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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
  • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
  • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers

Definitions

• the present invention relates to a holding device for clamping structures for dental implants to edit the structures in a Zahnfrässystem, with a base body and at least one clamping element.
• a construction or abutment is to be understood in the broadest sense as a connecting element between a tooth implant, which is inserted into the jawbone of a patient, and a dental prosthesis.
• a structure to be machined is clamped in a holding device, which is then inserted into the dental milling system.
• CNC-controlled the abutment is machined to obtain the desired shape.
• the clamping in the holding device is usually carried out at one end of the cylindrical structure, wherein in a subsequent step then the interface for connection to a dental implant is produced. Since there is no standard interface between the abutment and the dental implant, different interfaces to dental implants exist depending on the manufacturer. In this context, interface means the hole provided on the tooth implant with corresponding rotation or anti-rotation elements. Different manufacturers of dental implants have different interfaces, so that a structure is typically connectable only to one type of dental implant.
• a support element is provided, that the clamping element has a plurality of implant analogs that form a tooth implant comparable interface for connection to a structure, so that the structures with a corresponding Interface are attached to an implant analog, and that the support element has recesses, which are designed for receiving and supporting an end portion of a structure.
• the holding device provides interfaces that correspond to the desired tooth-implant interfaces.
• the structures are already provided with the desired interface, so that the structure in the holding device can be connected in the same manner as with a tooth implant inserted in the jawbone.
• the advantage of the subsequent processing of the structure in the holding device is that a much higher accuracy can be achieved because the Relative position to the interface and the surface to be machined surface of the structure is known exactly.
• the structure is supported and held on its two longitudinal sides, so that the position during processing in the dental milling system can not change.
• the use of implant analogs in the clamping element and the support element allow the realization of a holding device that can record accurately fits and this safely supported during processing in the dental milling system, so that a very high accuracy can be achieved.
• the abutments already have preconfigured interfaces, which then interact with an implant analog in the clamping element, the alignment between the interface and the section to be machined by the dental milling system is very easy to detect, so that a high precision is possible.
• This accuracy is of great importance precisely when the shape of the structure to be milled is not rotationally symmetrical and the interface between tooth implant and abutment permits, for example, only a few connection positions. In other words, it is very important that the section machined by the dental milling system, to which the denture is to be applied, later fits exactly to the interface.
• the clamping element is detachably connected to the base body.
• clamping element can be adapted very quickly to different interfaces.
• the clamping element can for example be detached from the base body and replaced by another clamping element for another type of interface. Only a relatively small component of the holding device must therefore be replaced, which represents a significant improvement over a designed only for an interface type holding device.
• the recesses in the support element each have an indexing.
• the recesses into which an end portion of a structure is received have at least one design feature that is designed to accommodate this end portion and thus the entire structure only in a rotational position.
• An exact rotational position is therefore of great importance for the subsequent machining of the structure in the dental milling system, since the connection between the abutment and the tooth implant is typically provided with a rotation lock via the described interface, so that the structure is only in a few rotational positions in the tooth implant can be used.
• At least two fitting holes and at the base body at least two dowel pins are provided on the clamping element to accurately position the clamping element on the base body on the clamping element.
• the base body is disc-shaped and has a rechteckförmi- gene centrally arranged cutout, which is separated by the support symmetrically in two rectangular cutouts.
• a locking element is provided, which is placed on the support member and connectable to this, to fix the end portion of a structure in the recess.
• the object underlying the invention is also achieved by a set consisting of a holding device according to the invention and at least one structure to be machined, wherein the structure has a first, a second and a third longitudinal section, wherein the first longitudinal section a to a tooth Implant adapted interface and the third longitudinal section is designed as a pin for receiving in the recess in the support element and the second longitudinal section is to edit.
• journal has a flattening, which serves as an inversion.
• Fig. 1 is a perspective view of a holding device according to the invention
• FIG. 2 is a perspective view of a detail of the holding device according to the invention with recorded structures.
• FIG. 4 is a perspective view of a structure
• Fig. 5 is a perspective view of a dental implant analog
• Fig. 6 is a perspective sectional view of a clamping element.
• a holding device is shown in a perspective view and designated by the reference numeral 10.
• the holding device 10 serves to receive tooth-implant abutments (also referred to as abutments) in order to be able to machine them in a dental milling system.
• a tooth-implant abutment is that part which is connected, on the one hand, to the tooth implant inserted in the jawbone of a patient and, on the other hand, to the denture.
• a tooth-implant assembly is connected by screw with the tooth implant. Since dental implant abutments are well known, this will not be discussed further here.
• the holding device 10 has a base body 12 which has a circular shape in plan view.
• the main body 12 has, for example, three longitudinal sections with different diameters 13. 1, 13. 2 and 13. 3, the first longitudinal section 13. 1 having the largest diameter, the second longitudinal section 13 smaller diameter and the subsequent third longitudinal section 13.3 again has a smaller diameter.
• the individual longitudinal sections of the main body 12 are concentric with each other and formed in one piece. It should be noted, however, that the outer contour of the body can be arbitrary and significantly depends on the used Zahnfrässystem.
• FIG. 1 shows the upper longitudinal section 13.1, which in the circumferential direction has two or more, for example six holes 14, which are distributed uniformly in the circumferential direction and which are preferably centered to a central axis of the main body. These holes 14 are provided in each outer region of the first longitudinal section 13.1, which is not covered by the subsequent longitudinal section 13.2. About these holes 14, the holding device 10 can be secured in a dental milling system by means of centering.
• the main body 12 has two cutouts 16.1, 16.2, which are arranged symmetrically within the circular area of the main body 12.
• the two cutouts 16 have the same dimensions and extend through all three longitudinal sections 13.1, 13.2, 13.3.
• the cutouts are thus open at the top and bottom, so that a milling tool later in the machining of the structures from both sides, ie from above and below, can achieve.
• the two cutouts 16.1, 16.2 are separated from one another by a web 18, this web serving as a support element 20.
• the web 18 is preferably formed integrally with the base body 12, but could alternatively be provided as a separate component and connected to the base body.
• the dimension of a section 16 depends essentially on the number of recorded structures and their size.
• the width B of a cutout 16 is chosen to be greater than the length of the section of a structure to be machined.
• the length L of a cutout 16 is selected so that preferably three or more structures fit next to one another.
• a rectangular recess 24 is provided in the base body 12 on the outer longitudinal sides 22 of the cutouts 16, which is formed open edge to the cutout 16.
• the clamping element 26 has a nearly rectangular cross-section with only one bevel 28.
• a web 18 facing the planar surface 30 of the clamping element 26 has in the present embodiment, three holes 32 which are equally spaced from each other are provided. These holes 32 are designed so that they can accommodate a so-called tooth-implant analog.
• a dental implant analog is an element that is designed like a "true" dental implant, particularly with respect to the interface to a structure.
• Such dental implant analogs are commercially available components that are used in the laboratory for the production of dental prostheses.
• the fixation of the tooth-implant analogues in the respective bore 32 is preferably carried out via screws, which can be screwed from above into a bore 34 and clamp the tooth-implant analog with it.
• the bore 34 is perpendicular to the bore 32 and opens into it.
• the two clamping elements 26 are designed as interchangeable components. They are inserted into the recesses 24 and connected via corresponding screws 36 fixed to the main body 12. For better positioning could additionally pass holes and dowel pins may be provided, so for example two dowel pins per recess 24 in the base body 12 and two correspondingly provided fitting holes in a respective clamping element 26, so that when inserting the clamping elements 26 in the recesses 24 easily the correct position is found ,
• these could also be constructed, for example, in two parts, with a lower and an upper body.
• the tooth-implant analogs could then, instead of being inserted into holes, be inserted into one of the two bodies and clamped by placing and connecting the other body.
• the bores 32 are opposite in the web 18 recesses 40 are provided, which are formed edge open upwards.
• a cover 42 is provided, which can be preferably connected by screws to the web 18.
• the cover member 42 is configured such that at least the recesses 40 are covered at the top.
• web 18 and cover 42 are dimensioned together so that the cover 42 does not protrude beyond the upper level of the body 12. This can be clearly seen in particular in FIG. 3b.
• the recesses 40 serve to receive pin-shaped end portions of structures. In other words, that the cone-shaped cut from above into the open-edged recess 40 can be inserted.
• the cover 42 By subsequent application of the cover 42 then the zapfenformige section - except in the longitudinal direction - firmly clamped. Characterized in that the zapfenformige section projects slightly above the edge of the web 18, the zapfenformige section can be clamped during application of the cover.
• FIG. 4 shows by way of example an embodiment of a construction or abutment as a blank prior to its machining in a dental milling system and designated by the reference numeral 50.
• the preferably made of dental-grade plastic or metal, in particular titanium, constructed structure 50 is divided into three longitudinal sections 52.1, 52.2 and 52.3, wherein the first longitudinal section 52.1 carries the interface 54 to a tooth implant.
• This interface 54 is adapted to a particular tooth-implant type, it being noted at this point that different tooth-implant manufacturers use different interfaces.
• the interface 54 on the structure 50 carries differently configured surfaces, which on the one hand ensure a rotation or rotational security and on the other act as indexing to allow the introduction of the structure in a dental implant only in one or a few positions.
• the structure itself has a continuous longitudinal bore with different diameters, so that a non-illustrated stage is formed within the bore.
• the structure by means of a screw can be fixed, which at least passes through the first longitudinal section 52.1 and in the tooth-implant analog is screwed. The screw head then rests against the aforementioned step within the bore.
• the second longitudinal section 52.2 is formed in the present embodiment as a cylindrical body, which is then milled in the dental milling system to the desired shape. The dentures will later be applied to this area.
• the third longitudinal section 52.3 is also formed as a cylindrical body, but with a significantly smaller diameter than the second longitudinal section 52.2.
• This peg-shaped section 52.3 is used solely for support in the holding device 10.
• this third longitudinal section 52.3 is tapped.
• the third longitudinal section 52.3 on its peripheral surface on a flattening 56, which must be in a defined geometric relation to the interface 54.
• This preferably provided flattening serves 56 for indexing in the recess 40 in the web 18. That means in other words that the recess 40 has a correspondingly adapted configuration, so that the third longitudinal section 52.3 are inserted only in one position in the recess 40 can. In Fig. 2, this is easy to see.
• the recesses 40 are not symmetrical with respect to the longitudinal axis of the structure.
• the pin-shaped third longitudinal portion 52.3 so designed that it can be introduced only in one position in the recess 40.
• FIG. 1 A structure 50 is inserted with its first longitudinal portion 52. 1 into a tooth-implant-analogue bore 32 in the clamping element 26 and screwed with a screw, which is inserted into the through-hole of the structure, wherein the flat 56 is aligned in the longitudinal direction.
• the clamping element is inserted with the unilaterally clamped structures 50 in the base body 12, wherein the peg-shaped portions of the structures indexed via the flats into the recesses 40 in the web 18 pass. Then, the cover 42 is placed and screwed and the clamping element 26 is screwed to the base 12.
• the building blanks 50 are now on the one hand stably connected to the base body 12 and on the other hand defined held in position.
• the abutments 50 are aligned over the flattening 56 exactly to a reference point necessary for the dental milling system on the holding device 10. Since the abutments 50 are supported at both longitudinal ends in the holding device 10, a Fräsbearbei- tion of the second longitudinal section 52.2 are executed very precisely, since no or only small vibrations during processing arise.
• a dental implant analog 60 and a cut clamp 26 with a dental implant analog 60 are shown.
• the inserted into the bore 32 dental implant analog 60 has three longitudinal sections 61 .1 to 61 .3, wherein the first longitudinal section 61 .1 provides the interface 62.
• the rear third longitudinal section 61. 3 has two mutually parallel grooves 64, 65, each forming a flat groove bottom, which is bounded in the longitudinal direction to the longitudinal end by a cheek 70.
• an open-edged recess 68 is introduced in the cheek 70.
• This recess which can also be provided as a bore, serves on the one hand to index the dental implant analog in the bore 32 and on the other hand as an anti-rotation.
• the recess 68 is in a defined geometric relationship to the interface 62, in particular the indexing elements provided there, and thus also to the flattening 56 on the structure 50, when the assembly 50 in a position in the dental implant.
• Analog 60 is introduced.
• the recess 68 cooperates with a pin 66 which is provided in the clamping element and protrudes over a defined length in the bore 32, as can be seen in Fig. 6.
• the pin 66 causes the dental implant analog only in a rotational position can be fully inserted into the bore, otherwise the pin abuts the cheek 70. Since the pin has a certain length, it is easy for the user to recognize whether the dental implant analog is now fully inserted or rotated yet in the correct rotational position and then pushed further.
• the dental implant analog can be clamped by means of a screw which is screwed into the bore 34.
• the screw contacts the flat groove base of the groove 65.
• the dental implant analog 60 is secured both in the rotational and in the translational direction.
• a tool is provided with the holding device 10 according to the invention, which allows simple, flexible and cost-effective machining of structures.
• the clamped in the fixture structures are already preconfigured with an interface 54, so that their training does not - as before - after the processing of the second longitudinal section 52.2 has to be done.
• the preconfigured interface facilitates the introduction or connection to the main body 12 of the holding device 10, and on the other hand permits a more exact processing of the second longitudinal section 52.2 with respect to the interface, that is to say the surfaces provided there for rotational security.

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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 Prosthetics (AREA)

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Citations (8)

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• 2012
  • 2012-03-12 DE DE102012102059A patent/DE102012102059B4/de active Active
• 2013
  • 2013-03-12 WO PCT/EP2013/054986 patent/WO2013135687A1/fr not_active Ceased

Patent Citations (8)

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