FR2564730A1 - COMBINED PACKAGING FOR THE PREPARATION OF DENTAL MASSES - Google Patents

Abstract

COMBINED PACKAGING FOR PREPARATION OF A DENTAL MASS BASED ON POLYSILOXANNES, BELONGING TO A DETERMINED VISCOSITY CLASS AND HARDENING AT ROOM TEMPERATURE. THE PACKAGING CONTAINS A CATALYST PATE AND A BASE PATE WHICH MUST BELONG TO THE CORRESPONDING VISCOSITY CLASSES. TO AVOID CONFUSION IN THE VISCOSITY CLASSES, ONE OF THE TWO PASTA IS INTRODUCED IN A CLASSIC TUBE AND COLORED IN A SHADE ATTRIBUTED TO THE PARTICULAR VISCOSITY CLASS, AND THE OTHER PASTE, UNCOLORED OR COLORED IN A CONTRASTING SHADE , PLACED IN A TUBE 1 HAVING INSIDE, IN THE EXTENSION OF THE OUTLET 3, A TUBULAR PART 4 WITH SLOT-SHAPED ORIFICES 5 IN THE LARGEST PART K OF THIS TUBE, WHILE A SMALL QUANTITY OF THE FIRST DOUGH IS INTRODUCED IN PART J OF THE SAME TUBE, GIVING THE DELIVERY OF MARBLES WHOSE COLOR CORRESPONDS TO THAT OF THE FIRST DOUGH.

Description

The present invention relates to a combination packaging for

  the preparation of a dental mass based on polysiloxanes, hardened

  sand at room temperature and having a viscosity of a certain class. Modern vinylsilicone pulp systems of this type crosslink according to the addition principle and usually contain organopolysiloxanes having two or more groups.

  vinyl in the molecule, an organohydrogenpolysiloxane, a

  a lysate for accelerating the addition reaction, hydrophobic fillers and, if desired, other customary additives and dyes. These constituents are prepared in the form of a catalyst paste containing the catalyst, silicone oil, fillers and, where appropriate, dyes, and a base paste containing the crosslinking agent, which is silicone oil, fillers and, where appropriate, colorants. Both pasta

  are packed in tubes, cartridges or systems of deli-

  similar products and are offered in combination packaging. We

  prepares the final dental mass by mixing the base paste containing

  the crosslinking agent with a corresponding amount of the catalyst paste. At room temperature, the crosslinking reaction is complete in 2-5 min. The silicone oil is a vinyl endblocked polydimethylsiloxane. The crosslinking agent contains the reactive SiH groups and the catalyst consists of a platinum complex. The two pastes are preferably mutually adapted to an identical viscosity so that they can be worked in mixing ratios of 1: 1. The principle described above can be applied analogously to known silicone systems in which it is

  produces a reactiondecondensation. However, in these systems, -

  the mixing proportions are different.

  Since in dentistry various techniques are used to make moldings of toothed, partially toothed and edentulous jaws and gingiva, the molding masses have to be offered in various viscosity classes. Thus, for the double molding technique, masticable masses are required as a premoulding material and low-viscosity materials as a corrective material, whereas for the double-mixing technique highly viscous masses are required. as a spatula material and medium-viscosity masses as an injection material. For the one-phase technique,

  masses that have a medium to high viscosity.

  On the one hand, the catalyst paste and the base paste are stained to different shades to differentiate the individual viscosity classes. On the other hand, a coloring different from that of the corresponding catalyst paste is also chosen for the base paste in order to allow visual control of the mixture. The base paste and the catalyst paste must be mixed vigorously until a homogeneous mixture is obtained

with uniform coloring.

  While the kneadable masses are generally packaged in plastics doses, low viscosity, medium viscosity and high viscosity masses are packaged in tubes or cartridges. Taking into account the various molding techniques, mold masses are kept in reserve

  corresponding viscosity in the practice of dentistry.

  Although the corresponding tubes of a screw class

  the color of the product so as to immediately recognize the catalyst paste corresponding to a particular base paste, one can not completely exclude confusion in the choice of the tubes and, consequently, a mixture of a paste of

  base and a catalyst paste belonging to classes of

  different cosity. Such an error results in a change in

  the physical properties and, consequently, a decrease in the quality of the molding results. The invention starts from this situation. The aim of the invention is to exclude, by an appropriate color coding of the two pastas, an error in the choice of pastes,

  leading to the use of pastes of different viscosity grades.

  ferent. This object has been achieved according to the invention by coloring one of the two pastes in a grade assigned to the particular viscosity class and filling a small portion of the package volume of the other paste with an inert paste or other colored paste in the same shade, while the dough found in the remaining part of the packing volume is not

  colored or is colored in white or in a contrasting shade.

  Preferably, the base paste is colored to a particular viscosity grade and a small portion of the packaging volume of the catalyst paste is filled with correspondingly colored pasty inert substance or catalyst paste. correspondingly colored, while the rest of the catalyst paste is not colored or is colored in white or in a contrasting shade. Particularly satisfactory results have been obtained for this purpose in one mode.

  embodiment of the combined packaging in which the pulp of

  The lyser is packaged in a tube, cartridge or similar package having therein, in the extension of the outlet, a short tubular piece with respect to the length of the tube having slit-like orifices in the surface. of the casing, and the colored part of the catalyst paste or the colored inert substance is layered around the tubular part, while the remaining part of the tube, outside the tubular part, is lined with the catalyst paste white or not colored. These tubes or cartridges are filled by introducing the colored catalyst paste in the shade of the base paste or the

  inert substance with the same color up to the top of the

  mite the tube and then applying over a layer of unstained catalyst paste. The end of the tube is then closed in the usual manner. When pressed on the tube with the removed screw cap, a paste bead consisting mainly of white paste is produced which flows through the tubular piece and the outlet port. At the same time, in this operation, a small amount of the colored paste penetrates through the slits in the tubular piece, so that there are several colored mottles on the surface of the white paste. If we then mix such a bead of catalyst paste with a bead of the same length of the colored base paste in correspondence and from a tube or a normal cartridge, there is first a strong color contrast between the two pastas, a contrast that gradually disappears as one mixes. So, therefore, by the uniformity of

  the shade, we can ensure that we have obtained a homogeneous finished mixture.

  The starting materials of the preparation of the vinylsilicone masses are silicone oil, fillers, crosslinking agent, catalyst and colored pigments. The silicone oil is preferably a trimethylsilyl or vinyl terminated polydimethylsiloxane, the viscosity of which may be in the range of 200 to 100,000 mPa.s depending on the viscosity class required. The fillers used are quartz and cristobalite flours, calcium sulphate, earth

  diatomaceous earth or silica precipitated or prepared by pyrolysis.

  The crosslinking agent is a polydimethylsiloxane containing in its molecule hydrogen atoms on at least two

  silicon atoms. Polymer siloxane copolymers

  differentiated and trialkylsilyl or di-

alkylhydrogensilyl are known.

  The catalyst is a platinum complex prepared in

  from hexachloroplatinic acid-IV. These compounds are also

known in itself.

  The inert substance mentioned above, which is used to produce colored mottling, which is (preferably) in the partial volume of the tube with the catalyst paste, is constituted

  of the above mentioned silicone oil and fillers.

  The preferred dyes are colored mineral or organic pigments.

  picnics. The color coding according to the invention makes it possible to

  characterize by color the molding masses with different viscosities

  For the various dental molding techniques, the coincidence between the color-coded paste of the base paste in the mass and the nuance of the colored mottles appearing on the roll of the catalyst paste in the same class viscosity to practically exclude an error in the choice of tubes or cartridges and, consequently, the mixing of a base paste and a catalyst paste belonging to different viscosity classes. This avoids, for example, confusion between the blue colored base paste and the blue and white streaked catalyst paste of the "high viscosity" class with the green colored base paste and the mottled catalyst paste.

  white and green of the class "medium viscosity".

  In addition, there is a means of controlling the

  mixture, since when mixing the base paste and the cat-

  lyser, a homogeneous mixture can only be obtained when the mass

  has taken a uniform color without mottles or streaks.

  Other features and advantages of the invention

  appear more clearly on reading the description below.

  after given with reference to the single figure of the attached drawing which

  represents the tube used (preferably) for the cat-

  lyst. With reference to this figure, the tube 1 carries, at its

  upper end, a threaded connection 2 with outlet 3.

  In the extension of the threaded connection 2, there is arranged inside the tube 1 and in the central position a short tubular part 4 open at its lower part and which has slot-like orifices 5 distributed on its envelope surface. The length of the tubular piece 4 represents approximately 1/15 to 1/20 of the total length of the tube 1. The large volume which is below the tubular part 4 is lined with the colorless or colored K catalyst paste. White. The remaining space around the tube 4 contains a catalyst paste J colored in the same shade as the base paste or an inert pasty substance also colored in the shade of the base paste. The colored mass in the small space is thus layered above the unstained or white mass K in the large space. Naturally, the

  catalyst paste K which is in the large space can also

  to be colored in a completely different shade, that is,

  say different from that of the base paste (giving a contrast).

  When pressed on the tube, we obtain a white or colorless pudding bearing colored mottles on the surface. These mottles are due to the fact that small amounts of the paste which is around the tube 4 penetrate into the slots in the form of slits 5 and are deposited on the white paste which flows at

  4. Thus, the mottles indicate a corre-

  unequivocal relationship between the catalyst paste and the base paste of the same color. When mixing the two pasta, a strong color contrast is first caused to disappear when the mixing is continued, so that it is easy to see

  the naked eye if a homogeneous mixture has been obtained.

  The examples which follow illustrate the invention without, however, limiting its scope; in these examples, the indications

  parts and% are by weight unless otherwise stated.

EXAMPLE 1

  The base paste is prepared by mixing in a kneader 330 parts of polydimethylsiloxane end groups

  vinyl, viscosity 10,000 mPa.s at 25 ° C, 80 parts of polydimethyl

  dimethylhydrogensilyl endblocked siloxane, viscosity mPa.s at 25 ° C., 545 parts of fine quartz flour, 40 parts of pyrolysis silica, BET specific surface area 50 m / sec parts of a green mineral colored pigment. The catalyst paste is prepared by mixing in a kneader 400 parts of vinyl-terminated polydimethylsiloxane, viscosity 10,000 mPa.s at 25 ° C., 558 parts of very fine quartz flour, 125 parts of calcium sulphate, 40 parts of silica. specific surface pyrolysis according to BET 50 m2 / g, 0.2 part of a platinum-siloxane complex and 1.8 part of titanium dioxide. Of the 1000 parts of catalyst paste,

  parts which are mixed with 0.6 parts of green mineral pigment.

  While the green base dough of viscosity class "medium viscosity" is packaged in a normal tube, the "medium viscosity" class catalyst paste is packaged in the special tube described above. For this filling, we first have the green part of the catalyst paste around the tubular part 4 carrying slots 5 and then we introduce the

  white paste in the remaining part of the tube.

  When two tubes of dough of the same length are pressed from the two tubes on a block of mixture, a green base paste bead and a green-enameled white catalyst paste bead are obtained. At the beginning of the mixture, a green-white streak mass is obtained which changes to a light green homogeneous color when the mixture is continued and which, after 3 min (counted from the beginning of the mixing), begins to cross-link under the form of a rubber having, 7 min later, a Shore A hardness of

52.

EXAMPLE 2

  The base paste is prepared in a kneader by

  495 parts of a polydimethylsiloxane with tertiary groups

  vinyl, viscosity 10,000 mPa.s at 25 ° C., 300 parts of a dimethylhydrogenosilyl-terminated polydimethylsiloxane, viscosity 50 mPa.s at 25 ° C., 200 parts of pyrolysis silica having

  Subsequent surface treatment, specific surface area

  according to BET 50 m2 / g, and 5 parts of a blue mineral pigment.

  The catalyst paste is prepared in a kneader by mixing 799 parts of a vinyl-terminated polydimethylsiloxane, viscosity 10,000 mPa.s at 25 ° C., 200 parts of pyrolysis silica having undergone a partial surface subsequent treatment, specific surface area according to BET 50 m2 / g, 0.3 part of a complex

  platinum-siloxane and 0.7 part of titanium dioxide.

  From the 1000 parts of catalyst paste, 100 parts are taken and mixed with 0.5 part of blue mineral pigment. While the blue base paste of the "low viscosity" viscosity class is introduced into normal tubes, the catalyst paste is introduced as described above into the special tube. If two tubes of dough of the same length are pressed from the two tubes on a mixing block, a blue base paste and a blue-marbled blue white catalyst paste are obtained. At the beginning of the mixture, a blue-white streak mass is obtained which, as the mixing is continued, is transformed into a homogeneous blue mass which begins to cross-link in a rubber after 3 min 30 s ( after the start of mixing); after

  another 6:30 s, the rubber has a Shore A hardness of 400C.

EXAMPLE 3

  A flock of green base dough of viscosity grade "medium viscosity" (of Example 1) and a blue-blotch length of the same length of catalyst paste, of class S, were placed on a mixing block. viscosity "low viscosity". At the beginning of the mixture, a green-white-blue streak mass is obtained which, as the mixture is continued, is transformed into a green homogeneous mass which begins to cross-link in a rubber 2 min 30 s after start of mixing and has a Shore A hardness of 35 C after another 7:30 s. Unlike the rubbers of Examples 1 and 2, this rubber does not meet the specifications for the silicone molding compositions contained in

  for example, in ADA Specification No. 19.

EXAMPLE 4

  A blob of blue base paste of the "low viscosity" viscosity class (of Example 2) and a blue-blotch length of the same length of catalyst paste of the same class are deposited on a mixing block. viscosity "average viscosity". To the mixture, at first a blue-white-green streaked mass which, as one continues mixing, transforms into a homogeneous blue mass starting to cross-link in a rubber after 4 min and presenting a Shore A hardness of 38 6 min later. Unlike the rubbers of Examples 1 and 2, this rubber does not meet the specifications for silicone molding compositions as described, for example, in ADA specifications No. 19.

Claims (4)

R E V E N D I C A T I 0 N S   1. Combined packaging for the preparation of a dental mass   based on polysiloxanes belonging to a viscosity class determined and curable at room temperature, which cross-links according to the principle of addition and contains the following components: a) organopolysiloxanes bearing two or more vinyl groups in the molecule, b) an organohydrogenpolysiloxane (c) a catalyst for accelerating the addition reaction, (d) hydrophobic fillers and, where appropriate, other customary additives, (e) colorants, these components being in the form of a catalyst paste containing the catalyst, the silicone oil, fillers and, where appropriate, dyes, and a base paste containing the cross-linking agent, the silicone oil, the fillers and, the where appropriate, dyes, both doughs being packaged in tubes, cartridges or similar delivery systems, characterized in that one of the two doughs is colored in a shade assigned to the particular viscosity class and a small portion (I) of the filling volume of the other dough is filled with an inert pasty substance or the other dough colored in the same shade, while the dough which is in the remaining part (K) of the filling volume is not colored or is colored in white or in a contrasting hue.   2. Combination package according to claim 1, characterized in that the base paste is colored in a grade assigned to the particular viscosity class and a small portion (J) of the filling volume of the catalyst paste is filled with the substance colored inert paste or the corresponding colored catalyst paste, while the catalyst paste in the remaining portion of the filling volume is not   colored or is colored in white or in a contrasting hue.   3. Combination package according to claim 2, characterized   in that the catalyst paste is packed in a tube (i),   a cartridge or similar packaging having inside,   The extension of the outlet opening (3) a tubular piece (4) short with respect to the length of the tube, having slot-like orifices (5) in its envelope surface, and the colored part (I) catalyst paste or the colored inert substance is layered around the tubular piece (4), while the remaining part of the tube (1), without tubular part, is filled with the white or white colored catalyst paste. a contrasting hue.   4. Combination package according to claims 1 to 3,   characterized in that the colored inert paste consists of polydimethyl-   siloxane with trimethylsilyl end groups with colored pigments and fillers.