Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/0003—Making bridge-work, inlays, implants or the like
  • A61C13/0022—Blanks or green, unfinished dental restoration parts
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/12—Tools for fastening artificial teeth; Holders, clamps, or stands for artificial teeth

Definitions

• the invention relates to a blank holder, according to the preamble of claim 1, as well as a dental milling machine, according to the preamble of claim 15.
• a substantially disk-shaped, flat-cylindrical blank is clamped in a standard clamping holder, which typically enables the inclusion of blanks in the standard size of 98.5 mm in diameter.
• the use of such blanks allows the milling of a variety of dental restoration parts, as can be seen for example from WO 2004/086 999 A1, but requires on the other hand, a considerable removal of material, as must be milled from the solid.
• the invention has for its object to provide a blank holder according to the preamble of claim 1 and a dental milling machine according to the preamble of claim 15, which allows for at least constant quality faster processing.
• a ring-shaped workpiece holder is clamped in a standard clamping holder, which is intended to accommodate standard blanks with a diameter of almost 1 00 mm.
• This is designed in a special way, so that he can keep smaller blanks, for example, 50 or 60mm diameter clamped despite its flat design.
• the inventively smaller blank of, for example, 50mm diameter when realized in ceramics also has a different thermal expansion coefficient than a workpiece holder, which may for example consist of steel or another metal. Due to the approximately half the diameter, however, the path of movement is also halved, which makes it possible to reduce the game here, so that, surprisingly, despite the double storage results in the same or even better leadership accuracy, which the accuracy of the milling works to good.
• the blank which may consist of ceramic, but also, for example, composites, is clamped, and insofar pressure-loaded during the clamping.
• Ceramic on the other hand, is particularly pressure-resistant, at least in comparison to its flexural strength. Therefore, gentle to the material and high pressure during clamping are not critical.
• a flange of the blank can be clamped in the vertical direction and thus locked, wherein the blank is clamped between a support support of the workpiece holder and the clamping device at its flange.
• the support support is designed as an annular circumferential support projection, which extends on the underside of the workpiece holder inwardly away, so there has a smaller diameter than the blank on its outer periphery.
• the tensioning device is preferably designed as a clamping ring, which is sunk in both the workpiece holder and in the blank.
• the blank has on its outer circumference above an undercut whose depth corresponds to the thickness of the clamping ring. About a little less than half of the clamping ring is received in this undercut, and the slightly larger portion of the clamping ring is received in a correspondingly shaped undercut in the workpiece holder, so that the workpiece holder securely guides and stores the clamping device.
• this opens up the possibility of realizing the clamping device and the workpiece holder with a flush surface to form the blank.
• the movement of the cutter or cutters relative to the surface of the blank is therefore not disturbed by projecting parts of the workpiece holder or the clamping device, so that the reprogramming of the CNC machine eliminates the risk that the milling cutter may accidentally get in contact with parts of the workpiece holder ,
• the blank holder comprises two subcomponents, namely a workpiece holder for fixing in the dental milling machine and a blank held by the workpiece holder.
• the workpiece holder and with him from him in terms of its external dimensions decisively embossed blank holder a disc-like basic shape with a diameter of 97 mm to 100 mm, preferably 98 mm to 99 mm, which resembles in the manner described below the basic form, which is known from known manufactured from a uniform processing material blanks.
• the workpiece holder has at a circumferential edge region a clamping flange with a thickness orthogonal to the disk surface of preferably between 9mm and 11 mm for clamping the workpiece holder in the dental milling machine.
• a receiving area for the blank is provided in a blank receptacle according to the invention.
• a clamping device On the workpiece holder and / or on the blank is a clamping device by means of which the blank is fixed in position relative to the workpiece holder in this receiving area.
• a blank holder according to the invention is thus a substitute for a known blank having said outer diameter of 97mm to 100mm and the thickness in the edge region of about 1 0mm.
• the circumferential clamping area on the outside of the blank holder is not formed by the blank to be processed itself, but by the workpiece holder, which is intended reusable.
• This workpiece holder which may be made of metal or plastic, for example, forms a kind of adapter for fixing a contrast smaller blank from the material to be machined as ceramic, plastic or gypsum, which is located in said receiving area.
• the disk-like basic shape of the blank receptacle according to the invention is understood to be greater in the two mutually orthogonal directions of extension of the disk plane by at least a factor of 2, preferably by a factor of 3, than in the third direction orthogonal to the first two directions of extent
• Extension direction Such a shape may also be referred to as flat cylindrical.
• the outer contour of the workpiece holder is formed substantially circular, with interruptions in this circular form are considered harmless if the clamping in the also round clamping device of the dental milling remains possible and the outer diameter of maximum 100 mm is not exceeded
• the workpiece holder has an orientation aid which fixes the rotational position relative to the clamping holder of the milling machine.
• This may be designed in any suitable manner, e.g. as a projection, as a groove, as a flattening, or as any other shape that deviates from the circular shape, on the outer circumference of the workpiece holder, with a corresponding counter-shape on the Einspannhalteert.
• the blank preferably has a rotation for determining the relative rotational position of the blank to the workpiece holder.
• This can be designed in the same way as the orientation aid. Both serve as torsion protection and also facilitate the reponability in the milling machine.
• the height of the workpiece holder in the region of the clamping edge is, as already mentioned, preferably between 9 mm and 11 mm, preferably exactly 1 mm, the usual manufacturing tolerances being taken into account.
• the overall height of the workpiece holder could also be larger, for example, to accommodate a blank of greater thickness.
• the receiving area for the blank is provided.
• the blank is held with said clamping device in a preferably defined position relative to the workpiece holder.
• the clamping device comprises on the side of the workpiece holder preferably opposite to the edge region displaceable components which are displaced for the purpose of inserting a blank relative to the receiving area in order to be moved after insertion of the blank with this in contact.
• a design considered advantageous for fixing the blank provides that the workpiece holder has a relative to the edge region of the workpiece holder movable and fixed to the edge region fixable fixing frame as a clamping device which fixes the blank circumferentially in holding areas.
• a single frame is preferably provided guided guided relative to the edge regions of the workpiece holder, which ensures in conjunction with mating surfaces, but otherwise alone, the determination of the blank. It may, for example, be a pivotable frame, which is pivoted in such a way after inserting the molded article into a defined position that it fixes it circumferentially, with circumferential fixation in this context not necessarily continuous
• the frame preferably has a recess through which the processing of the blank remains possible.
• the workpiece holder has a support surface in the receiving area, which may be a completely closed support surface, which thus allows access to the blank by means of the milling tool only from one side. However, it may be an interrupted support surface. Furthermore, according to this further development, the workpiece holder has displaceable fixing means, by means of which the blank resting on the bearing surface is pressed against it.
• the support surface may in particular include the positioning means that it needs to ensure the positional stability of the blank during processing.
• This blank may already be advantageously adapted to the shape of a dental jaw model or quadrant model to be produced by having a convex, in particular approximately semicircular or quarter-circular, outer contour in the main extension plane of the blank receptacle.
• a gap is preferably provided, into which a milling tool can enter. This gap should have an average width of at least 3 mm to 5 mm. It allows, without previous removal of material, the surround the model to be created, faster and with less wear in terms of the tool with the production of the actual outer contour of the dental model to begin.
• the tensioning device comprises a plurality of connecting bridges in the manner of bridges which extend from the workpiece holder to the blank.
• Such bridges hardly limit the free accessibility of the blank by the milling tool.
• three or four bridges are sufficient to adequately fix a blank intended for use in a blank holder according to the invention.
• connecting webs are firmly connected to the blank and that receptacles or other fastening means for distal ends of the connecting webs are provided on the workpiece holder.
• discrete connecting webs extend from the blank substantially radially outward, which are fixed to the edge of the receiving space of the workpiece holder.
• These connecting webs may preferably consist of the material to be processed of the blank, for example plaster, ceramic or plastic.
• the ends of these connecting webs are fastened to the workpiece holder, wherein in the simplest case, a purely non-positively acting plug-in system can be used. But it is also possible, for example, to fix the distal ends of the connecting webs form fit or by a clamping or screwing mechanism on the workpiece holder.
• the connecting webs can also be primarily assigned to the workpiece holder and in this case movably guided on this. They are preferably displaceable so that they can be brought into a holding position in which they hold the blank safely.
• the displaceability of the connecting webs may preferably be purely translational, so that they are movable parallel to the disk plane and preferably approximately in the radial direction, wherein they reach the said holding position at their radially inwardly pointing end position.
• the invention relates to a set of a dental milling machine and a blank holder or a workpiece holder, wherein the blank holder or the workpiece holder are formed in the manner described and wherein a Einspannhalter the dental milling machine by a receptacle with an inner diameter between 97 mm and 102 mm is designed to fix the workpiece holder.
• the clamping holder of the milling machine and the workpiece holder are provided with orientation means, which allows a proper fixation of the workpiece holder only in a limited number of relative positions.
• it is only one or two relative positioning, in which the intended fixation of the workpiece holder to the Einspannehalter is possible.
• an extension provided on the workpiece holder or a recess provided on the workpiece holder can cooperate with a corresponding recess or a corresponding projection on the clamping device in the aforementioned manner. If the relative position of the blank to the workpiece holder is precisely defined by the configuration of the blank holder and the relative positioning of the workpiece holder and the clamping holder of the dental milling machine is only possible in one or a few defined positions, then the milling system can be used without separate checking correct alignment of the blank receptacle assume that the blank is located at its expected position.
• Fig. 1 is a schematic perspective view of an embodiment of a blank holder according to the invention, in exploded view.
• Fig. 3a shows a section through the blank receptacle according to FIGS. 1 and 2-.
• Fig. 3b is an enlarged view of a detail of Fig. 3a.
• Fig. 4 is a schematic view of another embodiment of a Rohlingability- invention. 5a to 5d different embodiments of blank receptacles using formed as a blank blanks.
• the blank holder 10 has two main components, namely a workpiece holder 20 and a blank 1 00.
• the workpiece holder 20 has a disc-shaped basic shape with a special Au DTform on.
• the outer shape is basically circular.
• a clamping flange 22 is projecting mounted, and the workpiece holder has a substantially flat circular cylindrical shape.
• the outer diameter of the workpiece holder 20 outside the clamping flange is 98.5 mm in the exemplary embodiment shown, so that the workpiece holder 20 is suitable for clamping into standard clamping holders of typical dental milling machines.
• the clamping flange 22 is mounted slightly projecting, and the storage is such that even with purely axial application of force by the Einspannhalter secure storage in the dental milling machine is possible.
• the workpiece holder 20 and the blank 100 have a thickness of 10 mm. This value corresponds to the thickness of known blanks with the outside diameter of 98.5mm.
• the workpiece holder 20 may be made of different materials. For example, it can be made entirely of metal. Alternatively, only the clamping flange 22 is metallic, so that the clamping forces can be taken permanently unscathed, while the remaining workpiece holder can be injection molded from injection-molded plastic to the clamping flange.
• the blank 100 has a significantly smaller outer diameter than the workpiece holder 20.
• the blank 100 may be made of any material to be processed by means of dental milling machines. These include primarily the various dental ceramics, but also composites or plastics such as PMMA and PU, as well as gypsum for model production.
• the workpiece holder has a support projection 27 on its inner circumference. which protrudes inwardly and the support of the blank 100 is used.
• the blank 100 on its underside au Shen an undercut 29, which is formed circumferentially and to the support projection 27 fits.
• the blank 100 also has outside on its upper side an undercut 31. which corresponds in shape to the undercut 29 and is also formed circumferentially.
• the workpiece holder 20 also has on its upper side a recess 33. which is shaped in a special way and a clamping device 35 receives, which extends radially inwardly into the undercut 31 of the blank 1 00 and fills them.
• the undercut 31 and the recess 33 are completely filled by the clamping device 35. Since these parts are substantially equal in height, arises when mounted jig 35, a flat surface of blank 1 00 and workpiece holder 20th
• holes 39 for receiving bolts 41 are provided at holding areas. These are screwed into corresponding blind-threaded holes 43 in the workpiece holder 20 and hold the jig 35 securely fixed, which then holds the blank 100 safely and leads.
• Fig. 3a From Fig. 3a it can be seen that the blank 1 00 and the workpiece holder 20 are clamped almost equal in height and disc-shaped.
• the clamping flange 22 of the workpiece holder 20 is fixed by a standard Einspannhalter 50 of the milling machine.
• the clamping device 35 is annular and is pressed by the tightening torque of the bolt 41 down so that the blank 1 00 taken at its edge flange 52 and clamped.
• FIG. 3b is an enlarged view of the storage of the blank 100 to the workpiece holder 20 can be seen.
• the blank 100 rests with its edge flange 52 on the support projection 27.
• the support projection extends radially inwardly toward the workpiece holder 20.
• the clamping device 35 presses from above on the edge flange 52. It is also mounted on the bolt holder 41 on the workpiece holder 20.
• the recess 33 is slightly deeper than the undercut 31st As a result, the desired clamping effect is generated via the bolts 41 on the edge flange 52 of the blank 100, wherein at the same time the depth of the recess 33 forms a stop and limits the clamping force.
• a recess 26 is provided in the region surrounding the edge region of the workpiece holder 20, which recess provides a receiving region 26 for a blank 100 to be processed.
• a circumferential gap 50 is provided between inner surfaces 28 of the workpiece holder 20 and the blank 100, which ensures the immersion of a milling tool from above and with appropriate design of the fastening means for fixing the blank 100 from below.
• the use of the workpiece holder 20, which is a kind of adapter, can be made from a considerably smaller blank 100 for dental models of pines and jaw quadrants, for the production of which a blank receptacle 10 according to the invention primarily serves, without any major changes for the dental Milling machine brings with it.
• the accessibility of the approximately semicircular blank 100 in the case of FIG. 4 also makes possible a faster and less tool-requiring machining from the side.
• an orientation aid 24a is provided, which cooperates with a not shown receiving a dental milling machine to the effect that only in one or a limited number, preferably less than 10 of orientations, the insertion of the workpiece holder 20 in the dental milling machine is possible.
• the orientation aid 24a can be designed both as a depression and as a survey.
• models for use in an articulator are the primary application of a blank holder according to the invention.
• the receiving space 26 has a size in the main extension plane of the blank holder 10, in the in Figs. 5a to 5d illustrated manner, the inclusion of a jaw shape corresponding semicircular blank or at least the recording of a quadrant of a jaw corresponding quarter-circle-shaped blank allows.
• the blank 100 is a material to be processed by means of dental milling machines.
• plastics such as PU and PMMA come into question here.
• Figures 5a and 5b illustrate possible shapes for a blank 100 that may serve to make a model of an entire jaw.
• FIGS. 5a to 5d illustrate that both a semicircular shape or quarter-arch shape of a blank and an approximately semicircular shape or quarter-circle shape of a blank 1 00 may be appropriate.
• the figures mentioned further illustrate that an at least partially adapted to the outer shape of the blank 1 00 shape of the receiving area 26 may be advantageous u.a. to intuitively facilitate the correct orientation of the blank 100.
• FIG. 6 In the case of the embodiment of FIG. 6 are provided as an integral part of the blank with this firmly connected connecting webs 102, which extend to the surrounding the receiving space 26 edge of the workpiece holder 20. These connecting webs extend into recesses 30 in the inner edge 28, which already allow a rough positioning of the blank 100. The complete backup is then carried out by means of screws 32, which are guided by not shown holes in the connecting webs 102 into threads in the recesses 30.
• the blank 100 is also provided with outwardly extending connecting webs 102.
• these are not individually fixed by means of screws, but by a common plate-like frame 35, which is detachable or movable part of the workpiece holder 20 and the blank 1 00 fixed after insertion of the connecting webs 102 in the recesses.
• the frame 35 in turn could also be secured with screws, not shown, or with a rapping mechanism. Since the frame 35 is formed in the illustrated design as a plate, it limits the accessibility of a milling tool to the reference to FIG. 4 lower side of the blank holder. However, it could also have recesses to maintain bilateral accessibility. This is indicated by dashed lines.
• connecting webs 40 are provided for fixing.
• these are translationally movable and by knurled wheels 42 each individually or alternatively displaceable by a common thumbwheel.
• these connecting webs 40 Fixierspitzen 40a. which can retract into cavities 104 provided on the blank 100 in order to effect an accurate positioning of the blank 1 00.
• the workpiece holder 20 has a bearing surface 44 in the receiving region 26, on which stops 46 are provided. This allows accurate positioning of the blank 100 already by inserting it into the receiving area 26. In order that the blank 100 can not unintentionally slip out of the receiving area 26, clamping clips 48 are provided, which force it from above and press it against the bearing surface 42.

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• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Dentistry (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

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Cited By (23)

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Citations (8)

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• 2012
  • 2012-02-06 DE DE102012201744A patent/DE102012201744A1/de not_active Ceased
• 2013
  • 2013-02-05 WO PCT/EP2013/052237 patent/WO2013117540A1/fr not_active Ceased

Patent Citations (8)

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