CN1004328B - Improvement of filler of organosilicon slurry for dentistry - Google Patents
Improvement of filler of organosilicon slurry for dentistry Download PDFInfo
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- CN1004328B CN1004328B CN85101704.5A CN85101704A CN1004328B CN 1004328 B CN1004328 B CN 1004328B CN 85101704 A CN85101704 A CN 85101704A CN 1004328 B CN1004328 B CN 1004328B
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- paraffin oil
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Abstract
一种用于牙科制作牙模的，于使用前进行混合并于室温下硬化的组合物，包括ａ）可交联的有机聚硅氧烷，ｂ）疏水填料微粒，ｃ）石蜡油，ｄ）染料，ｅ）交联催化剂。其改进包括使用ｂ）疏水填料微粒，在其表面载有按总填料为基准为０．５～５％重量计的石蜡油，所用的填料或者存在于可交联的有机硅组分中或者存在于催化剂组分中，也可以存在于这两种组分之中。每种组分可包含其它的成分，不会硬化，但当上述两种组分聚在一起时则会硬化，从而形成精确的牙模。A composition for dental impressions, mixed before use and hardened at room temperature, comprising a) a crosslinkable organopolysiloxane, b) hydrophobic filler particles, c) paraffin oil, d) dyes, e) crosslinking catalysts. The improvement includes the use of b) hydrophobic filler particles, the surface of which is loaded with paraffin oil in an amount of 0.5 to 5% by weight based on the total filler, the filler being used either in the cross-linkable silicone component or in the presence of In the catalyst component, it can also be present in these two components. Each component may contain other components that do not harden, but do harden when the two components are brought together to form a precise dental model.
Description
The present invention relates to silicone pastes loaded with paraffinic oil fillers, in particular to silicone pastes for producing kneadable components for accurate dental molds. The silicone paste known earlier is preferably a two-component silicone rubber system hardened at room temperature, and the two pastes in the system are mixed together and then crosslinked at room temperature for 2-5 minutes.
Silicone pastes are widely used for making dental moulds, and generally comprise silicone oils (silicone oils are mixed with fillers and are based on polydimethylsiloxanes having hydroxyl groups at their ends, and depending on the method used, different consistencies) and hardening components in liquid or paste form (metal salts containing monocarboxylic acids as catalysts), and silicate esters as crosslinking agents.
Before use, the two components are mixed and crosslinked for 2-5 minutes at room temperature, and as a result, a condensation reaction occurs. In addition to the crosslinked silicone rubber, a small amount of ethanol is also produced, which slowly seeps out of the rubber, causing linear shrinkage and resulting in nonstandard dental molds.
It was known for several years that the linear shrinkage of vinyl silicone dental modules was substantially much smaller. These compositions consist of two slurries, one being a main slurry containing a silicone oil filler and a cross-linking agent and one being a catalyst slurry containing a silicone oil, filler and a catalyst.
The silicone oil used is polydimethylsiloxane having vinyl groups at the molecular terminals, and a crosslinking agent having SiH active groups and a catalyst composed of a platinum complex are used, in these systems, not only are the models made to have relatively high dimensional accuracy, but also the main slurry and the catalyst slurry are easily metered because they have the same viscosity and mixing ratio: the two slurry ratios are adjusted to 1:1, and the slurries are completely odorless and odorless.
Since in dentistry, dental moulds, in particular with teeth, toothless and mucous membranes, can be manufactured in various ways, a range of dental mould compositions of different viscosities, such as low viscosity, medium viscosity, high viscosity and kneadable, are all required. These compositions consist of a main slurry and a catalyst slurry, which is used in particular to adjust the desired crosslinking time.
In processing low viscosity, medium viscosity and high viscosity compositions, the primary slurry and catalyst slurry are extruded from tubes or drums of equal length, fed into a mixing device, mixed with a spatula, the primary slurry and catalyst slurry of the kneadable dental model component are removed from a plastic jar or beaker with a suitable graduated spoon, the same size of block is kneaded with a finger into a homogeneous mass, this homogeneous mass is fed into a dental model holder, and then placed into the mouth of the patient. After a few minutes, the tray, together with the dough that has been cross-linked to form rubber, can be removed from the patient's mouth and the dental cast opposite the gum site can be further modified with a low viscosity dental cast component and then filled with plaster of paris slurry. When the plaster model hardens, it takes the shape of a gum.
When the main paste and the catalyst paste are taken out and the paste is kneaded with a finger, it is important that the components not adhere to the measuring spoon or finger and/or remain at the end, the adhesion is avoided by the selection of suitable fillers and the addition of paraffin oil, whereas in the case of a silicone-containing dental module compound crosslinked by condensation reaction, the adhesion is partially inhibited by talc, since it is not possible for talc to undergo an addition reaction in the crosslinking of the vinyl dental module compound, i.e. talc has the opposite effect to the hardening of the composition. The addition of paraffin oil is not completely unproblematic either, but on the one hand, the amount of paraffin oil in the composition must be 6 to 8% by weight in order to prevent sticking. On the other hand, some paraffin oil may ooze out of the paste and the dental model during storage, that is, paraffin oil may accumulate in recesses on the surface of the paste or may be formed as paraffin oil droplets on the surface of the dental model. The latter function, on the one hand, prevents the bonding between the kneaded components after the components have hardened, and if correction is performed with a low-viscosity correction material, it takes a prolonged time to do so, on the other hand, it causes defects in the gypsum model. Furthermore, the addition of paraffin oil reduces the necessary adhesion of the composition to the walls of the dental cast.
According to the invention, the above problems are avoided by using a filler loaded with paraffin oil in the slurry. In order to eliminate the tackiness of the slurry, it is preferable to add only 4-5% by weight of paraffin oil to the slurry, and since 1-2% by weight of paraffin oil is already present on the surface of the filler, it is preferable that the slurry contains only 2-4% by weight of pure paraffin oil which itself has affinity for the filler carrying paraffin oil and has a low tendency to exude. The soft, plastic composition or dental cast obtained in this way has a relatively long pot life, i.e. it is difficult to form any paraffin oil droplets in the paste or on the rubber of the dental cast, thus allowing satisfactory dental cast correction and/or preparation of a satisfactory plaster cast even when the dental cast is stored for a long period of time.
Further, the problem of adhesion of the composition to the walls of the dental cast has been improved.
Thus, the present invention relates to an inorganic filler for a siliceous slurry composition, characterized in that the filler surface is loaded with 0.5-5%, preferably 1-2.5% paraffin oil relative to the total filler weight.
If properly mixed with conventional unmodified fillers, the silicone slurry according to the invention should contain 30-90% by weight (relative to the total weight of the slurry), preferably 50-80% by weight of modified filler.
According to the invention, the improved filler is preferably used in room temperature hardening, silicone-based dental compositions. As stated at the outset, the difference between the two systems lies in the crosslinking by means of an addition reaction and the crosslinking by means of a condensation reaction.
The basic components of the slurry crosslinked by the addition reaction in the system are:
a) Organopolysiloxane containing two or more vinyl groups in the molecule
B) If properly mixed with conventional inorganic fillers, hydrophobic inorganic fillers are used according to the present invention.
C) Organohydrido polysiloxanes as cross-linking agents
D) Catalyst for accelerating addition reaction
E) Paraffin oil
F) Dye
The slurry, which uses a hardening component in liquid or slurry form composed of metal salts of monocarboxylic acids as a catalyst and silicate as a crosslinking agent to crosslink the system by condensation, mainly contains the components:
g) Organopolysiloxane containing two or more hydroxyl groups in the molecule.
H) The fillers according to the invention can, if appropriate, be mixed with customary inorganic fillers.
I) Paraffin oil
J) Dye
The filler-containing kneadable silicone pastes according to the invention are distinguished by a long pot life and by the fact that the pastes and catalyst pastes (or pastes and curing components) do not adhere when mixed. These slurries are suitable for preparing accurate dental casts because they provide a plaster cast that renders the replica faithful to the component. After thoroughly mixing the crosslinked master and catalyst slurries, the mold is filled with gypsum slurry which hardens to form a mold by placing the mold in the mouth and applying pressure. The reason for achieving such good results is that the surface of the dental model is free of paraffin oil droplets forming and does not prevent the bonding between the initial dental model composed of the kneadable composition and the modified dental model composed of the low viscosity composition and/or ruin plaster model surface.
The starting materials for the above-mentioned room temperature hardening slurries are known. Silicone oil a) is a polydimethylsiloxane having a vinyl group at the molecular terminal and preferably having a viscosity of 500 to 5000000 mPa.s at 20 ℃.
Suitable fillers b) are calcium sulfate, diatomaceous earth, talc, calcium carbonate and quartz powder and cristobalite powder modified according to the invention. The filler particles preferably have a size of 1-25 μm and too fine particles can result in a slurry having an undesirable inherent viscosity.
The crosslinking agent c) is a polydimethylsiloxane having hydrogen atoms on at least two silicon atoms in the molecule.
Catalyst d) is exemplified by a platinum complex prepared from hexachloro-n-platinum (IV) acid. These compounds are also known.
The paraffin oil e) is composed of an alkane mixture which is liquid at room temperature and has a good viscosity of 120-300 mPas, especially a viscosity of 170-230 mPas at 20 ℃.
The dye f) is used to distinguish the primary slurry from the catalyst slurry and to control the mixing process. Inorganic and organic dyes are preferred.
Silicone oil g) is a polydimethylsiloxane having a hydroxyl group at the molecular end and a viscosity in the range of preferably 500 to 200000 mPas at 20 ℃.
Filler h), paraffin oil i) and dye j) are identical to those of b), e) and f). Pure paraffinic oil with a low tendency to exudation. The soft, plastic composition or dental cast obtained in this way has a relatively long pot life, i.e. it is difficult to form any paraffin oil droplets in the paste or on the rubber of the dental cast, thus allowing satisfactory dental cast correction and/or preparation of a satisfactory plaster cast even when the dental cast is stored for a long period of time.
Further, the problem of adhesion of the composition to the walls of the dental cast has been improved.
Thus, the present invention relates to an inorganic filler for a siliceous slurry composition, characterized in that the filler surface is loaded with 0.5-5%, preferably 1-2.5% paraffin oil relative to the total filler weight.
If properly mixed with conventional unmodified fillers, the silicone slurry according to the invention should contain 30-90% by weight (relative to the total weight of the slurry), preferably 50-80% by weight of modified filler.
According to the invention, the improved filler is preferably used in room temperature hardening, silicone-based dental compositions. As stated at the outset, the difference between the two systems lies in the crosslinking by means of an addition reaction and the crosslinking by means of a condensation reaction.
The basic components of the slurry crosslinked by the addition reaction in the system are:
a) Organopolysiloxane containing two or more vinyl groups in the molecule
B) If properly mixed with conventional inorganic fillers, hydrophobic inorganic fillers are used according to the present invention.
C) Organohydrido polysiloxanes as cross-linking agents
D) Catalyst for accelerating addition reaction
E) Paraffin oil
F) Dye
The slurry, which uses a hardening component in liquid or slurry form composed of metal salts of monocarboxylic acids as a catalyst and silicate as a crosslinking agent to crosslink the system by condensation, mainly contains the components:
g) Organopolysiloxane containing two or more hydroxyl groups in the molecule.
H) The fillers according to the invention can, if appropriate, be mixed with customary inorganic fillers. And transferred to a cast (obtained by filling the cast with a gypsum slurry consisting of 100 parts of calcium sulfate hemihydrate and 30 parts of water and stored for 30 minutes) to form a depression, thus making the cast incorrect.
To produce a precision dental model, a low viscosity vinyl silicone dental model composition is fed into a dental model (which is made as described above, stored for 24 hours and contains oil droplets), and then the dental model is placed into the mouth with appropriate pressure applied. After 5 minutes the composition hardened or the elastomer, after removal of the dental model from the mouth, the elastomer was found to not show any sticking to the initially formed dental model material in the oil wet area.
Example 2 (according to the invention)
2000 Parts of quartz powder and 30 parts of paraffin oil having a viscosity of 180 mPas at 20℃were mixed in a ball mill for 60 minutes, and after air classification of the mixture, a component having a particle size of less than 25 μm was used as a slurry.
The main slurry was prepared by mixing 170 parts of polydimethylsiloxane having a vinyl group at the molecular end and a viscosity of 80000 mPas at 20℃with 50 parts of polydimethylsiloxane having a dimethylsilylene group at the molecular end and a viscosity of 50 mPas at 20℃with 742 parts of fine quartz powder carrying paraffin oil, 33 parts of paraffin oil having a viscosity of 180 mPas at 20℃and 5 parts of an organic coloring dye in a kneader.
The catalyst slurry was prepared by mixing 230 parts of polydimethylsiloxane having a molecular terminal containing vinyl groups and a viscosity of 80000 mPas at 20℃with 732 parts of fine quartz powder loaded with paraffin oil, 37.8 parts of paraffin oil having a viscosity of 180 mPas at 20℃and 0.2 parts of platinum/silicone complex in a kneader.
Both pastes were plastic and non-tacky and could be kneaded rapidly, and after two months of storage, no paraffin oil oozed out.
The two slurries were mixed in a 1:1 ratio and after 24 hours of production of the dental cast, the surface was free of oil droplets. The modified material is well adhered, and the plaster mold has no damage.
Example 3 (comparative experiment)
The slurry was prepared by mixing 210 parts of polydimethylsiloxane having a hydroxyl group at the molecular terminal and a viscosity of 50000 mPas at 20℃and 80 parts of paraffin oil having a viscosity of 180 mPas at 20℃in a kneader, 600 parts of fine quartz powder in example 1 and 10 parts of titanium dioxide.
These pastes are plastic and non-tacky and can be rapidly kneaded. However, after 7 days of storage, paraffin oil accumulated on the surface of the slurry to generate dishing.
25 G of the slurry and 1 g of a hardening composition consisting of dibutyltin dilaurate and tetraethoxysilane (1:1) were kneaded for 30 seconds to give a homogeneous mass, which was placed on a dental cast, placed in a mouthpiece and subjected to an appropriate pressure. The homogeneous mass hardened into an elastomer after 5 minutes. It is taken out from the mouth, washed with flowing water and tapped with medical soft absorbent paper, and the dental model is stored at room temperature for 24 hours. Thereafter, paraffin oil droplets are formed on the surface of the dental cast and transferred to a plaster cast (prepared by filling with a plaster slurry consisting of 100 parts of calcium sulfate hemihydrate and 30 parts of water and storing for 30 minutes) to form depressions, thus making the plaster cast incorrect.
To produce a precise dental model, a low viscosity silicone dental model composition is placed into a dental model (which is made as described above, stored for 24 hours and contains oil droplets), and then the dental model is placed into the mouth, applying the appropriate pressure. After 5 minutes the composition hardened to an elastomer which was removed from the mouth and was found to not show any sticking to the initially formed dental cast material in the oil wet area.
Example 4 (according to the invention)
The slurry was prepared by mixing 220 parts of polydimethylsiloxane having a hydroxyl group at the molecular terminal and a viscosity of 50000 mPas at 20℃with 40 parts of paraffin oil having a viscosity of 180 mPas, 100 parts of calcium carbonate, 630 parts of fine quartz powder having a paraffin oil coated on the surface as described in example 2, and 10 parts of titanium dioxide in a kneader.
The slurry is plastic and non-tacky and can be kneaded rapidly, and after 2 months of storage, the paraffin oil remains unseparated.
After the paste and the hardening composition consisting of dibutyltin dilaurate and tetraethoxysilane were mixed, a dental model was produced, and after 24 hours, the dental model surface was free of oil droplets. The modified material has good adhesion and the plaster mold has no damage.
It should be understood that the description and examples illustrate the invention, but the invention is not limited to the details, and that those skilled in the art can readily devise various implementations that do not depart from the spirit and scope of the invention.
Claims (6)
1. A composition for dental casting, which is mixed before use and hardened at room temperature, the composition comprising
A) A cross-linkable organopolysiloxane of the type described above,
B) The particles of the hydrophobic filler are present in the composition,
C) The paraffin oil is used for preparing the liquid,
D) The dye is used to bind the dye to the substrate,
E) The crosslinking catalyst is characterized in that component b) is used, the surface of which is loaded with 0.5-5% by weight of paraffin oil based on the total filler, the particle size of which is 1-25 mu m, the viscosity of the paraffin oil used is 120-400mPa.s at 20 ℃, and the content of component C), i.e. the paraffin oil, in the composition is 2-4% by weight.
2. Composition according to claim 1, wherein a) is an organopolysiloxane containing at least two vinyl groups in the molecule and e) is an organohydrido polysiloxane.
3. Composition according to claim 1, wherein a) is an organopolysiloxane containing at least two hydroxyl groups in the molecule and e) is a silicate.
4. The composition according to claim 1, wherein said component b), the hydrophobic filler, comprises calcium sulfate, diatomaceous earth, talc, calcium carbonate, quartz powder, or cristobalite powder.
5. Composition according to claim 1, characterized in that the filler particles are loaded with 1-2.5% paraffin oil.
6. The composition according to claim 1, characterized in that the paraffin oil has a viscosity of 170 to 230mpa.s at 20 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101704.5A CN1004328B (en) | 1985-04-01 | 1985-04-01 | Improvement of filler of organosilicon slurry for dentistry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101704.5A CN1004328B (en) | 1985-04-01 | 1985-04-01 | Improvement of filler of organosilicon slurry for dentistry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101704A CN85101704A (en) | 1987-01-24 |
| CN1004328B true CN1004328B (en) | 1989-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85101704.5A Expired CN1004328B (en) | 1985-04-01 | 1985-04-01 | Improvement of filler of organosilicon slurry for dentistry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004328B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201314284D0 (en) * | 2013-08-09 | 2013-09-25 | Dow Corning | Cosmetic compositions containing silicones |
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1985
- 1985-04-01 CN CN85101704.5A patent/CN1004328B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN85101704A (en) | 1987-01-24 |
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