5 to 30 parts by weight C) Silicone-soluble platinum compound (based on the total amount of A and B) 10 to 500 ppm
D) Inorganic filler 20 to 500 parts by weight E) One or two black inorganic compounds selected from iron trioxide and titanium black 0.5 to 20 parts by weight, measured by a laser displacement meter The error is extremely small, and the hardness after curing is high, and it is easy to cut with a knife, etc., and it does not deform when cutting out places that hinder measurement, and the shape and positional relationship of the occlusal surface are accurate. It is possible to measure.
[0007]
The A component of the silicone impression material for occlusal measurement according to the present invention is an organopolysiloxane having at least two aliphatic unsaturated groups in one molecule and a viscosity at 25 ° C. of 50 cs to 2000 cs. . This organopolysiloxane is preferably linear and has both ends of the molecular chain blocked with vinylsilyl groups, but there may be a plurality of the terminal vinyl groups, or vinyl groups are contained in the chain. May be. Since this organopolysiloxane has a viscosity of 50 cs to 2000 cs, it is effective in increasing the hardness of the cured product and improving the machinability when used together with the E component described later. If the viscosity of this organopolysiloxane at 25 ° C. is less than 50 cs, the cured product becomes brittle, and if it is greater than 2000 cs, the hardness of the cured product decreases and the machinability also decreases.
[0008]
The organohydrogenpolysiloxane which is the B component of the silicone impression material for occlusal measurement according to the present invention needs to have at least three hydrogen atoms directly bonded to silicon atoms in one molecule, and acts as a crosslinking agent. Therefore, the content greatly affects the curing characteristics. If the organohydrogenpolysiloxane is less than 0.5 parts by weight with respect to 100 parts by weight of the component A, the curing rate becomes slow, so that it tends to be deformed when the impression material is taken out from the oral cavity, and if it is more than 30 parts by weight, it is cured. Not suitable because the body becomes too brittle.
[0009]
Examples of the silicone-soluble platinum compound that is the C component of the silicone impression material for occlusal measurement according to the present invention include chloroplatinic acid, alcohol-modified chloroplatinic acid, complexes of chloroplatinic acid and olefin, which are known addition reaction catalysts. It is done. Particularly preferably, a vinyl siloxane complex of chloroplatinic acid is used. This addition amount is in the range of 10 to 500 ppm with respect to the total amount of the A component and the B component. If it is less than 10 ppm, the curing rate is slow, and if a trace amount of a substance that inhibits the catalytic ability of the platinum compound is present, the curing is slow. If it exceeds 500 ppm, the curing speed is too high and the cured product turns yellow over time, and the color tone of the edge changes. The silicone-soluble platinum compound such as chloroplatinic acid is preferably used after being dissolved in an alcohol, ketone, ether or hydrocarbon solvent, polysiloxane oil or the like.
[0010]
Examples of the inorganic filler that is the D component of the silicone impression material for occlusal measurement according to the present invention include quartz, cristobalite, diatomaceous earth, fused quartz, and glass fiber, and one or more of these can be used. The inorganic filler as component D needs to be 20 to 500 parts by weight with respect to 100 parts by weight of component A, and if it is less than 20 parts by weight, the viscosity of the kneaded paste is too low. When the paste is raised, the paste flows down and an impression of the occlusal surface cannot be obtained. When the amount exceeds 500 parts by weight, the viscosity of the paste is too high and bubbles are easily caught on the occlusal surface.
[0011]
The E component of the silicone impression material for occlusal measurement according to the present invention has one or two selected from iron tetroxide and titanium black as an extremely safe material for a living body without adversely affecting the curing reaction. It uses a kind of black inorganic compound, and has the effect of preventing the influence of ambient light when measuring with a laser displacement meter and eliminating measurement errors. When this E component is not blended, the measurement value of the laser displacement meter has a large error depending on the measurement position, the shape measurement of the occlusal surface becomes inaccurate, and as a result, the dental prosthesis produced by CAD / CAM. The conformity accuracy and occlusal state of the object will deteriorate. The content of the black inorganic compound which is the E component is 0.5 to 20 parts by weight with respect to 100 parts by weight of the A component. The cured product becomes brittle.
[0012]
Furthermore, in the silicone impression material for occlusal measurement according to the present invention, a colorant such as titanium dioxide or titanium yellow may be used as long as the characteristics are not lost. By adding a small amount of a pigment with strong concealment such as titanium dioxide or titanium yellow, it is possible to easily visually confirm the state of impression taking on the occlusal surface.
[0013]
【Example】
EXAMPLES Next, although an Example is given and this invention is demonstrated further in detail, this invention is not limited to these.
[0014]
<Example 1>
A silicone impression material for measurement of occlusion was prepared, consisting of a base paste and a catalyst paste with the following composition.
(Base paste)
・ 100 parts by weight of dimethylpolysiloxane blocked at both ends with a dimethylvinylsiloxy group with a viscosity of 500 cs at 25 ° C. ・ Linear methylhydrogenpolysiloxane containing 30 mol% of methylhydrogensiloxane units 10 parts by weight, 150 parts by weight of quartz, 7 parts by weight of iron trioxide (catalyst paste)
・ 100 parts by weight of dimethylpolysiloxane having both ends of a molecular chain with a viscosity of 500 cs at 25 ° C. blocked with dimethylvinylsiloxy groups ・ Silicone oil solution containing 0.3% by weight of 1,3 divinyltetramethyldisiloxane-platinum complex 5 Part by weight, 150 parts by weight of quartz, 7 parts by weight of iron trioxide [0015]
First, in order to test the measurement error of the impression material with a laser displacement meter (wavelength: 670 nm, output: average 950 μW), the impression standard of the impression material described in JIS T 6513 was used. The distance between the lines (25 mm) was measured with the laser displacement meter, and then the base paste and catalyst paste were weighed and kneaded to obtain an impression of the mold, which was reproduced on the impression. Similarly, the distance between the gauge points was measured with a laser displacement meter to obtain the difference. This measurement was repeated 5 times, and the average value and standard deviation of this difference are shown in Table 1. Moreover, in order to confirm whether it has sufficient hardness, the hardness of the hardening body of the said impression material was measured by the method according to JIS T6301. Further, the degree of machinability of the cured product was evaluated by evaluating the ease of cutting (cutting property) by cutting the cured body with a knife in accordance with actual clinical practice. The results are summarized in Table 1. As is apparent from Table 1, the difference between the measured values by the laser displacement meter and the standard deviation are sufficiently small as compared with Comparative Example 1 in which the same measurement was measured with a commercially available impression material for bite acquisition, and according to the present invention. It was confirmed that the silicone impression material for occlusion measurement can be measured with very high accuracy. The hardness and machinability were also good compared to the commercially available impression material for obtaining occlusion in Comparative Example 1.
In addition, when actually creating a bridge-shaped dental prosthesis in a CAD / CAM system using a ceramic block, the occlusal surface shape and the adjacent teeth are measured using this occlusal measurement silicone impression material as a check bite material. The contact point is measured with a laser displacement meter, and this data is used to adjust and correct the occlusal surface shape and occlusal relationship of the upper and lower jaws on the computer screen displayed based on the measurement data of the gypsum model. A bridge was designed and fabricated. When the obtained bridge was set in the oral cavity of the patient, the fitting accuracy was excellent and the occlusal relationship with the counter teeth was also good.
[0016]
<Example 2>
A silicone impression material for measurement of occlusion was prepared, consisting of a base paste and a catalyst paste with the following composition.
(Base paste)
-100 parts by weight of dimethylpolysiloxane with both ends of the molecular chain blocked with dimethylvinylsiloxy groups having a viscosity of 2000cs at 25 ° C-Linear methylhydrogenpolysiloxane containing 20 mol% of methylhydrogensiloxane units 60 parts by weight, fused silica 500 parts by weight, titanium black 0.5 parts by weight (catalyst paste)
・ 100 parts by weight of dimethylpolysiloxane blocked at both ends of the molecular chain with a dimethylvinylsiloxy group with a viscosity of 2000 cs at 25 ° C. ・ A silicone oil solution containing 0.3% by weight of 1,3 divinyltetramethyldisiloxane-platinum complex 4 Part by weight, 500 parts by weight of quartz, 0.5 parts by weight of titanium black The same test as in Example 1 was performed, and the results are shown in Table 1. The measurement error by the laser displacement meter was as small as in Example 1, and the hardness and machinability were good. In addition, as in Example 1, the treatment actually used for the production of the bridge was excellent in the fitting accuracy and the occlusal relationship with the counter teeth.
[0017]
<Example 3>
A silicone impression material for measurement of occlusion was prepared, consisting of a base paste and a catalyst paste with the following composition.
(Base paste)
・ 100 parts by weight of dimethylpolysiloxane blocked at both ends with a dimethylvinylsiloxy group with a viscosity of 50 cs at 25 ° C. ・ Linear methylhydrogenpolysiloxane containing 20 mol% of methylhydrogensiloxane units 1 part by weight, fused silica 20 parts by weight, titanium black 1 part by weight, iron trioxide 19 parts by weight (catalyst paste)
・ 100 parts by weight of dimethylpolysiloxane having both ends of a molecular chain blocked with dimethylvinylsiloxy groups at 25 ° C. and a viscosity of 50 cs ・ Silicone oil solution containing 0.3% by weight of 1,3 divinyltetramethyldisiloxane-platinum complex 4 Part by weight, 20 parts by weight of quartz, 1 part by weight of titanium black, 19 parts by weight of iron tetroxide The same test as in Example 1 was performed and the results are shown in Table 1. The measurement error by the laser displacement meter was as small as in Example 1, and the hardness and machinability were good. In addition, as in Example 1, the treatment actually used for the production of the bridge was excellent in the fitting accuracy and the occlusal relationship with the counter teeth.
[0018]
<Comparative Example 1>
The same test as in Example 1 was performed using a commercially available silicone impression material for bite collection (manufactured by GC Corporation: product name “GC Exabite”). The results are shown in Table 1. Moreover, although it tried to use for preparation of bridge | bridging similarly to Example 1, a measurement error was large and adjustment and correction | amendment of occlusion relation were not able to be performed.
[0019]
<Comparative example 2>
A base paste and a catalyst paste having the following composition were prepared by removing triiron tetroxide from the composition of Example 1.
(Base paste)
・ 100 parts by weight of dimethylpolysiloxane blocked at both ends with a dimethylvinylsiloxy group with a viscosity of 500 cs at 25 ° C. ・ Linear methylhydrogenpolysiloxane containing 30 mol% of methylhydrogensiloxane units 10 parts by weight, 150 parts by weight of quartz (catalyst paste)
・ 100 parts by weight of dimethylpolysiloxane having both ends of a molecular chain with a viscosity of 500 cs at 25 ° C. blocked with dimethylvinylsiloxy groups ・ Silicone oil solution containing 0.3% by weight of 1,3 divinyltetramethyldisiloxane-platinum complex 5 Part by weight / Quartz 150 parts by weight The same test as in Example 1 was performed, and the results are shown in Table 1. The measurement error by the laser displacement meter is large as in the comparative example. Moreover, hardness and machinability were also inferior to Example 1. Moreover, although it tried to use for preparation of bridge | bridging similarly to Example 1, a measurement error was large and adjustment and correction | amendment of occlusion relation were not able to be performed.
[0020]
[Table 1]

[0021]
As is apparent from Table 1, the silicone impression material for occlusal measurement according to the present invention has an extremely small measurement error with a laser displacement meter, compared with a commercially available impression material for obtaining occlusion, and the occlusal surface shape and counter teeth. It was confirmed that the positional relationship between and can be measured accurately and accurately. Moreover, the hardness was higher than that of the comparative example, and the machinability was also good.
[0022]
【The invention's effect】
As described above in detail, the silicone impression material for occlusal relationship measurement according to the present invention has a very small measurement error by the laser displacement meter, and can accurately and accurately measure the occlusal surface shape and the positional relationship with the opposing teeth. In addition, it has high hardness and good machinability.
Therefore, by reproducing the occlusal relationship in the oral cavity of the patient on the computer screen based on the data measured using the silicone impression material for measuring the occlusal relationship according to the present invention, the accurate and accurate occlusal relationship is reproduced. As a result, it becomes possible to obtain a dental prosthesis excellent in conformity accuracy and occlusal state, and the value of contributing to the dental field is very great.

Claims (1)

A) 100 parts by weight of an organopolysiloxane having at least two aliphatic unsaturated hydrocarbons in one molecule and having a viscosity of 50 to 2000 cs at 25 ° C. B) Directly linked to silicon atoms in one molecule Organohydrogenpolysiloxane having at least 3 hydrogen atoms 0.5 to 30 parts by weight C) Silicone-soluble platinum compound (based on the total amount of A and B) 10 to 500 ppm
D) 20 to 500 parts by weight of an inorganic filler E) Silicone for measuring occlusions, characterized by comprising 0.5 to 20 parts by weight of one or two black inorganic compounds selected from iron trioxide and titanium black Composition.