Flat, plate-shaped paste module made of at least one reactive-curable paste-like molding compound, particularly for use in the dental sector

Abstract

Flat, plate-shaped paste module with a first side, also called front side, and an opposite second side, also called back side, as well as a circumferential edge connecting the first and the second side, comprising at least one pasty, reactive-curable molding compound containing at least one compound having at least one acrylate and / or methacrylate group, and at least one filler, wherein at least one weakened region with a longitudinal orientation extends over the first side and / or over the second side, wherein the weakened area with the longitudinal orientation allows the separation of the module into at least one shaped part in strand form, whereby all weakened areas with longitudinal orientation extend from one edge area of ​​the module to the opposite edge area of ​​the module, wherein all weakened areas are arranged with longitudinal orientation in such a way that they do not cross each other and wherein at least one weakened region with longitudinal orientation in cross-section has at least in sections the shape of a triangle, rectangle, square, semicircle, circular section, semi-ellipse, elliptical section or polygon or that at least one weakened region with longitudinal orientation represents a slit-shaped notch.

Description

The present invention relates to flat plate-shaped paste modules.Pasty photocurable plastic compositions or molding compositions for the dental sector are known. The pasty plastics or molding compositions are generally present in strand form. Such pasty photocurable plastic compositions present in strand form are used, for example, for the production of dental denture splints. By way of example, reference is made to the disclosure of DE 102 24 002 B4, according to which it is important that a strand made of such a pasty light-curing plastic or molding compound has a cross-sectional shape which is either circular, semicircular, oval-shaped, polygonal with three or more corners, diamond-shaped, trapezoidal or crescent-shaped. In order to be able to ensure trouble-free use, in particular even after prolonged storage, such pasty photocurable strand materials must be packaged, transported and stored with exclusion of light. Otherwise, premature curing takes place, as a result of which these strands can no longer be used as intended. In order to be able to ensure trouble-free use, these strands are therefore regularly packed individually in a light-tight manner into separate containers immediately after their production. This is very laborious and cost-intensive. Moreover, the light-tight package does not unduly contribute to the overall cost. For example, for this purpose, use is made of plastic containers equipped with a film hinge, into which the pasty strand is fitted in the correct shape.DE 20 2007 001 275 U1 discloses an apparatus for storing and removing viscous pastes, which has a main part with a trough for receiving a strand of viscous paste and a first cover, which is mounted on the main part and covers the strand and is movable into a position in which one end of the strand is exposed, in particular for dental purposes. Such a device is characterized in that the device and the depression are circular, that the first cover is rotatably mounted on the main part and has an opening in the region of the depression, and that a second cover is provided which is rotatably mounted on the first cover and has an opening which can be aligned with the opening of the first cover, wherein the depression and the openings are arranged in the circumferential region of the device. Such a device is intended to prevent that too much of the strand of the paste is exposed when removing paste.US 2004 / 0209975 A1 addresses an intraoral or extraoral dental restoration material comprising a polymeric matrix and a filler component, wherein the filler component comprises a first plurality of particles having an average particle size of about 1 to about 10 micrometers, a second plurality of particles having an average particle size of about 0.1 to about 1 micrometer, and a plurality of filler particles having an average particle size of about 0.01 to about 0.04 micrometers. Such a material should be packable.It is an object of the present invention to make available pasty light-curing plastic or molding compounds for the dental sector and, in particular, dosage forms for pasty light-curing plastic or molding compounds for the dental sector, which can be packaged and handled without particular effort and nevertheless make it possible for the user to always resort to fresh molding material for the formation of, for example, dental denture splints.Accordingly, we have found a sheet-like paste module having a first side, also referred to as front side, and an opposite second side, also referred to as rear side, and a circumferential edge connecting the first and second sides, comprising at least one pasty reactive-curable molding compound comprising at least one compound having at least one acrylate and / or methacrylate group, and at least one filler, wherein at least one weakening region having a longitudinal orientation extends over the first side and / or over the second side.The weakened regions with longitudinal orientation enable a reliable and simple separation of the module into at least one molded part in strand form, in particular into a plurality of molded parts in strand form.The pasty reactive-curable molding composition is reactive-curing or curable in the sense of the invention if it changes from a pasty consistency to a cured consistency by means of thermal energy and / or electromagnetic radiation, in particular in the visible and / or microwave range. The curing process is regularly attributed here to crosslinking and / or polymerization reactions. A reactive-curable molding composition in the context of the invention does not also comprise molding compositions which cure exclusively by virtue of the liquid or volatile constituents present in these molding compositions escaping. The curing process gives polymeric moldings from the reactive-curable molding compositions.As a flat plate-shaped paste module, this generally has a thickness which is less than its length and width extension. The circumferential edge of the paste module generally corresponds substantially to the thickness of the paste module, but can also deviate therefrom. For example, it is possible for the edge to be sectionally or completely wider or narrower than the thickness of the paste module. In these cases, the thickness of the paste module increases or decreases toward the edge. In one embodiment, it is also possible for the edge to assume a substantially linear extent in sections or completely substantially. This is the case, for example, when the first and the second side of the paste module run towards each other at an angle towards the edge.In a particularly expedient configuration, the thickness of the paste module is substantially constant, apart from the weakened regions with longitudinal orientation.According to the invention, all weakened regions with longitudinal orientation extend from one edge of the module to the opposite edge of the module.The first side and the second side of the paste module according to the invention have, in a particularly practicable embodiment, an essentially rectangular or square basic shape.In the case of a rectangular basic shape of the first and second sides, the weakened regions with longitudinal orientation preferably run substantially along the longitudinal axis substantially parallel to the longitudinal axis of the rectangular basic shape. Alternatively, they can also run substantially transversely to the longitudinal axis.A weakened region with longitudinal orientation in the sense of the present invention usually has a longitudinal extent which is greater than its width extent. In one embodiment, the weakened region can be formed continuously in its longitudinal orientation, but it can also be formed from a plurality of successive weakened points or weakened areas which are spaced apart from one another and only form a longitudinal orientation overall. These points of weakness or areas of weakness do not necessarily themselves have to have a longitudinal orientation and can have a square or circular basic shape, for example.The weakened regions with longitudinal orientation can assume a variety of cross-sectional shapes. These are, for example, grooves or trenches which extend with a longitudinal orientation over the first or second side of the paste module according to the invention. The weakened areas with longitudinal orientation usually have the characteristic that the mechanical stability along these areas is weaker than in the respectively adjacent areas of the paste module which do not have such weakened areas. Such lower mechanical stability may be produced, for example, by a reduced thickness. Alternatively, it is possible to provide a material in the region of the weakened regions with longitudinal orientation which contributes less to the mechanical stability of the paste module than that of the material which is respectively present next to these weakened regions and forms the paste module predominantly.The weakened regions with longitudinal orientation are preferably substantially rectilinear. It is also possible, however, to provide weakened regions with longitudinal orientation with a curved, for example wave-shaped, course. The shape of the weakened areas with longitudinal orientation should be expediently selected in such a way that, when the paste module is separated along these weakened areas with longitudinal orientation, a strand of pasty reactive-curable, in particular light-curable, material is obtained.According to the invention, it is provided that all weakened regions with longitudinal orientation are arranged in such a way that they do not cross one another, in particular run substantially parallel.According to the invention, it is provided that at least one weakening region with longitudinal orientation has, in cross section, at least in sections, the shape of a triangle, rectangle, square, semicircle, circle section, half ellipse, ellipse section or polygon, in particular 5, 6 or 7 corner, or that at least one weakening region with longitudinal orientation represents a slot-shaped notch. This cross section of the weakened region with longitudinal orientation can either have no material, so that the paste module has a smaller thickness at this point, or this cross section can be filled completely or partially with a material with lower mechanical stability than the pasty reactive-curable, in particular photocurable material.In one embodiment, it is provided that the extent of the weakened region with longitudinal orientation in the direction from the first side to the opposite second side or in the direction from the second side to the opposite first side constitutes at least one quarter, in particular at least one third and preferably at least half, of the thickness of the module.If weakening regions with longitudinal orientation are present on the first side and on the second side, these have a substantially congruent course at least in sections. Embodiments in which the weakened regions with longitudinal orientation present on the first side and on the second side are substantially completely congruent over their entire course are particularly suitable.Also, those paste modules have proven to be particularly suitable in which the weakened region with longitudinal orientation has a cross-sectional shape which, after separation along this weakened region, produces a strand with a cross-section which is not circular, semicircular, oval-shaped, polygonal, with three or more corners, diamond-shaped, trapezoidal and crescent-shaped.The paste module may have an average thickness in the range of 6 to 16 mm and an average length in the range of 9 to 15 cm.Furthermore, adjacent weakening regions with longitudinal orientation can have an average distance in the range of 8 to 12 mm.In a further embodiment, it may be provided that the paste module according to the invention comprises a pasty reactive-curable, in particular photocurable, molding compound comprising at least one compound having at least one acrylate group and / or having acrylate group in an amount of 2 to 99% by weight, at least one initiator in an amount of 0.1 to 7% by weight, and at least one filler in an amount of 2 to 85% by weight, and optionally further modifiers.It is also possible for the pasty reactive-curable, in particular photocurable, molding composition to further comprise from 0.01 to 5% by weight of at least one co-initiator.In a further expedient configuration, the paste module according to the invention comprises a pasty reactive-curable, in particular photocurable, molding composition which comprises, as further modifiers, at least one dye, at least one pigment, at least one polymeric thickener and / or at least one stabilizer.Those paste modules in which the pasty reactive-curable, in particular photocurable, molding compound has at least two different compounds containing acrylate and / or methacrylate groups have also proven to be particularly suitable.Also particularly advantageous are those paste modules according to the invention in which the paste-like reactive-curable, in particular photocurable, molding compound comprises at least two different fillers.Pasty molding compositions for the purposes of the invention are generally those with a consistency that can be modeled at room temperature, in particular for dental applications, i.e. the viscosity of these molding compositions is such that they are sufficiently dimensionally stable at room temperature to be transported and stored and that they are simultaneously capable of being modeled under the action of force.At least one paste module according to the invention can be present in a packaging, in particular light-tight packaging.In this case, in a suitable embodiment, it can be provided that the packaging comprises a packaging container, in particular in the form of a can, containing a receiving box containing the at least one paste module, and a casing into which the receiving box can be reversibly introduced, in particular with the formation of a light-tight packaging.Embodiments of this kind also embody the packaging in which the wrapper has an insertion opening and, if appropriate, a discharge opening for the receiving box separate therefrom, wherein the cross-sectional shape of the insertion opening and / or discharge opening substantially corresponds to the cross-sectional shape of the receiving box.Such packages have proven particularly expedient in which the insertion opening and / or the discharge opening are or are each fastened, completely or partially covered or coverable by at least one pivotable panel, preferably on the casing, in particular in the region of the insertion opening or discharge opening.In this case, the pivotable panel is preferably configured and designed in such a way that it has the tendency to fold back in the direction of the insertion opening or discharge opening in the partially or completely deployed state away from the insertion opening or discharge opening.Suitable packages can likewise have at least one, in particular foldable, cutting device, in particular attached to the wrapper, for separating at least one strand from the paste module in the package, in particular the receiving box.The compound or compounds in the pasty molding composition, which have the acrylate and / or methacrylate groups, cure or cure by polymerization and / or crosslinking reactions, in particular as a result of the presence of a suitable initiator and / or as a result of the irradiation of electromagnetic waves, preferably ultraviolet and / or visible light in the wavelength range from 250 to 700 nm, preferably 320 to 500 nm. Suitable acrylates or methacrylates are, for example, the following crosslinkable and noncrosslinkable mono-, di-, tri- and hexafunctional acrylates or methacrylates, which are used alone or in combination: aliphatic and / or aromatic urethane (meth)acrylates, aliphatic and / or aromatic urethane di(meth)acrylates, aliphatic and / or aromatic urethane tri(meth)acrylates, aliphatic and / or aromatic hexafunctional urethane (meth)acrylates, aliphatic diurethane di(meth)acrylate, tetraethoxylated bisphenol A di(meth)acrylate, 2-hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, butyl methacrylate, 2-ethylhexyl (meth)acrylate, methacrylic esters having an ester group of in particular 1 to 13 C atoms, isobornyl (meth)acrylate, benzyl (meth)acrylate, Cyclohexyl (meth)acrylate, n-hexyl (meth)acrylate, ethyltriglycol (meth)acrylate, Tetrahydrofurfuryl(meth)acrylat hydroxyalkyl (meth)acrylates having an alkyl group of in particular 1 to 4 C atoms, such as, for example, 2-hydroxyethyl (meth)acrylate, alkoxyethyl (meth)acrylate having an alkoxy group of in particular 1 to 4 C atoms, allyl (meth)acrylate, ethylene glycol di(meth)acrylate, diethylglycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, aromatic dimethacrylates (for example iso-bis-GMA, bis-EMA, bis-PMA), aliphatic polyethylene glycol dimethacrylates (for example polyethylene glycol 400-DMA), 1,3-Butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, Dipropylenglycoldi(meth)acrylat Tripropylenglycoldi(meth)acrylat Tetraethylenglycoldi(meth)acrylat trimethylolpropane tri(meth)acrylate, 1,12-dodecanediol di(meth)acrylate, glycerol 1,3-di(meth)acrylate and / or trimethylolpropane trimethyl(meth)acrylate.Suitable initiators for the curing are, for example, phosphine oxides such as diphenyl-2,4,6-trimethylbenzoylphosphine oxide, benzoin and benzoin ethers such as benzoin alkyl ethers, benzil ketals such as benzil dialkyl ketals, acetophenones such as α-hydroxyacetophenone, dialkoxyacetophenone and / or α-aminoacetophenone, benzophenones, thioxanthones such as i-propylthioxanthone, α-dicarbonyl compounds such as camphorquinone, bisimidazoles, metallocenes such as titanocenes and ferrocenes, aryl tert-butyl perester, fluorones such as 5,7-diiodo-3-butoxy-6-fluorones, aryldiazonium salts, arylsulfonium salts, aryliodonium salts, ferrocenium salts and / or phenylphosphonium benzophenone salts. The initiators are used alone or in combination.The optional coinitiator for curing may be one or more of the following compounds: tertiary amines, preferably N,N-dimethyl-p-toluidine, N,N-dihydroxyethyl-p-toluidine, N,N-dialkyl dialkylaniline and other structurally related amines, preferably in combination with initiators such as benzophenones and α-dicarbonyl compounds; diaryliodonium compounds, preferably in combination with fluorene initiators; borates, such as butyrylcholinetriphenylbutyl borate and other structurally related borates; organic phosphites; thioxanthones as sensitizers for the α-aminoacetophenone initiators; xanthenes; fluorenes; fluorones; α-dicarbonyl compounds, such as camphorquinone, for example, as sensitizers for the diaryliodonium initiators.Suitable fillers for the paste modules according to the invention are usually all fillers conventionally used for dental materials. Suitable fillers which can be present in the synthetic resin composition used according to the invention, alone or in combination, are silicon dioxide, such as pyrogenic and amorphous silica, aluminum oxide, titanium oxide, ceramic particles, quartz particles, ground glasses, splitter polymers, such as aromatic and aliphatic urethane dimethacrylates with and without silanized silicon dioxide, silica gels, zeolites, zirconium oxides, zinc oxides, bead polymers based on (meth)acrylic esters, such as PMMA beads, minerals, fibers and / or fabrics, such as, for example, glass fiber, carbon fiber, textile fiber and / or metal fiber. To improve the bond with the other constituents of the composition, the filler may be pretreated with a silane, for example 3-methacryloyloxypropyltrimethoxysilane. The grain sizes of the inorganic and / or organic fillers are usually <400 μm, preferably <200 μm. The length of the fibers is usually <1500 μm, preferably <1000 μm.As optional further modifiers, the molding composition of the invention may further comprise, alone or in combination: dyes, pigments, polymeric thickeners and / or stabilizers. The paste is preferably colourless or can be coloured, for example, tooth-coloured or, for example in the case of pediatric patient goods, in red, green, blue or yellow or mixtures thereof. Examples of stabilizers are: hydroquinone, hydroquinone monomethyl ether, pyrocatechol and / or 2,6-di-tert.-butyl-4-methylphenol.To provide a pasty consistency which ensures accuracy of fit and dimensional stability, the synthetic resin composition preferably contains a combination of at least two different compounds containing acrylate and / or methacrylate groups and / or a combination of at least two different fillers.In the method for producing the module according to the invention, the pasty reactive-curable, in particular photocurable, molding compound described above is provided and the sheet-like plate-like module is subsequently molded in one piece from this molding compound by means of a pressing device. The desired final length of the module can also be obtained by dividing a module of longer shape.The production of the pasty photocurable molding composition from which the modules according to the invention are produced is described in more detail below with reference to the non-limiting examples 1 to 3. In this case, the constituents indicated in the following table (quantitative data in % by weight) were first mixed well with exclusion of air. Subsequently, the compositions were molded into respective plate-shaped paste modules having a length of 12 cm. The dental material in the non-polymerized state had a good pasty and formable consistency, was not too hard or brittle, but on the other hand was not too soft. Table I Table IA. A1,4-Butanediol dimethacrylate18--B. BTetrahydrofurfuryl-2-methacrylate-10-C. CAliphatic diurethane acrylate-2020D. DDiurethane acrylate372920E. ETetraethoxylated bisphenol A dimethacrylate4--F. FCamphorquinone0,20,1-G.Tertiary amine0,20,1-H. H. The reaction temperature is highAcylphosphine oxide1,60,81,0I.Fumed silica41918J. J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. The J. J. J. The J.Splitter polymer351934K. KGlass fibers silanised-22L. LGround glasses silanised-5Further features and advantages of the invention are evident from the following description, in which preferred embodiments of the invention are explained by way of example with reference to schematic drawings. The following are shown: FIG. 1 shows a schematic illustration of a detail of a first embodiment of a paste module according to the invention in a perspective plan view; FIG. 2 shows a cross-sectional view of the paste module according to FIG. 1 ; FIG. 3 shows a cross-sectional view of an individual strand separated from the paste module according to FIG. 1 ; FIG. 4 shows a schematic cross-sectional view of a second embodiment of a paste module according to the invention; FIG. 5 shows a perspective top view of a schematic illustration of a third embodiment of the paste module according to the invention; FIG. 6 shows a perspective top view of a schematic illustration of a fourth embodiment of the paste module according to the invention, and FIG. 7 is a cross-sectional view of the paste module of FIG. 6.FIG. 1 shows a section of the first embodiment of a paste module 1 according to the invention made of a pasty photocurable molding compound. This paste module 1 is equipped with weakening areas 2 and 4 of different configuration running essentially parallel on the first side 6, also called front side for the sake of simplicity, and on the second side 8, also called back side for the sake of simplicity. The weakened regions 2 and 4, also referred to as first and second weakened regions, run substantially linearly in the longitudinal orientation and are arranged congruently, i.e. substantially congruently with one another. By providing such weakened areas in the paste module 1 according to the invention, it is possible in a simple manner for the person skilled in the art to separate individual strands from the units 10 bounded by respectively adjacent weakened areas. This can be done, for example, with the aid of a knife or scalpel. Due to the cross-sectional shape of this first embodiment variant of the paste module 1 according to the invention, as shown in FIG. 2, individual strands 10 having a cross-sectional shape shown in FIG. 3 are obtained in this way.FIG. 4 shows the cross-sectional shape of a further second embodiment variant of the paste module 1 according to the invention. The weakened regions 2 are arranged in this case only on the front side 6, namely in the form of notches or incisions.As shown in FIG. 4, these can extend in one embodiment up to approximately half the thickness of the paste module 1.FIG. 5 shows a third embodiment variant of the paste module 1 according to the invention. in this configuration, the rear side 8 is of planar configuration, and weakened regions 2 are located exclusively on the front side 6.FIG. 6 shows a schematic plan view of a fourth embodiment variant of the paste module 1 according to the invention. Here, the weakened regions 2, as can also be seen from FIG. 6, are present in a triangular cross-sectional shape (see FIG. 7 ). In this embodiment, the weakened regions 2 have an extension in the direction of the rear side 8, which corresponds to approximately half the thickness of the plate-shaped paste module 1.The features of the invention disclosed in the above description, in the claims and in the drawings can be essential for the realisation of the invention in its various embodiments both individually and in any combination.

Claims

Planar, plate-shaped paste module having a first side, also called front side, and an opposite second side, also called rear side, and a circumferential edge connecting the first and the second side, comprising at least one pasty reactive-curable molding compound, containing at least one compound having at least one acrylate and / or methacrylate group, and at least one filler, wherein at least one weakening region having a longitudinal orientation extends over the first side and / or over the second side, wherein the weakening region having the longitudinal orientation allows the module to be separated into at least one molded part in strand form, wherein all weakening regions having the longitudinal orientation extend from an edge region of the module to the opposite edge region of the module, wherein all weakening regions having the longitudinal orientation are arranged in such a way, The object of the invention is to provide a method of producing a weakening film of longitudinal orientation which does not cross each other and at least one weakening region having a longitudinal orientation in cross section at least in sections has the shape of a triangle, rectangle, square, semicircle, cutout, half ellipse, cutout ellipse or polygon, or at least one weakening region having longitudinal orientation is a slit-shaped notch.Paste module according to Claim 1, characterized in that the pasty reactive-curable moulding compound constitutes or comprises a reactive-curable moulding compound which is curable by means of thermal energy and / or electromagnetic radiation.Paste module according to claim 1 or 2, characterised in that all weakened areas with longitudinal orientation are arranged in such a way that they run substantially parallel.Paste module according to any one of the preceding claims, characterized in that the extension of the weakening area with longitudinal orientation in the direction from the first side to the opposite second side or in the direction from the second side to the opposite first side constitutes at least one quarter or at least one third or at least half of the thickness of the module.Paste module according to one of the preceding claims, characterized in that the weakened regions with longitudinal orientation are provided on the first side and on the second side and have a substantially congruent course at least in sections.Paste module according to any one of the preceding claims, characterized in that the weakening area with longitudinal orientation has a cross-sectional shape which, after separation along this weakening area, provides a strand with a cross-section which is non-circular, semicircular, oval-shaped, polygonal, with three or more corners, diamond-shaped, trapezoidal and crescent-shaped.Paste module according to one of the preceding claims, characterized in that the first side and the second side have a substantially rectangular or square basic shape.Paste module according to claim 7, characterised in that in the case of a rectangular basic shape of the first and second side, the weakened regions with longitudinal orientation run substantially along the longitudinal axis substantially parallel to the longitudinal axis of the rectangular basic shape.A paste module according to any preceding claim, characterised in that the module has an average thickness in the range 6 to 16 mm and an average length in the range 9 to 15 cm.Paste module according to one of the preceding claims, characterized in that adjacent weakened regions with longitudinal orientation have an average spacing in the range from 8 to 12 mm.Paste module according to one of the preceding claims, characterized in that the pasty reactive-curable molding composition comprises at least one compound which has at least one acrylate group and / or acrylate group in an amount of 2 to 99% by weight, at least one initiator in an amount of 0.1 to 7% by weight, and at least one filler in an amount of 2 to 85% by weight, and optionally further modifiers.Paste module according to Claim 11, characterized in that the pasty reactive-curable moulding composition further comprises from 0.01 to 5% by weight of at least one co-initiator.Paste module according to Claim 11 or 12, characterized in that the pasty reactive-curable moulding composition comprises, as further modifiers, at least one dye, at least one pigment, at least one polymeric thickener and / or at least one stabilizer.Paste module according to one of the preceding claims, characterized in that the pasty reactive-curable moulding composition has at least two different compounds containing acrylate and / or methacrylate groups.Paste module according to one of the preceding claims, characterized in that the pasty reactive-curable moulding composition comprises at least two different fillers.Paste module according to one of the preceding claims, characterized in that the pasty reactive-curable moulding compound is a photocurable moulding compound.

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